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1

Short-term eddy-covariance measurements of CO2 fluxes at Itaipu Lake, Brazil  

NASA Astrophysics Data System (ADS)

We describe a 5-day campaign of eddy-covariance measurements at Itaipu Lake, in Southern Brazil and estimates of CO2 fluxes over crops in the same region with a SVAT model. Itaipu Lake was formed from the damming of Paraná River at the border between Brazil and Paraguay close to Foz do Iguaçu (BR) and Ciudad del Leste (PY); Itaipu dam is jointly operated by both countries. The measurements were made on the Brazilian side, at a very small island (Lat: -25o 03'25.72" Long -54o 24'33.67" : Altitude: 220 m ASL) located approximately 420 m away from the left (Brazilian) bank. The fetch to the ragged countour of the lake is rather large in the North-South direction: 2891 m to the North, and 1817 m to the South. Eddy covariance instrumentation mounted on a short tower consisted of a Li-Cor LI7500 open-path gas analyzer measuring CO2 and H2O concentrations; 4 Campbell FW3 fine-wire thermocouples and a Campbell CSAT-3 three-dimensional sonic anemometer, and were made at 3.76 m above the tower base, which remained at 2.8 m above the water level during the campaign. Mean concentrations of CO2 with Vaisala GM343 sensors were made at the tower, at 1.77 and 3.66 m above the tower base. The sensors were intercompared before the field experiment. The measurements reported here took place from 00:00 hrs Local Time of Dec 8th 2012 to 00:00 hrs of Dec 13 8th 2012. During most of the time there was fair weather, and the wind came predominantly from the North or North-East, with very favorable fetches. Standard data processing included coordinate rotation, linear detrending, despiking and density corrections. Peak positive and negative CO2 fluxes were -0.016 and +0.013 mmol/m2/s, respectively, with a mean value over the 5-day period of -0.14 mmol/m2/s. This may be compared to CO2 flux estimates using a SVAT model over soy, which yielded peak daytime values of 0.027 mmol/m2/s. These values should be interpreted as local both in time and space (i.e. neither representative of the whole lake or the whole land), and more research is needed to extend their representativeness in time and space. The sign of the CO2 fluxes showed qualitative agreement with 30-min. mean CO2 measurements, with most runs displaying the same sign for the fluxes and (minus) the mean CO2 concentration difference between the 1.77 and 3.66-m levels, suggesting that CO2 flux estimates with mass-transfer theory may be feasible at the site.

Dias, N. L.; Crivellaro, B. L.; Armani, F. S.; Chor, T. L.; Gobbi, M. F.; Santos, A. L.; Lemma/UFPR Scientific Team

2013-05-01

2

A barrier to upstream migration in the fish passage of Itaipu Dam (Canal da Piracema), Paraná River basin  

USGS Publications Warehouse

The majority of the fish passages built in the Neotropical region are characterised by low efficiency and high selectivity; in many cases, the benefits to fish populations are uncertain. Studies conducted in the Canal da Piracema at Itaipu dam on the Parana River indicate that the system component designated as the Discharge channel in the Bela Vista River (herein named Canal de deságue no rio Bela Vista or CABV), a 200 m long technical section, was the main barrier to the upstream migration. The aim of this study was to evaluate the degree of restriction imposed by the CABV on upstream movements of Prochilodus lineatus and Leporinus elongatus, Characiformes. Fish were tagged with passive integrated transponders (PIT tags) and released both downstream and upstream of this critical section. Individuals of both species released downstream of the CABV took much more time to reach the upper end of the system (43.6 days vs. 15.9 days), and passed in much lower proportions (18% vs. 60.8%) than those tagged upstream of this component. Although more work is needed to differentiate between fishway effects and natural variation in migratory motivation, the results clearly demonstrate passage problems at the CABV.

Theodore R Castro-Santos; Fontes Júnior, Hélio Martins; Makrakis, Sergio; Gomes, Luiz Carlos; Latini, João Dirço

2012-01-01

3

Prediction of Egeria najas and Egeria densa occurrence in a large subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay)  

Microsoft Academic Search

Incidence data of two native submerged aquatic macrophytes (Egeria najas Planch. and Egeria densa Planch.) were obtained in eight arms of a large (1350km2) subtropical reservoir (Itaipu Binacional Reservoir, Brazil-Paraguay). Environmental variables were measured simultaneously. Two large-scale surveys in the same localities identified by a global positioning system were carried out in April 1999 (n=235) and January 2001 (n=230). Logistic

Luis Mauricio Bini; Sidinei Magela Thomaz

2005-01-01

4

Social impacts of Brazil's Tucurui Dam  

SciTech Connect

The Tucurui Dam, which blocked the Tocantins River in 1984 in Brazil's eastern Amazonian state of Para, is a continuing source of controversy. Most benefits of the power go to aluminum smelting companies, where only a tiny amount of employment is generated. Often presented by authorities as a model for hydroelectric development because of the substantial power that it produces, the project's social and environmental impacts are also substantial. Examination of Tucurui reveals a systematic overestimation of benefits and underestimation of impacts as presented by authorities. Tucurui offers many as-yet unlearned lessons for hydroelectric development in Amazonia.

Fearnside, P.M.

1999-11-01

5

Dams  

NSDL National Science Digital Library

National Geographic's Dams Web site offers an interactive investigation into the good and bad impacts of dam construction. Visitors choose to view a river system before, during, or after a dam is built. Then at each time interval they can click on various sections of the river and read a short description of what is happening there. For example, after the dam is built, the reservoir that is created upstream causes several hydrological problems such as loss of water from evaporation. Although the text provided on the site is somewhat lacking, the well-done graphics and interactivity make it worth a visit.

1997-01-01

6

Dams  

NSDL National Science Digital Library

Through eight lessons, students are introduced to many facets of dams, including their basic components, the common types (all designed to resist strong forces), their primary benefits (electricity generation, water supply, flood control, irrigation, recreation), and their importance (historically, currently and globally). Through an introduction to kinetic and potential energy, students come to understand how dams generate electricity. They learn about the structure, function and purpose of locks, which involves an introduction to Pascal's law, water pressure and gravity. Other lessons introduce students to common environmental impacts of dams and the engineering approaches to address them. They learn about the life cycle of salmon and the many engineered dam structures that aid in their river passage, as they think of their own methods and devices that could help fish migrate past dams. Students learn how dams and reservoirs become part of the Earth's hydrologic cycle, focusing on the role of evaporation. To conclude, students learn that dams do not last forever; they require ongoing maintenance, occasionally fail or succumb to "old age," or are no longer needed, and are sometimes removed. Through associated hands-on activities, students track their personal water usage; use clay and plastic containers to model and test four types of dam structures; use paper cups and water to learn about water pressure and Pascal's Law; explore kinetic energy by creating their own experimental waterwheel from two-liter plastic bottles; collect and count a stream's insects to gauge its health; play an animated PowerPoint game to quiz their understanding of the salmon life cycle and fish ladders; run a weeklong experiment to measure water evaporation and graph their data; and research eight dams to find out and compare their original purposes, current status, reservoir capacity and lifespan. Woven throughout the unit is a continuing hypothetical scenario in which students act as consulting engineers with a Splash Engineering firm, assisting Thirsty County in designing a dam for Birdseye River.

Integrated Teaching And Learning Program

7

Ascent of neotropical migratory fish in the Itaipu Reservoir fish pass  

USGS Publications Warehouse

The Piracema Canal is a complex 10-km fish pass system that climbs 120m to connect the Paran?? River to the Itaipu Reservoir along the Brazil-Paraguay border. The canal was constructed to allow migratory fishes to reach suitable habitats for reproduction and feeding in tributaries upstream from the reservoir. The Piracema Canal attracted 17 of the 19 long-distance migratory species that have been recorded in the Paran?? River Basin and Paraguay-Paran?? Basin. However, the incidence of migratory fish decreased from downstream to upstream, with the pattern of decrease depending on species. Overall, 0.5% of the migratory fish that entered the Piracema Canal and segment 1, eventually were able to reach segment 5 and potentially Itaipu Reservoir. Ascension rate was examined relative to various physical attributes of canal segments; maximum water velocity emerged as the most influential variable affecting fish passage. Water velocity may be manipulated by controlling water discharge, and by re-engineering critical sections of the canal. Because the Itaipu Reservoir flooded a set of falls that separated two distinct biogeographical regions, facilitating fish movements through the Piracema Canal into the Itaipu Reservoir presents a management dilemma that requires deliberation in the context of the fish assemblages rather than on selected migratory species. ?? 2010 John Wiley & Sons, Ltd.

Makrakis, S.; Miranda, L. E.; Gomes, L. C.; Makrakis, M. C.; Junior, H. M. F.

2011-01-01

8

RADIOCARBON DATING SITES OF ITAPARICA DAM, SÃO FRANCISCO RIVER VALLEY, BRAZIL  

Microsoft Academic Search

This paper reports radiocarbon dates of samples from archaeological sites in the Itaparica Dam region of the São Francisco River (Brazil). This region is important due to the evidence of its use by several prehistoric groups of hunter- gatherers. In the 1980s, a Brazilian state hydroelectric company (CHESF) engaged the federal universities of Bahia and Per- nambuco to perform an

L R P de Andrade Lima

9

Brazil's Balbina Dam: Environment versus the legacy of the Pharaohs in Amazonia  

Microsoft Academic Search

The Balbina Dam in Brazil's state of Amazonas floods 2360 km2 of tropical forest to generate an average of only 112.2 MW of electricity. The flat topography and small size of the drainage basin make output small. Vegetation has been left to decompose in the reservoir, resulting in acidic, anoxic water that will corrode the turbines. The shallow reservoir contains

Philip M. Fearnside

1989-01-01

10

HPLC DETERMINATION OF HORMONES IN SÃO JOSÉ DO RIO PRETO MUNICIPAL DAM, SÃO PAULO, BRAZIL  

Microsoft Academic Search

In this study, the concentrations of the natural hormone 17?-estradiol and the synthetic hormones levonorgestrel and 17? -ethylestradiol were determined in the water of São José do Rio Preto Municipal Dam (SP, Brazil). The SPE method was used to extract the hormones and HPLC\\/FLU\\/DAD was used to measure their concentrations. The method was validated according to Resolution-RE 899\\/2003 from the

Daniela Cordeiro; Guilherme Casoni da Rocha; Eduardo Makoto Onaka; Luciana Teresa Dias Cappelini; Renata de Oliveira Pereira; Vitor Hugo Polisél Pacces; Eny Maria Vieira

2012-01-01

11

Brazil's Samuel Dam: lessons for hydroelectric development policy and the environment in Amazonia.  

PubMed

Brazil's Samuel Dam, which formed a 540-km2 reservoir in the state of Rondônia in 1988, provides lessons for development decisions throughout Amazonia and in other tropical areas. The decision to build the dam was heavily influenced by its role in the political strategies of key decision makers. Samuel illustrates both impacts and benefits of electricity supply and the dilemmas facing decision makers regarding the various options for planned electricity generation. Environmental costs included flooding forest and stimulating illegal logging activity throughout western Amazonia because of an exception opened for Samuel in Brazil's prohibition of export of raw logs. Samuel emitted substantially more greenhouse gases than would have been emitted by generating the same amount of electricity from oil. Contamination of fish in the reservoir resulted from methylation of mercury present in the soil. Social costs of the dam included resettlement of 238 families of farmers; impacts on indigenous people were indirect. Mitigating measures included faunal rescue and creation of a forest reserve. The lessons of Samuel include the need to consider a full range of alternatives prior to making decisions in practice and the importance of adhering to the logical sequence of decision making, where information is gathered and compared prior to the decision. It also shows the need to maintain flexibility when the costs and benefits of different alternatives change significantly over the course of the project's planning and execution, as occurred at Samuel. PMID:15984060

Fearnside, Philip M

2005-01-01

12

Profiles of sex steroids, fecundity, and spawning of the curimatã-pacu Prochilodus argenteus in the São Francisco River, downstream from the Três Marias Dam, Southeastern Brazil  

Microsoft Academic Search

The present study evaluated for the first time sex steroid profiles and fecundity in females of Prochilodus argenteus from two sections of the São Francisco River Brazil, downstream from the Três Marias Dam, which influences characteristics of their water habitat. The model species in the study, P. argenteus, is an important commercial and recreational species in Brazil. In the region

Fábio. P. Arantes; Helio B. Santos; Elizete Rizzo; Yoshimi Sato; Nilo Bazzoli

2010-01-01

13

Profiles of sex steroids, fecundity, and spawning of the curimatã-pacu Prochilodus argenteus in the São Francisco River, downstream from the Três Marias Dam, Southeastern Brazil.  

PubMed

The present study evaluated for the first time sex steroid profiles and fecundity in females of Prochilodus argenteus from two sections of the São Francisco River Brazil, downstream from the Três Marias Dam, which influences characteristics of their water habitat. The model species in the study, P. argenteus, is an important commercial and recreational species in Brazil. In the region closest to the dam (section 1), females did not reach final oocyte maturation, failed to spawn, and displayed lesser circulating concentrations of testosterone, 17(-hydroxyprogesterone (17(-P) and 17beta-estradiol (E2) than those farther downstream of the dam (section 2). The endocrine and fecundity deficiencies probably are attributed to lower water temperature and oxygen concentration in (section 1). The follicular atresia rate in the region closest to the dam (26%) was greater than those fish captured farther downstream of the dam (13%), after the Abaeté River (section 2). Variations in testosterone, E2 and 17(-P concentrations in section 2, followed gonadal maturation which are typical features of species which have seasonal reproduction, group-synchronous oocyte development, and are single batch spawners such as P. argenteus. Results document the first evidence of endocrine and reproductive dysfunctions caused by inadequate water conditions in a wild population of the migratory species P. argenteus in the São Francisco River, downstream from the Três Marias dam. PMID:19683404

Arantes, Fábio P; Santos, Helio B; Rizzo, Elizete; Sato, Yoshimi; Bazzoli, Nilo

2010-04-01

14

Selection of Design Features for 737 and 823 MVA Hydrogenerators for Itaipu Project  

Microsoft Academic Search

The unprecedented capacity of the ITAIPU hydroelectric station and the size of its generating units made it imperative to reappraise the nature of the problems associated with the design and fabrication of giant size hydroelectric machinery.

Julival De Moraes; J. Rodriguez Villalba; V. F. Salatko

1979-01-01

15

Influence of environmental parameters on the concentration of subsurface dissolved methane in two hydroelectric power plants in Brazil  

NASA Astrophysics Data System (ADS)

Methane (CH4) is a trace gas in the atmosphere of great importance for atmospheric chemistry as one of the main greenhouse gases. There are different sources with the largest individual production associated with the degradation of organic matter submerged in flooded areas. The amount of dissolved methane that reaches the surface depends on the production in the sediments and consumption in the water column. Both processes are associated with microbial activity and consequently dependent on the physico-chemical environmental conditions. The construction of hydroelectric dams cause flooding of areas near the river that can change the characteristics of the environment and cause changes in subsurface methane concentration. In this work, we studied two hydroelectric plants located in Brazil: Batalha (17°20'39.52"S, 47°29'34.29"W), under construction when the samples were take, and Itaipu (25°24'45.00"S, 54°35'39.00"W) which has been floated over 30 years ago. The water samples to determine dissolved methane were collected approximately 5 cm near the surface. In each collection point was measured depth, water temperature, pH and redox potential. The range of dissolved methane between the two dams was similar: 0.07-10.33 ?g/l (Batalha) and 0.15-10.93 ?g/l (Itaipu). However, the Batalha's average (4.04 × 3.43 ?g/l; median = 3.66 ?g/l) was higher than that observed in Itaipu (2.15 × 1.59 ?g/l; median = 2.53 ?g/l). The influence of environmental parameters on the concentration of dissolved methane was evaluated by multivariate statistical techniques (Principal Component Analysis - PCA). All of the parameters had some correlation with dissolved methane, however, the greatest contribution in Batalha was associated with pH while in Itaipu was the depth. The pH variation of the various points studied in Batalha may be associated with periods of drought and flooding of the river and hence the incorporation of organic matter in the environment. The organisms responsible for the production and oxidation of methane in water are very susceptible to changes in pH, resulting in variations in the amount of gas that is transported to the surface. In Itaipu, depth variation was shown to have more influence than the other parameters. The increase of the water column results in a longer path through which methane is transported, increasing the oxidation potencial by bacteria in the water, decreasing the amount of CH4 can be emitted to the atmosphere. The comparison between the two dams showed that the environmental parameters influences the the production and consumption of methane in water and the importance of each parameter can vary according to the characteristics of each reservoir.

Silva, M. G.; Marani, L.; Alvala, P. C.

2013-12-01

16

Dam Impacts  

NSDL National Science Digital Library

While the creation of a dam provides many benefits, it can have negative impacts on local ecosystems. Students learn about the major environmental impacts of dams and the engineering solutions used to address them.

Integrated Teaching And Learning Program

17

Dam Forces  

NSDL National Science Digital Library

Students learn how the force of water helps determine the size and shape of dams. They use clay to build models of four types of dams, and observe the force of the water against each type. They conclude by deciding which type of dam they, as Splash Engineering engineers, will design for Thirsty County.

Integrated Teaching And Learning Program And Laboratory

18

Environmental assessment of the area surrounding Dam Rio Verde - Parana/Brazil. An overview of environmental geomorphology.  

PubMed

This paper presents a brief essay on the situation in which the environment of the dam of the Rio Verde Basin-Parana, from the vision of environmental geomorphology. The area is located between the cities of Campo Magro and Campo Largo, Paraná plateau in the first part of theAlto Iguaçu basin. This study aims to raise the concepts relating to environmental geomorphology, to identify the anthropogenic impacts caused in the reservoir areas, identify the environmental compartments found around the dam and characterize the geologic and physiographic region. It was found that the area has intense anthropogenic influence, as urban growth is present in areas and wavy and rough terrain, subject to mass movements and floods. Besides these aspects, the use of land for agriculture contributes to fragility of the area. PMID:23424831

Garcia, Claudia Moreira; Carrijo, Beatriz Rodrigues; Sessegolo, Gisele; Passos, Everton

2012-04-01

19

106. DAM EARTH DIKE SUBMERSIBLE DAMS & DIKE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

106. DAM - EARTH DIKE - SUBMERSIBLE DAMS & DIKE CONN. AT MOVABLE DAM (ML-8-52/2-FS) March 1940 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississippi River near Houston County, MN, Genoa, Vernon County, WI

20

Hydroelectric Dams  

NSDL National Science Digital Library

Although hydroelectric power represents a relatively small portion of the world's energy resources, it is still an important commodity with great potential. To harness hydropower, civil engineers must design dams that convert the kinetic energy of water into electricity.The fundamentals of general-use dams are discussed on the home page of the US Society on Dams (1). Besides providing brief background information, there are a few examples of the benefits of dams to society. For a much more technical perspective, check out the Hydropower Program of the US Department of Energy (2). This site examines (among other things) research and development and turbine systems used in hydropower operations. There are several reports available for download, many of which deal with improved technology that minimizes environmental hazards. A good place for grade school students to learn about dams is at National Geographic's Geoguide Web site (3). On the main page, the user can learn about different stages of development in dam construction. A section for classroom and family activities suggests many fun, educational projects that are suitable for kindergarten through high school. The Hydroelectric Design Center (see #4 above for URL) is part of the Army Corps of Engineers. The center's home page has a lot of information about hydropower projects with which it is involved, as well as descriptions of processes and components of a hydropower plant. Possibly the most famous dam in North America is the Hoover Dam (5). History, articles, functional descriptions, pictures, and other media are on the Hoover Dam Web site. A sharp contrast to the glory of the Hoover Dam is the Three Gorges Dam project in China (6). If it is completed, it will be the biggest dam on Earth; however, environmental concerns plague the project with controversy. This Web site outlines the enormous scale of the project and explains the possible benefits and disastrous consequences that may result. The Three Gorges Dam is the subject of a great activity for middle school students at DiscoverySchool.com (7). The activity is set up as a detailed lesson plan that lets teachers introduce the problems and benefits of the dam; additionally, basic engineering concepts are discussed. Hydropower could mean more than just electricity for the Lao People's Democratic Republic, a small country in Indochina where poverty is widespread. The Nam Theun 2 hydroelectric project (8) could bring substantial revenues from exported electricity.

Leske, Cavin.

2002-01-01

21

107. DAM EARTH DIKE SUBMERSIBLE DAMS PLANS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

107. DAM - EARTH DIKE - SUBMERSIBLE DAMS - PLANS & SECTIONS (ML-8-52/3-FS) March 1940 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississippi River near Houston County, MN, Genoa, Vernon County, WI

22

New Mexico: Dam Rio Grande  

Microsoft Academic Search

Flowing from southwestern Colorado to the Gulf of Mexico is the Rio Grande. Pictured is a dam along the the major river. With a total length of 1,896 miles, there are a large number of dams along the Rio Grande. These include: Cochiti Dam, Elephant Butte Dam, Caballo Dam, Amistad Dam, Falcon Dam, Anzalduas Dam, and Retamal Dam.

Chet Smolski

1993-01-01

23

INFLUENCE OF THE ABAETERIVER ON THE REPRODUCTIVE SUCCESS OF THE NEOTROPICAL MIGRATORY TELEOST PROCHILODUS ARGENTEUS IN THE SAO FRANCISCO RIVER, DOWNSTREAM FROM THE TRES MARIAS DAM, SOUTHEASTERN BRAZIL  

Microsoft Academic Search

The curimata ˜-pacu Prochilodus argenteus is an important characiform from the Sao Francisco River basin that performs long- distance migrations for spawning upstream during the rainy season, when the temperature and photoperiod are elevated. Despite the interruption of the migratory routes by the Tres Marias Dam and accentuated decline in fishing, the curimata ˜-pacu still sustains the fisheries at the

YOSHIMI SATO; ELIZETE RIZZO; MARIA BEATRIZ; MARIO O. T. MIRANDAd

24

Methane release below a tropical hydroelectric dam  

NASA Astrophysics Data System (ADS)

Tropical reservoirs upstream from hydroelectric dams are known to release significant amounts of methane to the atmosphere. Here we demonstrate that methane emissions downstream from hydroelectric dams can also be large. Emissions of CH4 downstream of Balbina reservoir in the central Amazon basin (Brazil) were calculated from regular measurements of degassing in the outflow of the turbines and downstream diffusive losses. Annual emissions from the reservoir surface and downstream from the dam were 34 and 39 Gg C, respectively. The downstream emission alone represented the equivalent of 3% of all methane released from central Amazon floodplain.

Kemenes, Alexandre; Forsberg, Bruce Rider; Melack, John Michael

2007-06-01

25

Are Dams Forever?  

NSDL National Science Digital Library

Students learn that dams do not last forever. Similar to other human-made structures, such as roads and bridges, dams require regular maintenance and have a finite lifespan. Many dams built during the 1930-70s, an era of intensive dam construction, have an expected life of 50-100 years. Due to inadequate maintenance and/or for environmental reasons, some of these dams will fail or be removed in the next 50 years. The engineers with Splash Engineering have an ethical obligation to remind Thirsty County of the maintenance and lifespan concerns associated with its dam.

Integrated Teaching And Learning Program And Laboratory

26

Safety of Tailings Dams  

NSDL National Science Digital Library

Contains information on different aspects of tailings dams; tailings dam properties, disasters, failure modes, slurry waves, stability analysis, and safe tailings disposal. Also includes a slope stability calculator and a tailings flow slide calculator.

2008-08-25

27

Dam Pass or Fail  

NSDL National Science Digital Library

Students conduct Internet research to investigate the purpose and current functioning status of some of the largest dams throughout the world. They investigate the success or failure of eight dams and complete a worksheet. While researching the dams, they also gain an understanding of the scale of these structures by recording and comparing their reservoir capacities. Students come to understand that dams, like all engineered structures, have a finite lifespan and require ongoing maintenance and evaluation for their usefulness.

Integrated Teaching And Learning Program

28

Engineer a Dam  

NSDL National Science Digital Library

In this activity, learners explore the function and engineering of dams and how dams have many uses and solve many problems in the world. Learners work in teams to engineer their own dam structure in a water trough that has the ability to release water in a controlled manner, as might be used in irrigation. Learners present their plans, execute and test their dams, and reflect on the experience.

Ieee

2014-05-22

29

EARTHEN & CONCRETE DAMS  

NSDL National Science Digital Library

Civil Engineers will work on a wide variety of projects. One area that they may specialize in is Earthen and Concrete Dams. As a civil drafter you may find yourself working on one of these massive projects. This instructional unit will give you a basic introduction to the many different types of dams and how they are constructed. Lets begin by introducing you to the basic terminology and design structures of a dam. The following link will help you in gaining a basic knowledge of these amazing structures. Learn About Dams Even though you now have a basic understanding of dams, you are still a long ways away from being an ...

Taylor, Professor D.

2005-11-17

30

16. Parker Dam, only top fourth of dam visible, at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. Parker Dam, only top fourth of dam visible, at 320' high, Parker Dam is one of the highest in the world. Much of this height is because dam penetrates well below river bottom to fasten to bedrock. - Parker Dam, Spanning Colorado River between AZ & CA, Parker, La Paz County, AZ

31

9. Excavation work at Pleasant Dam (now called Waddell Dam). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Excavation work at Pleasant Dam (now called Waddell Dam). Photographer unknown, July, 22, 1926. Source: Maricopa County Municipal Water Conservation District Number One (MWD). - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

32

NEW ENGLAND DAMS  

EPA Science Inventory

With the National Dam Inspection Act (P.L. 92-367) of 1972, Congress authorized the U.S. Army Corps of Engineers (USACE) to inventory dams located in the United States. The Water Resources Development Act of 1986 (P.L 99-662) authorized USACE to maintain and periodically publish...

33

Dammed or Damned?  

ERIC Educational Resources Information Center

Summarizes issues raised at a workshop on "People and Dams" organized by the Society for Participatory Research in Asia. Objectives were to (1) understand problems created by dams for people, (2) consider forces affecting displaced populations and rehabilitation efforts, and (3) gain a perspective on popular education efforts among affected…

Hirsch, Philip

1988-01-01

34

Morris Dam Ballistic Range.  

National Technical Information Service (NTIS)

The Morris Dam Ballistic Range is located on a lake formed by Morris Dam on the San Gabriel River, about five miles north of Azusa, California. The range facilities are used in the acquisition and study of water entry data, underwater trajectory character...

1964-01-01

35

Dynamics of Dam Sliding: Aznalcóllar Dam, Spain  

Microsoft Academic Search

\\u000a Aznalcóllar dam, a 28 m high rockfill dyke, failed catastrophically on April 25, 1998 and triggered an uncontrolled flow of\\u000a acid pyritic tailings whose volume was estimated in 5.5 Mm3. Chapter 4 describes the failure, the geotechnical properties of stored tailings and foundation soils and the stability analysis\\u000a performed to explain the reasons for the failure. The failure was described

Eduardo E. Alonso; Núria M. Pinyol; Alexander M. Puzrin

36

United States Society on Dams  

NSDL National Science Digital Library

The United States Society on Dams (USSD) is a professional organization that promotes the advancement of dam engineering and technology, and fosters public awareness of the importance of dams. The best feature on the society's home page is its excellent introduction to dams and their benefits. First, a short definition of a dam is given, and then some reasons for their construction are outlined with specific examples. There are many pictures of dams across the country, and most have explanations for their importance. Hydroelectric power as a renewable resource is discussed in detail. This Web site is a good learning resource for both kids and adults.

2002-01-01

37

Dams and Intergovernmental Transfers  

NASA Astrophysics Data System (ADS)

Gainers and Losers are always associated with large scale hydrological infrastructure construction, such as dams, canals and water treatment facilities. Since most of these projects are public services and public goods, Some of these uneven impacts cannot fully be solved by markets. This paper tried to explore whether the governments are paying any effort to balance the uneven distributional impacts caused by dam construction or not. It showed that dam construction brought an average 2% decrease in per capita tax revenue in the upstream counties, a 30% increase in the dam-location counties and an insignificant increase in downstream counties. Similar distributional impacts were observed for other outcome variables. like rural income and agricultural crop yields, though the impacts differ across different crops. The paper also found some balancing efforts from inter-governmental transfers to reduce the unevenly distributed impacts caused by dam construction. However, overall the inter-governmental fiscal transfer efforts were not large enough to fully correct those uneven distributions, reflected from a 2% decrease of per capita GDP in upstream counties and increase of per capita GDP in local and downstream counties. This paper may shed some lights on the governmental considerations in the decision making process for large hydrological infrastructures.

Bao, X.

2012-12-01

38

Usoi Dam (Tajikistan) the highest landslide dam on the world  

NASA Astrophysics Data System (ADS)

Natural dams an integral part of the landscape formation. They are formed when the soil from slopes blocks the watercourse. The development of such dam may lead to two rare but desirable extreme outcomes: quick easing of the new dam and leakage of water accumulated behind it or stabilization of the dam and the establishment of a permanent outflow of water from the newly formed lake before it overflows the dam. All outcomes between these two extremes pose a threat commonly resulting in catastrophic floods causing massive damage to the flooded areas. The largest known dam of this kind, more than 500 m high and existing already 100 years, is the Usoi Dam in Tajikistan. The dam is located in the Amur Darya river basin.

Roje-Bonacci, Tanja

2014-05-01

39

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2010 CFR

...publications regarding dam safety are available from...Planning Guidelines for Dams,âFEMA 64. (ii...Federal Guidelines for Earthquake Analysis and Design of Dams,âFEMA 65. (iii...94. (iv)âDam Safety: An Owner's...

2010-01-01

40

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2010 CFR

...publications regarding dam safety are available from...Planning Guidelines for Dams,âFEMA 64. (ii...Federal Guidelines for Earthquake Analysis and Design of Dams,âFEMA 65. (iii...94. (iv)âDam Safety: An Owner's...

2009-01-01

41

12. DIABLO DAM: VIEW OF DIABLO DAM AND SEATTLE CITY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. DIABLO DAM: VIEW OF DIABLO DAM AND SEATTLE CITY LIGHT BOATHOUSE AS SEEN FROM THE ROSS RESORT BOAT LANDING NORTH SIDE OF DIABLO LAKE, 1989. - Skagit Power Development, Diablo Dam, On Skagit River, 6.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

42

11. DIABLO DAM: VIEW OF DIABLO DAM AS SEEN FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. DIABLO DAM: VIEW OF DIABLO DAM AS SEEN FROM NORTH SHORE BETWEEN THE INTAKE STRUCTURE AND SEATTLE CITY LIGHT BOAT DOCK AND SHOWING THE FORMER, 1989. - Skagit Power Development, Diablo Dam, On Skagit River, 6.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

43

Small dams need better management  

NASA Astrophysics Data System (ADS)

Many small dams around the world are poorly maintained and represent a safety hazard, according to Pisaniello et al. Better oversight of small dams is needed, the authors argue. The researchers reviewed literature, conducted case studies in four states in Australia, and developed policy benchmarks and best practices for small-dam management. Small dams, often just several meters high and typically privately owned by individual farmers, have historically caused major damage when they fail. For instance, in China in 1975, 230,000 people died when two large dams failed because of the cumulative failure of 60 smaller upstream dams. In the United States, in 1977 the 8-meter-high Kelly Barnes Lake dam failed, killing 39 people. Many other small-dam failures around the world have resulted in casualties and severe ecological and economic damage.

Balcerak, Ernie

2012-03-01

44

Assessment of spermatogenesis and plasma sex steroids in a seasonal breeding teleost: a comparative study in an area of influence of a tributary, downstream from a hydroelectric power dam, Brazil.  

PubMed

River damming and building of hydroelectric power plants interrupt the reproductive migration routes and change the major physicochemical parameters of water quality, with drastic consequences for populations of migratory fishes. The goal of this study was to evaluate proliferation and cell death during spermatogenesis and serum profiles of sex steroids in Prochilodus argenteus, from the São Francisco River, downstream from the Três Marias Dam. A total of 257 adult males were caught quarterly during a reproductive cycle in two sites: the first 34 km of the river after the dam (site 1) and the second 34-54 km after the dam (site 2), after the confluence with a tributary, the Abaeté River. Seasonal changes in the testicular activity associated with morphometric analyses of germ cells as well as proliferation and testicular apoptosis support a more active spermatogenesis in fish from site 2, where higher levels of sex steroids and gonadosomatic index (GSI) were also found. In site 1, fish presented low serum levels of testosterone, 17?-estradiol and 17?-hydroxyprogesterone and a low GSI during gonadal maturation. Spermatogonial proliferation (PCNA) and apoptosis (TUNEL) were more elevated in fish from site 1, but spermatocytes were mainly labelled in fish from site 2. Overall, these data demonstrate changes in testicular activity and plasma sex steroids in a neotropical teleost fish living downstream from a hydroelectric dam, supplying new data on fish reproduction in regulated rivers. Moreover, morphometric analyses associated with sex steroids profiles provide reliable tools to assess fish spermatogenesis under environmental stress conditions. PMID:22688450

Domingos, Fabricio F T; Thomé, Ralph G; Arantes, Fabio P; Castro, Antonio Carlos S; Sato, Yoshimi; Bazzoli, Nilo; Rizzo, Elizete

2012-12-01

45

A Catalog of Italian Dams.  

National Technical Information Service (NTIS)

This handbook has been compiled with the aim to systematize the information on Italian dams in order to use it in the construction of dams in the USSR. The handbook includes information on 325 dams of height 20 m and more, constructed up to July 1, 1967. ...

V. A. Romanova

1971-01-01

46

DEVELOPMENT OF A RIVER SEDIMENT TRANSPORT MONITORING SYSTEM FOR LARGE RESERVOIRS  

Microsoft Academic Search

Determining the amount of sediment being transported by rivers is fundamental to determine the environmental impact on reservoirs, as well as to estimate their life span. This monitoring is particularly important for large hydroelectric dams such as the Itaipu hydroelectric facility on the Paraná River, which provides over 24% of the electricity needs for Brazil. A system was developed to

T. A. Cochrane; L. D. Norton; J. H. Caviglione

47

75 FR 62024 - Metal and Nonmetal Dams  

Federal Register 2010, 2011, 2012, 2013

...and 57 RIN 1219-AB70 Metal and Nonmetal Dams AGENCY: Mine Safety and Health Administration...construction, operation, and maintenance of safe dams which can assure miners are protected from the hazards of dam failures. DATES: The comment period...

2010-10-07

48

Health impacts of large dams  

Microsoft Academic Search

Large dams have been criticized because of their negative environmental and social impacts. Public health interest largely has focused on vector-borne diseases, such as schistosomiasis, associated with reservoirs and irrigation projects. Large dams also influence health through changes in water and food security, increases in communicable diseases, and the social disruption caused by construction and involuntary resettlement. Communities living in

Leonard B Lerer; Thayer Scudder

1999-01-01

49

Why Do We Build Dams?  

NSDL National Science Digital Library

Students are introduced to the concept of a dam and its potential benefits, which include water supply, electricity generation, flood control, recreation and irrigation. This lesson begins an ongoing classroom scenario in which student engineering teams working for the Splash Engineering firm design dams for a fictitious client, Thirsty County.

Integrated Teaching And Learning Program

50

Steam generator nozzle dam system  

Microsoft Academic Search

Many utilities are utilizing steam generator nozzle dams inside their steam generators to permit refueling and eddy-current testing or repair of steam generator tubes to occur simultaneously. Prior to consideration of this application, steam generator nozzles did not have any means to positively hold such dams in place. However, some of the current steam generator nozzles are supplied with flange

1985-01-01

51

6. GENE WASH DAM, LOOKING NORTHWEST. SURVEY REFLECTOR IN FOREGROUND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. GENE WASH DAM, LOOKING NORTHWEST. SURVEY REFLECTOR IN FOREGROUND FOR MONITORING MOVEMENT OF DAM AND EARTH. - Gene Wash Reservoir & Dam, 2 miles west of Parker Dam, Parker Dam, San Bernardino County, CA

52

Three Dams in Central Arizona: A Study in Technological Diversity.  

National Technical Information Service (NTIS)

Three important dams in central Arizona will be used to illustrate relevant issues of dam technology in the United States. These three structures - Roosevelt Dam (completed in 1911), Stewart Mountain Dam (1930), and Horseshoe Dam (1946) - Were built under...

D. C. Jackson C. B. Fraser

1992-01-01

53

Natural Debris Dams and Debris-Dam Lakes  

NSDL National Science Digital Library

This site contains information that will help students to realize that in addition to the direct risk from debris flows and debris avalanches, voluminous deposition of volcanic material in valleys commonly forms unstable natural dams by blocking preexisting drainages and that if the size and structural integrity of the blockage is insufficient to hold back the reservoir that will form, catastrophic failure of the dam will result. Such a hazardous situation may persist for months, years, or decades following an eruption. An example is given of Mount St. Helens, where the debris avalanche raised the level of Spirit Lake 64 meters and dammed its natural outlet even higher and lakes formed in the tributaries of Coldwater and Castle Creeks. In addition, the site has links to publications and reports documenting historical landslide dams from around the world.

54

Review of Tiber Dam--Raising of Dam and Dike.  

National Technical Information Service (NTIS)

The Division of Technical Review performs conceptual reviews of the design, construction, and initial operation of dams and major structures, including modifications to such structures. The purpose of this report is to summarize and document the technical...

1982-01-01

55

NRC (Nuclear Regulatory Commission) Inventory of Dams.  

National Technical Information Service (NTIS)

The NRC Inventory of Dams has been prepared as required by the charter of the NRC Dam Safety Officer. The inventory lists 51 dams associated with nuclear power plant sites and 14 uranium mill tailings dams (licensed by NRC) in the U.S. as of February 1, 1...

G. E. Lear O. O. Thompson

1983-01-01

56

JAPANESE EXPERIENCES IN RESETTLEMENT FOR DAM CONSTRUCTION  

Microsoft Academic Search

Some modalities planned or implemented in Japan in the past may be applied for future dam construction projects in the developing world. For example, some innovative ideas were planned for the Numata Dam, the largest dam construction project ever considered in Japan. The major concern of the planned Numata Dam was the number of resettlers, which was then estimated to

MIKIYASU NAKAYAMA

57

CLEARWATER SUBBASIN, ID -- DAM LOCATIONS  

EPA Science Inventory

This map includes locations of dams in the Clearwater subbasin, Idaho. Source: US Army Corps of Engineers, BPA, and State Water Resource Departments from the Eastside Ecosystems Management Project. ...

58

Economic Analysis of Dam Decommissioning.  

National Technical Information Service (NTIS)

This report describes the typical range of direct implementation cost, other direct cost (lost benefits), and benefit components, along with potential measurement methodologies, associated with economic benefit-cost analyses of dam decommissioning.

J. L. Platt

2003-01-01

59

Elwha River Riparian Vegetation Response to Dams and Dam Removal  

NASA Astrophysics Data System (ADS)

Riparian vegetation is highly diverse and influences habitat of aquatic and terrestrial wildlife. Riparian vegetation dynamics are driven by stream flow regime, and fluxes of sediment and large woody debris, all of which can be altered by river damming. Dam removal is often implemented, in part, to help restore degraded riparian vegetation by reversing the alteration of these key drivers. However, increased disturbance and sediment flux associated with transport and exposure of trapped reservoir sediment can complicate a simple return to pre-dam conditions and can favor exotic species. We are studying the effects of dams and their removal on riparian vegetation along the Elwha River in Washington State, where removal of two large dams began in September 2011. To characterize vegetation composition, structure, and diversity prior to dam removal, we sampled 60-150 vegetation plots in 2004, 2005, and 2010 along five cross-valley transects in each of three river reaches: above both dams (upper reach), between the dams (middle reach), and downstream of both dams (lower reach). In summer 2012, we resampled a subset of our plots in the lower and middle reaches to evaluate vegetation and geomorphic change. We also sampled vegetation, topography, and grain size along newly-established transects within the exposed former reservoir behind Elwha Dam, which was removed in 2011 and 2012. Plant community distribution on bottomland geomorphic surfaces along the Elwha is typical of other systems in the region. We identified 8 overstory and 26 understory communities using multivariate analyses. Young bar surfaces (5-20 yrs) were dominated by willow, red alder, and black cottonwood. Floodplains and transitional fluvial terraces (<90yrs) were generally dominated by alder and cottonwood. Mature terraces (>90yrs) were often dominated by big-leaf maple. Douglas fir occurred on both young and old floodplains and terraces. Overstory species composition was more stable from 2005 to 2010 than understory, understory species composition was more influenced by reach than overstory, and understory communities on younger landforms were less stable. From 2005 to 2010, there was a 26% increase in species richness in the lower reach but no significant changes elsewhere. In both 2005 and 2010 there was a significant decrease in native species richness (26% and 30% respectively) from the furthest upstream to furthest downstream reach. Exotic species richness was significantly higher in the downstream reach compared to the upstream reach in both years. Following dam removal, we documented different pioneer plant communities growing on different surfaces within the former reservoir behind Elwha Dam. Some surfaces were dominated by exotic species of concern to resource managers, such as Canada thistle and reed canarygrass, while others contained typical, native pioneer communities dominated by willow, alder, and cottonwood. Along our existing monitoring transects, we documented some sediment deposition on channel margins, bars and low floodplain surfaces, particularly in the lower reach; relatively little new deposition occurred in the more armored and stable middle reach. Future monitoring will reveal changes to existing vegetation communities and development of new communities in the former reservoirs as removal of the upstream dam is completed and millions of m3 of sediment are redistributed.

Shafroth, P. B.; Brown, R. L.; Clausen, A. J.; Chenoweth, J.

2012-12-01

60

17. VIEW OF MAIN AND DIVERSION DAMS FROM WATERGATE AFTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. VIEW OF MAIN AND DIVERSION DAMS FROM WATER-GATE AFTER REMOVAL OF DRIFTWOOD. DIVERSION DAM IN LEFT FOREGROUND, MAIN DAM TO THE RIGHT. Photographed July 18, 1938. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

61

Three Gorges Dam, China  

NASA Technical Reports Server (NTRS)

This ASTER image shows a 60 km stretch of the Yangtze River in China, including the Xiling Gorge, the eastern of the three gorges. In the left part of the image is the construction site of the Three Gorges Dam, the world's largest.

This image was acquired on July 20, 2000 by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite. With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER will image Earth for the next 6 years to map and monitor the changing surface of our planet.

ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. Dr. Anne Kahle at NASA's Jet Propulsion Laboratory, Pasadena, California, is the U.S. Science team leader; Bjorn Eng of JPL is the project manager. The Terra mission is part of NASA's Earth Science Enterprise, a long-term research and technology program designed to examine Earth's land, oceans, atmosphere, ice and life as a total integrated system.

The broad spectral coverage and high spectral resolution of ASTER will provide scientists in numerous disciplines with critical information for surface mapping, and monitoring dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.

Size: 60 x 24 km (36 x 15 miles) Location: 30.6 deg. North lat., 111.2 deg. East long. Orientation: North at top Image Data: ASTER bands 1,2, and 3. Original Data Resolution: 15 m Date Acquired: July 20, 2000

2002-01-01

62

A brief history of 20th century dam construction and a look into the future  

NASA Astrophysics Data System (ADS)

In this presentation, an overview is given of global dam building activities in the 20th century. Political, economical and hydrological factors shaped the building of large dams. The development of the relations between these three factors and dam building over time is examined. One can argue whether or not history is simply "one damn thing after another" but the second half of the 20th century suggests that history is at least reflected by the construction of one dam after another. The financial crisis of the 1930's started the first construction wave of large hydropower dams in the United States. This wave continued into the Second World War. During the Cold War, the weapon race between the USA and USSR was accompanied by a parallel neck-and-neck race in dam construction. By the 1970's, dam construction in the USA tapered off, while that in the USSR continued until its political disintegration. In China, we see two spurts in dam development, the first one coinciding with the disastrous Great Leap Forward and the second with the liberalization of the Chinese economy after the fall of the Berlin Wall. Economic and political events thus shaped to an important extent decisions surrounding the construction of large dams. Clearly, there are some hydrological prerequisites for the construction of dams. The six largest dam building nations are USSR, Canada, USA, China, Brazil, and India, all large countries with ample water resources and mountain ranges. Australia has relatively little reservoir storage for the simple fact that most of this country is flat and dry. A few countries have relatively large amounts of reservoir storage. Especially Uganda (Owens Falls), Ghana (Akosombo), and Zimbabwe (Kariba) are examples of small countries where gorges in major rivers were "natural" places for large dams and reservoirs to be built early on. It seems that, deserts aside, the average potential storage capacity lies for most continents around 10 cm or about 50% of the total yearly continental runoff. Some of the least developed countries, such as Papua New Guinea, Congo DR, and Myanmar, still have large hydropower development potential. In most countries, however, dam construction seems to have reached its peak. For the presentation, use is made of GapMinder software (www.gapminder.org), which provides direct insight in the dynamic and multi-dimensonial aspects of 20th century dam construction.

van de Giesen, Nick

2010-05-01

63

The Dramatic Methods of Hans van Dam.  

ERIC Educational Resources Information Center

Interprets for the American reader the untranslated dramatic methods of Hans van Dam, a leading drama theorist in the Netherlands. Discusses the functions of drama as a method, closed dramatic methods, open dramatic methods, and applying van Dam's methods. (SR)

van de Water, Manon

1994-01-01

64

The Best Dam Simulation Ever  

NSDL National Science Digital Library

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest. Learners play the role of dam operator, controlling how much water passes through the dam each season. First, learners choose whether it's a very dry or wet (or average) year and adjust the level of the reservoir in fall, winter, spring and summer. Learners see how their choices affect the migrating river salmon, power bills, recreation, agriculture, flooding, and fish that live in the reservoir. The results are compared to those of the real operators, and learners can print out a copy of your final report.

Omsi

2006-01-01

65

Should We Dam Nanticoke Creek?  

NSDL National Science Digital Library

In this decision-making exercise, students investigate what would occur if a dam were built along Nanticoke Creek, a real stream just north of West Corners near the Village of Endicott, New York. They will use topographic maps to determine how much area would be flooded by the new reservoir, to study river drainages, and to consider the impacts of dams on a region. They must also consider rivers in the context of their relation to humankind. The exercise can be extended to other, more local locations having similar topography.

Childs, Philip

66

33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.  

Code of Federal Regulations, 2013 CFR

...Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208...Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. ...objectives of the Marshall Ford Reservoir (Lake Travis) are the improvement of...

2013-07-01

67

Safety of Dams: Flood and Earthquake Criteria.  

National Technical Information Service (NTIS)

The Safety of Dams: Flood and Earthquake Criteria concerns the levels of safety to be provided at new and existing dams to withstand extreme floods and earthquakes. The report includes a thorough inventory of safety criteria for dams in use in the United ...

1985-01-01

68

Dam Safety and the Environment.  

National Technical Information Service (NTIS)

The volume is a compendium of papers presented at the Seminar on Dam Safety and the Environment held in Washington, D.C., in April 1989, and sponsored by the World Bank. The main objective of the seminar was to consolidate the experience of World Bank sta...

G. Le Moigne S. Barghouti H. Plusquellec

1990-01-01

69

Subdaily Hydrologic Variability by Dams  

NASA Astrophysics Data System (ADS)

The effects dams have on hydrologic, geomorphic, and ecologic regimes has been well characterized using mean daily discharge. Subdaily discharge variation (herein flashiness) has not been well characterized for a variety of dam, watershed, and land cover characteristics. The hourly hydrologic records for 30 sites across the continental United States were analyzed for flashiness using the Richards-Baker Index, coefficient of daily variation, percent of total flow variation, and the percent of the year when daily discharge is greater than mean daily discharge. The goal of this analysis is to evaluate the role of catchment variables such as mean slope and land use conditions across receiving watersheds in predicting flashiness; compare flashiness metrics across sites to identify relationships between dam related variables such as type and size; and determine the most appropriate temporal extent for assessing flashiness in streamflow. Our approach relies on data at the watershed scale with a fine temporal grain to determine flashiness over a decade of operation for each dam.

Costigan, K. H.; Ruffing, C.; Smith, J. M.; Daniels, M. D.

2012-12-01

70

The Dos Bocas dam in Puerto Rico.  

NSDL National Science Digital Library

The Dos Bocas dam in Puerto Rico was constructed in 1942 to generate hydroelectric power. Dams in this region prevent the migration of shrimp and fish to areas upstream of the dam. As a result, compared to similar reaches of undammed streams, areas that are upstream of dammed rivers have higher amounts of organic and inorganic nutrients as well as altered invertebrate populations. Loss of migratory shrimp and fish upstream from dams alters basal resources and assemblages of invertebrate competitors and prey. This photograph originally appeared on the cover of Ecological Applications (16:1) in February of 2006.

Klemow, Kenneth

2010-02-11

71

Diversion dam reduces decomposition, fungal biomass, and macroinvertebrate abundance and diversity: Implications for dam removal  

NASA Astrophysics Data System (ADS)

Dam decommissioning projects are rarely accompanied by adequate baseline data needed to test if the effects of dams are reversible. Although the effects of dams on aquatic species have been well-documented, there are few studies that document the effects of dams on ecosystem processes. In this study we examine how in-stream leaf litter processing rates and associated fungal and macroinvertebrate populations are affected by a dam in Fossil Creek, Arizona, which will be decommissioned in 2005. We found significantly faster decomposition rates above the dam accompanied by higher fungal biomass, invertebrate abundances and invertebrate diversity compared to below the dam. We predict that return of full flows will increase decomposition, fungal biomass, and secondary productivity in areas where flow is currently reduced. This study shows how diversion dams can inhibit ecosystem processes and provides data for testing the restoration potential of dam decommissioning on decomposition and decomposer communities.

Muehlbauer, J. D.; Lovett, J. M.; Jones, K. L.; Plichta, J. R.; Patrick, M. M.; Delaney, I. A.; Bennett, S. E.; Norman, P. A.; Flaccus, K. K.; Vlieg, J. A.; Leroy, C. J.; Marks, J. C.

2005-05-01

72

Egypt: after the Aswan Dam  

SciTech Connect

Ten years after its completion, the controversial Aswan High Dam's hydrologic and human consequences are clearer because of a joint US-Egyptian interdisciplinary study. Water supply and distribution is emerging as a major world resource problem with the recognition that unsafe drinking water and inadequate sanitation contribute to health problems. Dams provide water supplies, but they also create conditions favorable to the spread of water-borne diseases. The Aswan Dam solved problems of flooding and drought by opening 2.5 million acres to year-round irrigation, although some of the reclaimed land has been lost to urban expansion and shoreline erosion, and provides hydroelectric power. The negative effects include increasing soil salinity, changes in the water table, excessive downstream water plant growth, and diseases such as schistosomiasis and other intestinal parasites, and the social impact on the Nubians, whose homeland was flooded. Planners must use the information gathered in this study to see that the benefits outweigh the human costs. 22 references, 7 figures.

Walton, S.

1981-05-01

73

Analysis of dam safety management system in China  

Microsoft Academic Search

Due to an increasing amount of dam damage or break in resent years, great importance is attached to dam safety management in many countries. This paper analyzes the status of Chinese dam safety management according to the integral safety concept for dam including structural safety, dam safety monitoring, operational safety and emergency planning. Comparing with the safety management of large

Cheng Cuiyun; Qian Xin; Zhang Yuchao; Sheng Jinbao

2010-01-01

74

18. DETAIL AT JUNCTION OF MAIN DAM AT LEFT AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. DETAIL AT JUNCTION OF MAIN DAM AT LEFT AND DIVERSION DAM AT RIGHT SHOWING LOG CRIBBING. SPACES INSIDE CRIBBING WERE FILLED WITH STONE TO ANCHOR DAM; DETERIORATION OF DAM HAS ALLOWED STONE BALLAST TO WASH AWAY. Photographed July 18, 1938. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

75

PROBABILISTIC METHOD FOR SEISMIC VULNERABILITY RANKING OF CANADIAN HYDROPOWER DAMS  

Microsoft Academic Search

A probabilistic method was developed for ranking Canadian hydropower dams according to their seismic vulnerability. The method is based on the probabilistic seismic hazard at the dam location, the seismic fragility of the dam, and the construction date of the dam. The seismic hazard is represented by the peak ground acceleration of seismic motions at the dam location for a

Lan Lin; John Adams

76

Exporting dams: China's hydropower industry goes global.  

PubMed

In line with China's "going out" strategy, China's dam industry has in recent years significantly expanded its involvement in overseas markets. The Chinese Export-Import Bank and other Chinese financial institutions, state-owned enterprises, and private firms are now involved in at least 93 major dam projects overseas. The Chinese government sees the new global role played by China's dam industry as a "win-win" situation for China and host countries involved. But evidence from project sites such as the Merowe Dam in Sudan demonstrates that these dams have unrecognized social and environmental costs for host communities. Chinese dam builders have yet to adopt internationally accepted social and environmental standards for large infrastructure development that can assure these costs are adequately taken into account. But the Chinese government is becoming increasingly aware of the challenge and the necessity of promoting environmentally and socially sound investments overseas. PMID:18992986

McDonald, Kristen; Bosshard, Peter; Brewer, Nicole

2009-07-01

77

Winnibigoshish Dam, Mississippi River, Minnesota, Reconnaissance Report for Dam Safety Assurance Program.  

National Technical Information Service (NTIS)

This reconnaissance report evaluates the Winnibigoshish Dam and Lake project for potential safety hazards using current standards and state of the art. Winnibigoshish Dam is located on the Mississippi River in north central Minnesota, 1247.9 river miles a...

1985-01-01

78

78 FR 53494 - Dam Safety Modifications at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams  

Federal Register 2010, 2011, 2012, 2013

...Modifications of Dam Structures: Combination of Concrete Floodwalls and Earthen Embankments...Bar). TVA also installed a permanent concrete apron on approximately 2 acres of the...Modifications of Dam Structures: Combination of Concrete Floodwalls and Earthen...

2013-08-29

79

Peak outflow from a breached embankment dam  

USGS Publications Warehouse

A relation for rapidly predicting the peak outflow rate from a breached embankment dam has been presented. The prediction equation is based on reliable data from 19 embankment dam failures and requires as input the volume of water in the reservoir at the time a breach begins to form, and the estimated height of the final breach. Peak outflow predicted by the equation can be used with simplified flood routing procedures to determine peak flows at locations downstream of a dam. Use of the prediction equation will improve the accuracy of rapid assessments of damage that would be caused by the flood resulting from an embankment dam failure.

Froehlich, David, C.

1989-01-01

80

Hoover Dam: The American Experience Online  

NSDL National Science Digital Library

The American Experience Online presents this companion site to its recent American Experience film about the one of the greatest hydroengineering feats in history. The Hoover Dam, in Black Canyon on the Colorado River, at the Arizona-Nevada border, was built between 1930 and 1936 and is the highest concrete arch dam in the US. The site provides a program description, an enhanced transcript of the film, a brief bibliography, a list of the dam facts, an essay that explores the economic and environmental effects of the dam, a timeline, a map, a People and Events Database, and a teacher's guide.

1999-01-01

81

World Wide Web Pages for Dam Design  

NSDL National Science Digital Library

This site is a very informative and well presented resource for dam design, primarily intended to give undergraduates or anyone interested in the subject a solid introduction to the basic concepts. Maintained at the University of Durham in Britain, there are many sections that provide a good overview of the many processes involved in building a dam. Many different types of dams are described in detail, including concrete and embankment dams. Hydrology and geology, important factors that need to be considered when choosing a suitable location, are also covered. The layout of the site is fairly good overall, but navigating the many sections and subsections can sometimes get confusing.

1997-01-01

82

10. BRIDGE IN CONTEXT OF DAM, THIRD POWER HOUSE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. BRIDGE IN CONTEXT OF DAM, THIRD POWER HOUSE IN FOREGROUND, LOOKING NORTH BY 360 DEGREES - Columbia River Bridge at Grand Coulee Dam, Spanning Columbia River at State Route 155, Coulee Dam, Okanogan County, WA

83

10. DIABLO DAM: DETAIL OF TAINTOR GATES FROM UPSTREAM ON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. DIABLO DAM: DETAIL OF TAINTOR GATES FROM UPSTREAM ON NORTH END OF DAM, 1989. - Skagit Power Development, Diablo Dam, On Skagit River, 6.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

84

77 FR 9265 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2012-02-16

85

78 FR 47695 - Sam Rayburn Dam Power Rate  

Federal Register 2010, 2011, 2012, 2013

...Southwestern Power Administration Sam Rayburn Dam Power Rate AGENCY: Southwestern Power Administration...SUMMARY: The current Sam Rayburn Dam Project rate was approved by the Federal...Southwestern has developed a proposed Sam Rayburn Dam rate to recover the required...

2013-08-06

86

77 FR 67813 - Sam Rayburn Dam Project Power Rate  

Federal Register 2010, 2011, 2012, 2013

...Southwestern Power Administration Sam Rayburn Dam Project Power Rate AGENCY: Southwestern...existing power rate for the Sam Rayburn Dam Project (Rayburn), Rate Schedule SRD-08...Hydro Power and Energy Sold to Sam Rayburn Dam Electric Cooperative, Inc., for a...

2012-11-14

87

77 FR 22801 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2012-04-17

88

78 FR 7810 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2013-02-04

89

78 FR 21415 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2013-04-10

90

76 FR 24516 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2011-05-02

91

2. East side of lower dam shown with water flowing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. East side of lower dam shown with water flowing over dam. VIEW WEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

92

14. VIEW OF DAM SITE, LOOKING SOUTH (DOWNSTREAM). MIXING PLANT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. VIEW OF DAM SITE, LOOKING SOUTH (DOWNSTREAM). MIXING PLANT IS VISIBLE AT RIGHT, COFFER DAM IS UPSTREAM OF PLACING TOWER. EAST DOME IS VISIBLE AT LEFT OF TOWER, c. 1927 - Coolidge Dam, Gila River, Peridot, Gila County, AZ

93

21 CFR 872.6300 - Rubber dam and accessories.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Rubber dam and accessories. 872.6300 Section... Miscellaneous Devices § 872.6300 Rubber dam and accessories. (a) Identification. A rubber dam and accessories is a device...

2013-04-01

94

1996 McNary Dam, Ice Harbor Dam, and Lower Monumental Dam Smolt Monitoring Program. Annual report.  

National Technical Information Service (NTIS)

The Washington Department of Fish & Wildlife (WDFW) assumed responsibility for the Smolt Monitoring Program at McNary Dam on the Columbia River in 1990 and at the new juvenile collection facility at Lower Monumental Dam on the Snake River in 1993. In 1996...

T. Hillson P. Hoffarth S. Lind W. Price R. Tudor

1997-01-01

95

Fragility Analysis of Concrete Gravity Dams  

NASA Astrophysics Data System (ADS)

Concrete gravity dams are an important part ofthe nation's infrastructure. Many dams have been in service for over 50 years, during which time important advances in the methodologies for evaluation of natural phenomena hazards have caused the design-basis events to be revised upwards, in some cases significantly. Many existing dams fail to meet these revised safety criteria and structural rehabilitation to meet newly revised criteria may be costly and difficult. A probabilistic safety analysis (PSA) provides a rational safety assessment and decision-making tool managing the various sources of uncertainty that may impact dam performance. Fragility analysis, which depicts fl%e uncertainty in the safety margin above specified hazard levels, is a fundamental tool in a PSA. This study presents a methodology for developing fragilities of concrete gravity dams to assess their performance against hydrologic and seismic hazards. Models of varying degree of complexity and sophistication were considered and compared. The methodology is illustrated using the Bluestone Dam on the New River in West Virginia, which was designed in the late 1930's. The hydrologic fragilities showed that the Eluestone Dam is unlikely to become unstable at the revised probable maximum flood (PMF), but it is likely that there will be significant cracking at the heel ofthe dam. On the other hand, the seismic fragility analysis indicated that sliding is likely, if the dam were to be subjected to a maximum credible earthquake (MCE). Moreover, there will likely be tensile cracking at the neck of the dam at this level of seismic excitation. Probabilities of relatively severe limit states appear to be only marginally affected by extremely rare events (e.g. the PMF and MCE). Moreover, the risks posed by the extreme floods and earthquakes were not balanced for the Bluestone Dam, with seismic hazard posing a relatively higher risk.

Tekie, Paulos B.; Ellingwood, Bruce R.

2002-09-01

96

McNary Dam, Ice Harbor Dam, and Lower Monumental Dam Smolt Monitoring Program; 1996 Annual Report.  

SciTech Connect

The Washington Department of Fish & Wildlife (WDFW) assumed responsibility for the Smolt Monitoring Program at McNary Dam on the Columbia River in 1990 and at the new juvenile collection facility at Lower Monumental Dam on the Snake River in 1993. In 1996, Smolt Monitoring Program activities also began at the new juvenile collection facility located at Ice Harbor Dam. This report summarizes the 1996 Smolt Monitoring work at all three sites. The work at Ice Harbor consisted of Gas Bubble Trauma (GBT) monitoring only. In general, the 1996 passage season at both the McNary and Lower Monumental sites can be characterized by reduced passage of juveniles through the collection systems due to elevated river flows and spill, and low (<1%) overall facility mortality rates most likely resulting from cooler water temperatures. In accordance with the National Marine Fisheries Service recommendations (NMFS, 1995) all spring migrants were bypassed at McNary Dam in 1996. Mechanical problems within the McNary collection system resulted in collection and sampling activities being delayed until April 18 at this site, while sampling and collection began on the scheduled starting date of April 1 at Lower Monumental Dam. Monitoring operations were conducted through December 14 at McNary Dam and through October 28 at Lower Monumental Dam. An ongoing transportation evaluation summer migrant marking program was conducted at McNary Dam in 1996 by the NMFS. This necessitated the sampling of 394,211 additional fish beyond the recommended sampling guidelines. All total, 509,237 and 31,219 juvenile salmonids were anesthetized and individually counted, examined for scale loss, injuries, and brands by WDFW Smolt Monitoring personnel in 1996 at McNary Dam and Lower Monumental Dam, respectively.

Hillson, Todd; Lind, Sharon; Price, William (Washington Department of Fish and Wildlife, Olympia, WA)

1997-07-01

97

Estimating flow through an earthen dam  

NSDL National Science Digital Library

Students make measurements of dam dimensions and water levels above and below a small, accessible earthen dam. They assess the soil texture in the field. They follow up by developing a simple flow net and estimating seepage rate as part of a problem set. They discuss their assumptions and the likely sources and magnitude of error.

Savage, Kaye

98

Historic American Engineering Record, Stewart Mountain Dam.  

National Technical Information Service (NTIS)

The report provides a written narrative of the events leading to the construction of Stewart Mountain Dam on the Salt River, in Central Arizona. Stewart Mountain Dam was constructed by the Salt River Valley Water Users' Association between 1928 and 1930. ...

D. C. Jackson

1992-01-01

99

Historic American Engineering Record: Horseshoe Dam.  

National Technical Information Service (NTIS)

The report provides a written narrative of the events leading to the construction of Horseshoe Dam on the Verde River, in Central Arizona. Horseshoe Dam was constructed between 1944 and 1946 by the Salt River Valley Water Users' Association and the Phelps...

D. C. Jackson C. B. Fraser

1991-01-01

100

Horizontal displacements of rock foundations of dams  

SciTech Connect

This paper uses geodetic survey methods to assess the horizontal displacements of dam foundations for several hydroelectric power plants in the Soviet Union. The effects of filling the reservoirs are outlined and the dependence of the degree of displacement on dam height is analyzed. The results are tabulated.

Karlson, A.A.

1987-08-01

101

104. DAM TAINTER GATE NONSUBMERGIBLE UPPER FRAME ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

104. DAM - TAINTER GATE - NON-SUBMERGIBLE - UPPER FRAME AND SKIN PLATE (ML-8-48/2-FS) June 1935 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississippi River near Houston County, MN, Genoa, Vernon County, WI

102

Do we need construct more dams?  

NASA Astrophysics Data System (ADS)

This paper reviews global dam development in association with the growths of global population, economy, and energy consumption in the past several decades, and also evaluates contributions of dam development to future world sustainable development. Eventually, this paper answers whether we need more dams in the future or not. The world population has rapidly increased from 1.6 billion in 1900, 2.5 billion in 1950, 6.1 billion in 2000, to 7.0 billion in 2011, and is projected to reach 9.5 billion in 2050; similarly, the world economy has dramatically expanded. To maintain socioeconomic development, the consumption of water, food and energy has increased rapidly as well. However, the total volume of available water resource over the world is limited, the food production largely depends on water supply, and the main energy sources are still oil, coal and gas at present, which are regarded as non-renewable resources. Accordingly, it is expected that we will face serious problems to deal with the challenges of water crisis, food security and energy shortage in the near future. In order to enhance the capability of regulating water resource, a great number of global dams (and related reservoirs) have been constructed in the last one hundred years; currently, almost all large rivers over the world have been regulated by dams. The reservoirs can supply sufficient water for irrigated land to ensure food production, and the associated hydropower stations can generate electricity. This article collects the dam data from the ICOLD (International Commission on Large Dams) and GRanD (Global Reservoir and Dam) databases, and some socioeconomic data, including population, economy, and consumptions of water, food and energy over the world. Analysis of these data reveals that global dam development has a great impact on the world sustainable development. Further, it is concluded that we need further dam development to maintain our future development.

Chen, J.; Shi, H.

2013-12-01

103

Seismic Analysis of Morrow Point Dam  

SciTech Connect

The main objective of this study is to perform nonlinear dynamic earthquake time history analyses on Morrow Point Dam, which is located 263 km southwest of Denver, Colorado. This project poses many significant technical challenges, one of which is to model the entire Morrow Point Dam/Foundation Rock/Reservoir system which includes accurate geology topography. In addition, the computational model must be initialized to represent the existing dead loads on the structure and the stress field caused by the dead loads. To achieve the correct dead load stress field due to gravity and hydrostatic load, the computer model must account for the manner in which the dams were constructed. Construction of a dam finite element model with the correct as-built geometry of the dam structure and simply ''turning on'' gravity in the computer model will generally lead to an incorrect initial stress field in the structure. The sequence of segmented lifts typical of dam construction has a significant impact on the static stress fields induced in the dam. In addition, the dam model must also account for the interaction between the adjacent dam segments across the dam contraction joints. As a result of these challenges, it was determined that a significant amount of code development was required in order to accurately simulate the motion of the dam structure. Modifications to the existing slide surfaces are needed to allow for appropriate modeling of the shear keys across the contraction joints. Furthermore, a model for hydrodynamic interaction was also implemented into NIKE3D and DYNA3D for fluid representation in the 3D dam system finite element model. Finally, the modeling of the 3D dam system results in a very large computational model, which makes it difficult to perform a static initialization using an implicit code. Traditionally, for these large models, the model has been initialized over a long time scale using an explicit code. However, recent advancements have made it possible to run NIKE3D in ''parallel'' on relatively small parallel machines as well as on the ASCI platforms.

Noble, C R

2002-04-01

104

Reply [to “Lake Nyos Dam  

NASA Astrophysics Data System (ADS)

The Lake Nyos natural d am consists largely of unconsolidated pyroclastic surge deposits emplaced during the formation of Nyos maar [Lockwood et al., 1987]. The emplacement age of the d am is critical for an evaluation of this flood hazard to northwestern Cameroon and eastern Nigeria, and for preparation of mitigation strategies. Carbonized wood from the base of the d am has been dated at 5000 and 400 years B.P. by Lockwood and Rubin [1988]. Because of the lack of weathering or of significant erosion of the associated pyroclastic deposits around Lake Nyos we suggested that the youngest radiocarbon age (0.4 kyr) best dated the formation of the Nyos maar and present dam. The 5-kyr date was obtained on water-worn material in stream deposits beneath the pyroclastic section; we suggested that this sample was contaminated by radiogenically “dead” CO2.

Lockwood, John P.

105

Dam Failure Inundation Map Project  

NASA Technical Reports Server (NTRS)

At the end of the first year, we remain on schedule. Property owners were identified and contacted for land access purposes. A prototype software package has been completed and was demonstrated to the Division of Land and Natural Resources (DLNR), National Weather Service (NWS) and Pacific Disaster Center (PDC). A field crew gathered data and surveyed the areas surrounding two dams in Waimea. (A field report is included in the annual report.) Data sensitivity analysis was initiated and completed. A user's manual has been completed. Beta testing of the software was initiated, but not completed. The initial TNK and property owner data collection for the additional test sites on Oahu and Kauai have been initiated.

Johnson, Carl; Iokepa, Judy; Dahlman, Jill; Michaud, Jene; Paylor, Earnest (Technical Monitor)

2000-01-01

106

46. Photocopy of photograph, c. 1933. VIEW OF DAM AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

46. Photocopy of photograph, c. 1933. VIEW OF DAM AND FOREBAY. NOTE ALL WATER FLOWING THROUGH FOREBAY AND OUT EITHER TAILRACE OR SLUICE GATE (INSTEAD OF OVER DAM) BECAUSE OF LOW WATER FLOW. (Courtesy of the Potomac Edison Company Library (Hagerstown, MD), Historical Data Files, Dam No. 5 listing - Dam No. 5 Hydroelectric Plant, On Potomac River, Hedgesville, Berkeley County, WV

107

8. WEST DAM, LOOKING DUE NORTH OVER TOP OF WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. WEST DAM, LOOKING DUE NORTH OVER TOP OF WEST DAM, SHOWING RELATIONSHIP BETWEEN OUTLET TO RIGHT OF DAM, NEW PUMP PLANT BUILDING AND CANAL TO LEFT OF DAM. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

108

78 FR 60271 - Hollow Dam Power Company; Ampersand Hollow Dam Hydro, LLC; Notice of Application for Transfer of...  

Federal Register 2010, 2011, 2012, 2013

...Dam Power Company; Ampersand Hollow Dam Hydro, LLC; Notice of Application for Transfer...transferor) and Ampersand Hollow Dam Hydro, LLC (transferee) filed an application...Dam Power Company, c/o SilverStreet Hydro, 15 East Silver Street, Westfield,...

2013-10-01

109

Analysis of seismic disaster failure mechanism and dam-break simulation of high arch dam  

NASA Astrophysics Data System (ADS)

Based on a Chinese national high arch dam located in a meizoseismal region, a nonlinear numerical analysis model of the damage and failure process of a dam-foundation system is established by employing a 3-D deformable distinct element code (3DEC) and its re-development functions. The proposed analysis model considers the dam-foundation-reservoir coupling effect, influence of nonlinear contact in the opening and closing of the dam seam surface and abutment rock joints during strong earthquakes, and radiation damping of far field energy dissipation according to the actual workability state of an arch dam. A safety assessment method and safety evaluation criteria is developed to better understand the arch dam system disaster process from local damage to ultimate failure. The dynamic characteristics, disaster mechanism, limit bearing capacity and the entire failure process of a high arch dam under a strong earthquake are then analyzed. Further, the seismic safety of the arch dam is evaluated according to the proposed evaluation criteria and safety assessment method. As a result, some useful conclusions are obtained for some aspects of the disaster mechanism and failure process of an arch dam. The analysis method and conclusions may be useful in engineering practice.

Zhang, Jingkui; Zhang, Liaojun

2014-06-01

110

Probabilistic Concept for Gravity Dam Analysis.  

National Technical Information Service (NTIS)

This report describes a probabilistic concept for evaluating the safety of concrete dams against sliding and overturning failures in terms of the various sources of uncertainty underlying the design parameters. This concept is used to compute the probabil...

J. D. Prendergast

1979-01-01

111

ESTIMATION OF NAVIGATION - DAM DISCHARGE IN ILLINOIS.  

USGS Publications Warehouse

Techniques were used to estimate discharge for the Brandon Road Dam on the Des Plaines River and the Dresden Island, Marseilles, and Starved Rock Dams on the Illinois River in northern Illinois. Tainter gates are operated to regulate streamflow at all dams. Additionally, headgates are used for regulation of the Brandon Road Dam. Stage-discharge, gate-opening relations were developed from a total of 91 discharge measurements that range from 198 to 86,400 cubic feet per second (5. 6 to 2,450 cubic meters per second). Values for discharge coefficients, in equations that express discharge as a function of tailwater depth, headwater depth, and vertical height of gate opening, were determined for conditions of free-orifice, submerged-orifice, free-weir, and submerged-weir flow past a tainter gate.

Weiss, Linda, S.

1987-01-01

112

The Hoover Dam: Lonely Lands Made Fruitful  

NSDL National Science Digital Library

Project designer Janet Haven of the University of Virginia American Studies Program presents the construction of the Hoover Dam as an alternative narrative to the devastation of the Great Depression in her photoessay, The Hoover Dam: Lonely Lands Made Fruitful. Five slide shows created in Flash2 cover the construction from diverting the Colorado River to pouring concrete and adding the final touches to a completed dam. The slide shows are prefaced by historical background, including short essays on topics such as the Dam as the "Machine in the Desert" and the text of Franklin D. Roosevelt's Dedication Speech upon completion, September 30, 1935. Images of maps and plans are linked throughout, and a list of Works Consulted gives concise source descriptions as well as ideas for further reading.

1998-01-01

113

Industrial design of an earth overflow dam  

SciTech Connect

As a result of theoretical and experimental investigations of earth overflow dams of various types and purpose conducted by the author in the past ten years, methods of calculating the stability of protective structures of riprap, reinforcement meshes, gabions, and in situ and precast reinforced concrete were substantiated; the limits of economic applicability of various types of revetments and structures were determined; and new efficient designs of dams and revetments allowing the overflow of water with large discharge intensities were proposed. An earth overflow dam with the downstream slope protected by a precast reinforced-concrete revetment was determined to be the most effective design-technological solution. Both the entire dam or a part of it can be made overflow. The design has been realized on a number of experimental water-management objects which are reviewed.

Pravdivets, Yu.P.

1988-06-01

114

Historic American Engineering Record, Theodore Roosevelt Dam.  

National Technical Information Service (NTIS)

Roosevelt Dam comprises the key structure in one of the first major federally sponsored reclamation project in the West. Authorized as one of the Reclamation Service's first projects in 1903, it continues to store water for agricultural lands, homeowners,...

D. C. Jackson

1992-01-01

115

76 FR 12094 - Whitman River Dam, Inc.  

Federal Register 2010, 2011, 2012, 2013

...2705, 2708. h. Applicant Contact: Robert T. Francis, P.O. Box 145, 10 Tommy Francis Road, Westminster, MA 01473, (978) 874-1010...adjacent to the dam containing one 145-kilowatt turbine generating unit. The proposed project is...

2011-03-04

116

78 FR 62627 - Sam Rayburn Dam Rate  

Federal Register 2010, 2011, 2012, 2013

...Southwestern Power Administration Sam Rayburn Dam Rate AGENCY: Southwestern Power Administration, DOE. ACTION: Notice of Rate Order...placed into effect on an interim basis Rate Order No. SWPA-67, which...

2013-10-22

117

Performance Parameters for Theodore Roosevelt Dam.  

National Technical Information Service (NTIS)

This focused summary of the performance parameters evaluation for Theodore Roosevelt Dam provides a guide to understanding and a quick means for review of (1) the potential failure modes and (2) the most important aspects of visual inspection and instrume...

1997-01-01

118

Hydraulic Model Study of Brantley Dam Spillway.  

National Technical Information Service (NTIS)

Hydraulic model studies on the spillway at Brantley Dam in New Mexico confirmed the design of the spillway, slotted bucket energy dissipator, and the spillway tailwater channel. Side piers at the spillway entrance were modified to improve spillway flow; a...

E. R. Zeigler

1987-01-01

119

Stability analysis of White Oak Dam  

SciTech Connect

White Oak Dam is located in the White Oak Creek watershed which provides the primary surface drainage for Oak Ridge National Laboratory. A stability analysis was made on the dam by Syed Ahmed in January 1994 which included an evaluation of the liquefaction potential of the embankment and foundation. This report evaluates the stability of the dam and includes comments on the report prepared by Ahmed. Slope stability analyses were performed on the dam and included cases for sudden drawdown, steady seepage, partial pool and earthquake. Results of the stability analyses indicate that the dam is stable and failure of the structure would not occur for the cases considered. The report prepared by Ahmed leads to the same conclusions as stated above. Review of the report finds that it is complete, well documented and conservative in its selection of soil parameters. The evaluation of the liquefaction potential is also complete and this report is in agreement with the findings that the dam and foundation are not susceptible to liquefaction.

NONE

1995-04-11

120

Hydraulics of embankment-dam breaching  

NASA Astrophysics Data System (ADS)

Constructed or natural earthen dams can pose hazards to downstream communities. Experiments to date on earthen-dam breaching have focused on dam geometries relevant to engineering practice. We have begun experiments with dam geometries more like those of natural dams. Water was impounded behind dams constructed at the downstream end of the USGS debris-flow flume. Dams were made of compacted, well-sorted, moist beach sand (D50=0.21 mm), 3.5 m from toe to toe, but varying in height from 0.5 to 1 m; the lower the dam, the smaller the reservoir volume and the broader the initially flat crest. Breaching was started by cutting a slot 30-40 mm wide and deep in the dam crest after filling the reservoir. Water level and pore pressure within the dam were monitored. Experiments were also recorded by an array of still- and video cameras above the flume and a submerged video camera pointed at the upstream dam face. Photogrammetric software was used to create DEMs from stereo pairs, and particle-image velocimetry was used to compute the surface-velocity field from the motion of tracers scattered on the water surface. As noted by others, breaching involves formation and migration of a knickpoint (or several). Once the knickpoint reaches the upstream dam face, it takes on an arcuate form whose continued migration we determined by measuring the onset of motion of colored markers on the dam face. The arcuate feature, which can be considered the head of the "breach channel", is nearly coincident with the transition from subcritical to supercritical flow; that is, it acts as a weir that hydraulically controls reservoir emptying. Photogenic slope failures farther downstream, although the morphologically dominant process at work, play no role at all in hydraulic control aside from rare instances in which they extend upstream so far as to perturb the weir, where the flow cross section is nearly self-similar through time. The domain downstream of the critical-flow section does influence the hydrograph in another way: the broader the initial dam crest, the longer the time before critical flow control is established. Flood duration is thus increased but peak discharge is decreased. Visual inspection and overhead videography reveal little turbidity in water pouring over the weir, implying that sediment there moves dominantly as bedload. Furthermore, underwater videography gives the overall impression that along the upstream dam face, erosion occurs without redeposition. Thus it would be a mistake to use empiricisms for equilibrium bedload transport to model erosion of the embankment. In mathematical terms, erosion rate cannot be backed out by calculating the divergence of transport rate; rather, transport rate should be regarded as the spatial integral of erosion rate. We use photogrammetry and motion of the colored markers to determine the erosion rate of the weir, and then infer shear stress at the weir by applying the van Rijn sediment-pickup function. Shear stress determined in this fashion is much less than what one calculates from the gradient of the energy head (an approach appropriate to steady flow). Shear stress inferred from the pickup-function calculation can serve as a constraint on computational fluid-dynamics models. Another constraint on such models, revealed by the underwater videography, is the upstream limit of sand movement, where bed shear stress equals the critical value for sand entrainment.

Walder, J. S.; Iverson, R. M.; Logan, M.; Godt, J. W.; Solovitz, S.

2012-12-01

121

Federal Guidelines for Dam Safety: Emergency Action Planning for Dam Owners.  

National Technical Information Service (NTIS)

In April 1977, President Carter issued a memorandum directing the review of federal dam safety activities by an ad hoc panel of recognized experts. In June 1979, the ad hoc interagency committee on dam safety (ICODS) issued its report, which contained the...

2004-01-01

122

Spontaneous Mutations Occur near Dam Recognition Sites in a dam-Escherichia coli Host  

PubMed Central

The mismatch repair system of Escherichia coli K12 removes mispaired bases from DNA. Mismatch repair can occur on either strand of DNA if it lacks N6-methyladenines within 5'-GATC-3' sequences. In hemimethylated heteroduplexes, repair occurs preferentially on the unmethylated strand. If both strands are fully methylated, repair is inhibited. Mutant (dam-) strains of E. coli defective in the adenine methylase that recognizes 5'-GATC-3' sequences (Dam), and therefore defective in mismatch repair, show increased spontaneous mutation rates compared to otherwise isogenic dam+ hosts. We have isolated and characterized 91 independent mutations that arise as a consequence of the Dam- defect in a plasmid-borne phage P22 repressor gene, mnt. The majority of these mutations are A:T?G:C transitions that occur within six base pairs of the two 5'-GATC-3' sequences in the mnt gene. In contrast, the spectrum of mnt- mutations in a dam+ host is comprised of a majority of insertions of IS elements and deletions that do not cluster near Dam recognition sites. These results show that Dam-directed post-replicative mismatch repair plays a significant role in the rectification of potential transition mutations in vivo, and suggest that sequences associated with Dam recognition sites are particularly prone to replication or repair errors.

Carraway, Margaretha; Youderian, Philip; Marinus, M. G.

1987-01-01

123

The Remains of the Dam: What Have We Learned From 10 Years of Dam Removals?  

NASA Astrophysics Data System (ADS)

Over the past 10 years in the U.S., dam removal has evolved from an occasionally implemented, rarely studied, and poorly understood intervention to improve rivers, to a much more frequently accomplished and better studied and understood approach to river restoration. Over that same time period, the numbers and sizes of dams and volumes of sediment released have dramatically increased. By some estimates close to 1000 dams have been removed over the last 100 years, with most of those occurring within the last 10. While most of these are small (less than 15 m high) dams, removals of dams up to 70 m high are presently underway. Releases of sediment associated with these removals over the past 10 years have also increased by close to four orders of magnitude; for example removal of the Elwha River dams in Washington is estimated to release almost 107 m3 of sediment into the lower Elwha River. Given a decade's worth of dam removals and, in some cases, well-orchestrated case studies of the effects of removal on the geomorphology and (to a lesser extent) ecology of rivers, what have we learned? More specifically, where do we now stand with respect to being able to predict the consequences of future dam removals? Drawing on both field examples and numerical models of dam removals in the western U.S., several key lessons stand out. Although every dam removal and river are different, removals initiate very rapid upstream river response and reservoir erosion and evacuation of sediment by various mechanisms that are strongly controlled by grain size of the deposit, volumes of residual sediment relative to total reservoir volume, and style of dam removal (instantaneous versus staged). Erosion of sediment accumulations in fully and partially filled (by sediment) reservoirs proceeds by different trajectories and rates, with full reservoirs releasing sediment primarily by upstream knickpoint retreat while erosion and sediment release in partially-filled reservoirs proceeds by vertical incision and delta progradation. Coarse grained non-cohesive sediment deposits erode by both vertical incision and lateral migration; fine-grained non-cohesive deposits can slump and fail catastrophically by landsliding. The rate of upstream reservoir erosion sets the tempo of downstream river adjustments and sedimentation. Prediction of location of sediment accumulations is bolstered by both 1- and 2-D hydrodynamic models that have proven to be remarkably accurate in predicting the spatial extent and pattern of deposition, but are less accurate with respect to predicting timing and longevity of deposits.Erosion of Marmot coffer dam on the Sandy River, OR following dam breach, October 19, 2007

Grant, G. E.; O'Connor, J. E.; Major, J. J.

2012-12-01

124

Numerical modelling dam break analysis for water supply project  

NASA Astrophysics Data System (ADS)

Dam provides many benefits to the society, but it can also cause extensive damage to downstream area when it fails. Dam failure can cause extensive damage to properties and loss of human life due to short warning time available. In general, dam spillway was designed to drain the maximum discharge from the dam during the Probable Maximum Flood (PMF). The spillway is functioned to prevent the dam from failure due to overtopping, which can lead to the dam failure. Dam failure will result in large volume of water travelling at very high velocity to the downstream area of the dam. It can cause extensive property damage, destruction of important facilities, and significant loss of human life along the way. Due to the potential of high hazard it poses to the downstream area, a dam break analysis is considered very essential. This paper focuses into the dam failure analysis for Kahang Dam by prediction of breach flow hydrographs and generation of inundation map at downstream area. From the PMF scenario simulation, the maximum inflow is 525.12 m3/s and peak discharge from the dam during dam failure is 6188m3/s. The results are able to provide information for preparation of Emergency Response Plan (PMF), in which appropriate steps can be taken by relevant authorities to avoid significant loss of human lives.

Lariyah, M. S.; Vikneswaran, M.; Hidayah, B.; Muda, Z. C.; Thiruchelvam, S.; Abd Isham, A. K.; Rohani, H.

2013-06-01

125

Channel changes downstream from a dam  

USGS Publications Warehouse

A flood-control dam was completed during 1979 on Bear Creek, a small tributary stream to the South Platte River in the Denver, Colorado, area. Before and after dam closure, repetitive surveys between 1977 and 1992 at five cross sections downstream of the dam documented changes in channel morphology. During this 15-year period, channel width increased slightly, but channel depth increased by more than 40 percent. Within the study reach, stream gradient decreased and median bed material sizes coarsened from sand in the pools and fine gravel on the riffle to a median coarse gravel throughout the reach. The most striking visual change was from a sparse growth of streamside grasses to a dense growth of riparian woody vegetation.

Hadley, R. F.; Emmett, W. W.

1998-01-01

126

Design of tailing dam using red mud  

NASA Astrophysics Data System (ADS)

Red mud, waste industrial product from aluminum industries produced approximately 75 million tonnes every year with less than half of this is used. Storage of this unutilized red mud takes vast tracts of usable land and pollutes, land, air and water. Construction of high embankments, under passes, flyovers, tailing dams uses vast tract of natural resources (top soil) is also matter of concern as its takes thousands of years to form the natural soil. This paper discusses use of red mud for construction of tailing dam based on laboratory findings and finite element analysis. The geotechnical properties such as plasticity, compaction, permeability, shear strength characteristics and dispersion of red mud are presented. Stability and seepage analysis of tailing dams as per finite element analysis using the above geotechnical parameters is presented.

Rout, Subrat K.; Sahoo, Tapaswini; Das, Sarat K.

2013-06-01

127

Safety Goals for High-Hazard Dams: Are Dams Too Safe?  

NASA Astrophysics Data System (ADS)

The 1977 National Dam Inspection Program determined that many high-hazard dams in the United States were incapable of passing a probable maximum flood (PMF). Retrofitting these dams was estimated to cost at least $10 billion. Since the PMF is revised upward periodically, retrofit is a continual issue. But surviving a PMF is a more stringent safety criterion than preventing other sources of dam failure; in addition, it is more stringent than safety criteria for other structures with respect to wind, earthquakes, or storm surges. This higher safety goal has large social costs. We propose an alternative safety goal, separating property damage from possible loss of lives. For a proposed dam whose failure could cause large loss of life or property damage, a careful evaluation should be done as to whether the dam should be built. For dams that impose smaller hazards, property damage should be handled by an analysis based on expected values of annualized benefits and costs. An adjustment for scale could be used if the property damage were extremely large. Danger to lives should be handled by establishing programs to warn and evacuate people. Our proposal should (1) lead to less injury and death, (2) use society's limited resources more efficiently, and (3) put the determination of safety goals on a more scientific and sensible basis.

Lave, Lester B.; Resendiz-Carrillo, Daniel; McMichael, Francis C.

1990-07-01

128

Safety goals for high-hazard dams: Are dams too safe  

SciTech Connect

The 1977 National Dam Inspection Program determined that many high-hazard dams in the US were incapable of passing a probable maximum flood (PMF). Retrofitting these dams was estimated to cost at least $10 billion. Since the PMF is revised upward periodically, retrofit is a continual issue. But surviving a PMF is a more stringent safety criterion than preventing other sources of dam failure; in addition, it is more stringent than safety criteria for other structures with respect to wind, earthquakes, or storm surges. This higher safety goal has large social costs. The authors propose an alternative safety goal, separating property damage from possible loss of lives. For a proposed dam whose failure could cause large loss of life or property damage, a careful evaluation should be done as to whether the dam should be built. For dams that impose smaller hazards, property damage should be handled by an analysis based on expected values of annualized benefits and costs. An adjustment for scale could be used if the property damage were extremely large. Danger to lives should be handled by establishing programs to warn and evacuate people. The authors' proposal should (1) lead to less injury and death, (2) use society's limited resources more efficiently, and (3) put the determination of safety goals on a more scientific and sensible basis.

Lave, L.B.; Resendiz-Carrillo, D.; McMichael, F.C. (Carnegie-Mellon Univ., Pittsburgh, PA (USA))

1990-07-01

129

Optimizing the dammed: water supply losses and fish habitat gains from dam removal in California.  

PubMed

Dams provide water supply, flood protection, and hydropower generation benefits, but also harm native species by altering the natural flow regime and degrading aquatic and riparian habitat. Restoring some rivers reaches to free-flowing conditions may restore substantial environmental benefits, but at some economic cost. This study uses a systems analysis approach to preliminarily evaluate removing rim dams in California's Central Valley to highlight promising habitat and unpromising economic use tradeoffs for water supply and hydropower. CALVIN, an economic-engineering optimization model, is used to evaluate water storage and scarcity from removing dams. A warm and dry climate model for a 30-year period centered at 2085, and a population growth scenario for year 2050 water demands represent future conditions. Tradeoffs between hydropower generation and water scarcity to urban, agricultural, and instream flow requirements were compared with additional river kilometers of habitat accessible to anadromous fish species following dam removal. Results show that existing infrastructure is most beneficial if operated as a system (ignoring many current institutional constraints). Removing all rim dams is not beneficial for California, but a subset of existing dams are potentially promising candidates for removal from an optimized water supply and free-flowing river perspective. Removing individual dams decreases statewide delivered water by 0-2282 million cubic meters and provides access to 0 to 3200 km of salmonid habitat upstream of dams. The method described here can help prioritize dam removal, although more detailed, project-specific studies also are needed. Similarly, improving environmental protection can come at substantially lower economic cost, when evaluated and operated as a system. PMID:24594701

Null, Sarah E; Medellín-Azuara, Josué; Escriva-Bou, Alvar; Lent, Michelle; Lund, Jay R

2014-04-01

130

Panoramic view from bluff south of Grand Coulee Dam; this ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Panoramic view from bluff south of Grand Coulee Dam; this segment of the panorama shows the westernmost extend of Franklin D. Roosevelt Lake and part of Grand Coulee Dam, looking north. - Columbia Basin Project, Grand Coulee, Grant County, WA

131

4. Aerial view of Whitsett intake (lower right), Parker Dam ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Aerial view of Whitsett intake (lower right), Parker Dam and village (left), Gene Wash Reservoir, Gene Pump Plant and village (right). - Parker Dam, Spanning Colorado River between AZ & CA, Parker, La Paz County, AZ

132

55. Downstream face of diversion dam looking northwest. Photographer Mark ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

55. Downstream face of diversion dam looking northwest. Photographer Mark Durben, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

133

7. Aggregate operations downstream from dam. Photographer unknown, March 1924. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. Aggregate operations downstream from dam. Photographer unknown, March 1924. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

134

49. Downstream face of Humbug Creek Diversion Dam with sluice ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

49. Downstream face of Humbug Creek Diversion Dam with sluice opening at center. Photographer James Eastwood, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

135

44. Reinforcement construction to Pleasant Dam. Photographer unknown, 1935. Source: ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

44. Reinforcement construction to Pleasant Dam. Photographer unknown, 1935. Source: Huber Collection, University of California, Berkeley, Water Resources Library. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

136

70. Downstream view of Waddell Dam spillway and taintor gates. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

70. Downstream view of Waddell Dam spillway and taintor gates. Photographer Mark Durben. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

137

56. Upstream face of diversion dam looking east. Headgates are ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

56. Upstream face of diversion dam looking east. Headgates are partially visible at far left. Photographer Mark Durben, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

138

40. Reservoir behind Pleasant Dam, looking downstream, spillway is at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

40. Reservoir behind Pleasant Dam, looking downstream, spillway is at right. Photographer unknown, c. late 1920s. Source: MWD. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

139

45. Reinforcement work to buttresses at Pleasant Dam. Support work ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

45. Reinforcement work to buttresses at Pleasant Dam. Support work for roadway and roadway visible. Photographer unknown, 1935. Source: Huber Collection. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

140

60. Waddell Dam in relation and spillway tailrace. Photographer Mark ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

60. Waddell Dam in relation and spillway tailrace. Photographer Mark Durben, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

141

39. Pleasant Dam from east abutment with spillway visible at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

39. Pleasant Dam from east abutment with spillway visible at center. Photographer unknown, 1927. Source: MWD. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

142

1. Site of Mormon Flat Dam looking upstream. Photographer unknown, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Site of Mormon Flat Dam looking upstream. Photographer unknown, 1923. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

143

57. Downstream side of left section of diversion dam. Photographer ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

57. Downstream side of left section of diversion dam. Photographer Mark Durben, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

144

50. Upstream face of Humbug Creek Diversion Dam showing sluice ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

50. Upstream face of Humbug Creek Diversion Dam showing sluice opening. Photographer James Eastwood, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

145

Corrective Action Study Geotechnical Issues at Salmon Lake Dam.  

National Technical Information Service (NTIS)

The Modification Decision Analysis (MDA) decision memorandum indicated that Salmon Lake Dam has dam safety deficiencies caused by the Maximum Credible earthquake (MCE) and the Probable Maximum Flood (PMF) (1)1. This technical memorandum (TM) presents the ...

R. L. Torres R. W. Luehring

1996-01-01

146

Nonlinear Earthquake Response of Concrete Gravity Dam Systems.  

National Technical Information Service (NTIS)

The earthquake response of concrete gravity dam systems is investigated with emphasis on the nonlinear behavior associated with tensile concrete cracking and water cavitation. A single dam-monolith is considered and is assumed to respond independently as ...

B. El-Aidi

1988-01-01

147

1. Salmon Creek Diversion Dam, weir (to left), sand and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Salmon Creek Diversion Dam, weir (to left), sand and silt sluice gate (center), main canal headworks (to right), view to northwest - Salmon Creek Diversion Dam, Salmon Creek, Okanogan, Okanogan County, WA

148

2. Salmon Creek Diversion Dam, overview, diversion weir center foreground, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Salmon Creek Diversion Dam, overview, diversion weir center foreground, headworks overflow weir to center left, view to east - Salmon Creek Diversion Dam, Salmon Creek, Okanogan, Okanogan County, WA

149

12. LOCK, ELECTRICAL SYSTEM, LOCK, DAM, AND NAVIGATION LIGHTING UNITS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. LOCK, ELECTRICAL SYSTEM, LOCK, DAM, AND NAVIGATION LIGHTING UNITS (October 1935) - Mississippi River 9-Foot Channel Project, Lock & Dam No. 18, Upper Mississippi River, Gladstone, Henderson County, IL

150

76. LOCK, ELECTRICAL SYSTEM, LOCK, DAM AND NAVIGATION LIGHTING UNITS. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

76. LOCK, ELECTRICAL SYSTEM, LOCK, DAM AND NAVIGATION LIGHTING UNITS. February 1938 - Mississippi River 9-Foot Channel Project, Lock & Dam No. 17, Upper Mississippi River, New Boston, Mercer County, IL

151

2. VIEW EAST OF HEADGATES AT SPOOL DAM; DRAIN GATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW EAST OF HEADGATES AT SPOOL DAM; DRAIN GATE MECHANISM AND DAM EDGE AT RIGHT - Willimantic Linen Company, Mill No. 1, Immediately West of South Main Street, North Bank of Willimantic River, Windham, Windham County, CT

152

4. INTERIOR OF THE VALVE HOUSE, DIABLO DAM, SHOWING CONTROLS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. INTERIOR OF THE VALVE HOUSE, DIABLO DAM, SHOWING CONTROLS FOR RELIEF VALVE, 1989. - Skagit Power Development, Diablo Dam, On Skagit River, 6.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

153

19. View of low crib dam, headworks, and tramway above ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. View of low crib dam, headworks, and tramway above dam, looking southeast. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

154

117. Maricopa Dam Water System, Electric Transmission Lines, Catwalk, Derrick ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

117. Maricopa Dam Water System, Electric Transmission Lines, Catwalk, Derrick at Elev. +65. October 15, 1934. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

155

VIEW FROM NORTH BANK LOOKING SOUTHWEST SHOWING DAM CREST, FISH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW FROM NORTH BANK LOOKING SOUTHWEST SHOWING DAM CREST, FISH ATTRACTION FLOW STRUCTURE (LEFT) AND WASTE FLOW GATE OUTLET (RIGHT) - Trout Creek Dam, River Mile 1.8 on Trout Creek, Carson, Skamania County, WA

156

View of Lake Sabrina Dam upstream face from ridge showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of Lake Sabrina Dam upstream face from ridge showing spillway at lower right of photo, view southwest - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

157

23. INTAKE DIVERSION DAM UNDER CONSTRUCTION, FACING NORTHWEST AND DOWNSTREAM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

23. INTAKE DIVERSION DAM UNDER CONSTRUCTION, FACING NORTHWEST AND DOWNSTREAM Photographer: Walter J. Lubken, September 17, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

158

78. POWER CANAL DIVERSION DAM, EXISTING STRUCTURE Courtesy of Dept. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

78. POWER CANAL DIVERSION DAM, EXISTING STRUCTURE Courtesy of Dept. of the Interior, Bureau of Reclamation, Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

159

21. THE WHITNEY CONSTRUCTION CAMP AT THE DIVERSION DAM, FACING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

21. THE WHITNEY CONSTRUCTION CAMP AT THE DIVERSION DAM, FACING SOUTH. WOOD BURNING PLANT AT RIGHT, INTAKE GATES AT CENTER LEFT. Photographer: Walter J. Lubken, June 13, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

160

1. TEMPORARY POWER HOUSE AT ROOSEVELT DAM. TRAMWAY LINES CAN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. TEMPORARY POWER HOUSE AT ROOSEVELT DAM. TRAMWAY LINES CAN BE SEEN AT TOP OF PHOTOGRAPH Photographer: Walter J. Lubken, May 10, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

161

72. ARRANGEMENT OF SLUICE GATES AND HOISTS, DIVERSION DAM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

72. ARRANGEMENT OF SLUICE GATES AND HOISTS, DIVERSION DAM - POWER CANAL Courtesy of U.S.G.S., Reclamation Service, Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

162

73. GENERAL ASSEMBLY OF MECHANISM, FOR OPERATING DIVERSION DAM SLUICE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

73. GENERAL ASSEMBLY OF MECHANISM, FOR OPERATING DIVERSION DAM SLUICE GATES Courtesy of U.S.R.S., Salt River Project - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

163

27. Evening view of downstream face of Pleasant Dam under ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. Evening view of downstream face of Pleasant Dam under construction. Part of construction camp housing is visible in foreground. Photographer unknown, 1927. Source: MWD. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

164

"No. 169. Congressional party visiting the roller crest dam in ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

"No. 169. Congressional party visiting the roller crest dam in 1915. Dedication." - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

165

1. OVERALL VIEW OF UPSTREAM FACE OF DAM; SPILLWAY IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. OVERALL VIEW OF UPSTREAM FACE OF DAM; SPILLWAY IN FOREGROUND, LOCK IN BACKGROUND ON NORTH RIVER BANK. VIEW TO NORTH. - Starved Rock Locks & Dam, Illinois Waterway River mile 231, Peru, La Salle County, IL

166

GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE WITH NORTH END OF RESERVOIR. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

167

GENERAL AERIAL VIEW OF LAKE ALDWELL AND ELWHA DAM AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL AERIAL VIEW OF LAKE ALDWELL AND ELWHA DAM AND POWERHOUSE, WITH STRAIT OF JUAN DE FUCA TO THE NORTH. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

168

22. TWIN FALLS MAIN CANAL HEADWORKS WITH MILNER DAM IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. TWIN FALLS MAIN CANAL HEADWORKS WITH MILNER DAM IN DISTANCE; LOOKING EAST. - Milner Dam & Main Canal: Twin Falls Canal Company, On Snake River, 11 miles West of city of Burley, Idaho, Twin Falls, Twin Falls County, ID

169

23. TWIN FALLS MAIN CANAL HEADWORKS WITH MILNER DAM IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

23. TWIN FALLS MAIN CANAL HEADWORKS WITH MILNER DAM IN DISTANCE; LOOKING NORTHEAST. - Milner Dam & Main Canal: Twin Falls Canal Company, On Snake River, 11 miles West of city of Burley, Idaho, Twin Falls, Twin Falls County, ID

170

5. View of upper dam side sluice taken from east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. View of upper dam side sluice taken from east bank of Millstone Creek. VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

171

3. Side view of upper dam overspill, taken from east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Side view of upper dam overspill, taken from east bank of Millstone Creek. VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

172

1. East side of lower dam shown with water level ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. East side of lower dam shown with water level dropped. VIEW WEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

173

4. Side of view of upper dam overspill, taken from ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Side of view of upper dam overspill, taken from west bank of Millstone Creek, VIEW EAST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

174

3. POOL, DAM, AND INTAKE TO PIPELINE LEADING TO FISH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. POOL, DAM, AND INTAKE TO PIPELINE LEADING TO FISH WHEEL, LOOKING WEST-NORTHWEST. - Santa Ana River Hydroelectric System, Bear Creek Diversion Dam & Confluence Pool, Redlands, San Bernardino County, CA

175

Interior of dam, showing one of the ten bays, looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior of dam, showing one of the ten bays, looking west through arched openings along the center of the dam. - Robert B. Morse Water Filtration Plant, 10700 and 10701 Columbia Pike, Silver Spring, Montgomery County, MD

176

1. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, VIEW OF NORTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, VIEW OF NORTH ELEVATION OF INTAKE ON EAST SIDE OF DAM - Snake River Valley Irrigation District, East Side of Snake River (River Mile 796), Shelley, Bingham County, ID

177

7. ISLAND PLANT AND HORSESHOE DAM FROM WEST BANK (negative ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. ISLAND PLANT AND HORSESHOE DAM FROM WEST BANK (negative reversed) - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

178

20. HORSESHOE DAM LOOKING EAST WITH UPPER END DEMOLISHED FOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. HORSESHOE DAM LOOKING EAST WITH UPPER END DEMOLISHED FOR NEW SPILLWAY (negative reversed) - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

179

1. OVERALL VIEW SHOWING FACE OF CONCRETE GRAVITY DAM AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. OVERALL VIEW SHOWING FACE OF CONCRETE GRAVITY DAM AND FISH LADDER, LOOKING SOUTHWEST (UPSTREAM) FROM SNORE OPPOSITE FISH LADDER - Van Arsdale Dam, South Fork of Eel River, Ukiah, Mendocino County, CA

180

59. AERIAL VIEW OF OWYHEE DAM SHOWING RINGGATE SPILLWAY. VIEW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

59. AERIAL VIEW OF OWYHEE DAM SHOWING RING-GATE SPILLWAY. VIEW TO NORTHEAST. Aerial photo by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, September 29, 1989. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

181

32. Otter Lake Dam. View from downstream show how the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

32. Otter Lake Dam. View from downstream show how the dam blends into its environment. Looking east-northeast. - Blue Ridge Parkway, Between Shenandoah National Park & Great Smoky Mountains, Asheville, Buncombe County, NC

182

Dam-Break Flood Analysis Upper Hurricane Reservoir, Hartford, Vermont.  

National Technical Information Service (NTIS)

The purpose of this study was to determine the downstream hazard potential of the Upper Hurricane Reservoir in Hartford, Vermont. The work was completed for the Vermont Department of Environmental Conservation's Dam Safety Program. Various dam break flood...

S. Acone C. Hatfield

1995-01-01

183

2. EASTSIDE RESERVOIR UNDER CONSTRUCTION LOOKING WEST WITH EAST DAM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EASTSIDE RESERVOIR UNDER CONSTRUCTION LOOKING WEST WITH EAST DAM IN MIDDLE GROUND, WEST DAM IN DISTANCE. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

184

2. SOUTHEAST VIEW OF BIG TUJUNGA DAM SHOWING THE LEFT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SOUTHEAST VIEW OF BIG TUJUNGA DAM SHOWING THE LEFT ABUTMENT WITH THE CONTROL HOUSE IN THE BACKGROUND. PHOTO TAKEN FROM THE ACCESS ROAD. - Big Tujunga Dam, 809 West Big Tujunga Road, Sunland, Los Angeles County, CA

185

6. EASTERLY VIEW OF BIG DALTON DAM SHOWING THE SHELTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EASTERLY VIEW OF BIG DALTON DAM SHOWING THE SHELTER HOUSE IN THE BACKGROUND. PHOTO TAKEN FROM THE ACCESS ROAD LEADING TO THE CONTROL HOUSE. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

186

34. DOWNSTREAM VIEW OF COOLIDGE DAM COMPLETED. POWER HOUSE, INTAKE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

34. DOWNSTREAM VIEW OF COOLIDGE DAM COMPLETED. POWER HOUSE, INTAKE TOWERS, WEST SPILLWAY CHANNEL AND DECORATIVE EAGLES ALL CLEARLY VISIBLE, c. 1928 - Coolidge Dam, Gila River, Peridot, Gila County, AZ

187

Field Experiences in Improving Water Quality Downstream from Dams.  

National Technical Information Service (NTIS)

Recent experiences by the Tennessee Valley Authority in improving water quality and fish habitat downstream from dams are presented. At Douglas Dam, floating pumps near the surface of the large, thermally stratified reservoir are being used to move surfac...

C. E. Bohac E. D. Harshbarger M. H. Mobley

2009-01-01

188

68. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

68. LITTLE ROCK AND PALMDALE IRRIGATION DISTRICT, LITTLE ROCK DAM: STRESS SHEET, SHEET 4; MAY, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

189

71. PALMDALE WATER COMPANY, EASTWOOD MULTIPLEARCHED DAM: STRESS SHEET, SHEET ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

71. PALMDALE WATER COMPANY, EASTWOOD MULTIPLE-ARCHED DAM: STRESS SHEET, SHEET 3; DECEMBER 20, 1918. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

190

2. DOWNSTREAM VIEW OF THE SOUTH CHANNEL DAM, LOOKING WEST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. DOWNSTREAM VIEW OF THE SOUTH CHANNEL DAM, LOOKING WEST. - Washington Water Power Company Post Falls Power Plant, South Channel Dam, West of intersection of Spokane & Fourth Streets, Post Falls, Kootenai County, ID

191

1. UPSTREAM VIEW OF THE SOUTH CHANNEL DAM, LOOKING EAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. UPSTREAM VIEW OF THE SOUTH CHANNEL DAM, LOOKING EAST. - Washington Water Power Company Post Falls Power Plant, South Channel Dam, West of intersection of Spokane & Fourth Streets, Post Falls, Kootenai County, ID

192

1. DIVERSION GATE AT SPILLWAY, NORTH CANAL DAM (DIVERSION GATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. DIVERSION GATE AT SPILLWAY, NORTH CANAL DAM (DIVERSION GATE FEEDING PIPE AT LOWER RIGHT), VIEW TO SOUTHWEST. - North Canal Dam & Diversion Canals, Deschutes Reclamation & Irrigation Company Canal, Empire Boulevard vicinity, Bend, Deschutes County, OR

193

10. DETAIL OF NONOVERFLOW SECTION OF DAM SHOWING PENSTOCK OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. DETAIL OF NON-OVERFLOW SECTION OF DAM SHOWING PENSTOCK OF SUBMERSIBLE TURBINE-GENERATOR - Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15, 3 miles South of Selinsgrove, Selinsgrove, Snyder County, PA

194

7. Detail view of reinforced concrete archrings comprising dam's upstream ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. Detail view of reinforced concrete arch-rings comprising dam's upstream face. Impressions of the wooden formwork used in construction are visible in the concrete. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

195

29. VIEW NORTHWEST ON SHELTON SIDE OF DAM DURING DEWATERING. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. VIEW NORTHWEST ON SHELTON SIDE OF DAM DURING DEWATERING. SHELTON GATEHOUSE IN LEFT CENTER. - Ousatonic Water Power Company, Dam & Canals, CT Routes 34 & 108, 1 mile North of Derby-Shelton Bridge, Derby, New Haven County, CT

196

Simulating dam-breach flood scenarios of the Tangjiashan landslide dam induced by the Wenchuan Earthquake  

NASA Astrophysics Data System (ADS)

Floods from failures of landslide dams can pose a hazard to people and property downstream, which have to be rapidly assessed and mitigated in order to reduce the potential risk. The Tangjiashan landslide dam induced by the Mw = 7.9 2008 Wenchuan earthquake had impounded the largest lake in the earthquake affected area with an estimated volume of 3 × 108 m3, and the potential catastrophic dam breach posed a serious threat to more than 2.5 million people in downstream towns and Mianyang city, located 85 km downstream. Chinese authorities had to evacuate parts of the city until the Tangjiashan landslide dam was artificially breached by a spillway, and the lake was drained. We propose an integrated approach to simulate the dam-breach floods for a number of possible scenarios, to evaluate the severity of the threat to Mianyang city. Firstly, the physically-based BREACH model was applied to predict the flood hydrographs at the dam location, which were calibrated with observational data of the flood resulting from the artificial breaching. The output hydrographs from this model were inputted into the 1-D-2-D SOBEK hydrodynamic model to simulate the spatial variations in flood parameters. The simulated flood hydrograph, peak discharge and peak arrival time at the downstream towns fit the observations. Thus this approach is capable of providing reliable predictions for the decision makers to determine the mitigation plans. The sensitivity analysis of the BREACH model input parameters reveals that the average grain size, the unit weight and porosity of the dam materials are the most sensitive parameters. The variability of the dam material properties causes a large uncertainty in the estimation of the peak flood discharge and peak arrival time, but has little influence on the flood inundation area and flood depth downstream. The effect of cascading breaches of smaller dams downstream of the Tangjiashan dam was insignificant, due to their rather small volumes, which were only 2% of the volume of the Tangjiashan lake. The construction of the spillway was proven to have played a crucial role in reducing the dam-breach flood, because all the other natural breach scenarios would have caused the flooding of the downstream towns and parts of Mianyang city. However, in retrospect improvements on the spillway design and the evacuation planning would have been possible. The dam-break flood risk will be better controlled by reducing the spillway channel gradient and the porosity of the coating of the channel bottom. The experience and lessons we learned from the Tangjiashan case will contribute to improving the hazard mitigation and risk management planning of similar events in future.

Fan, X.; Tang, C. X.; van Westen, C. J.; Alkema, D.

2012-10-01

197

2. View of the southern twothirds of the dam showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. View of the southern two-thirds of the dam showing the Glens Falls Bridge over the Hudson River on the left, the Niagara Mohawk Power Corporation penstocks and inktake structure at the southeast corner of the dam, and the dam itself. The Finch Pruyn & Company Forebay is the foreground. Facing south. - Glens Falls Dam, 100' to 450' West of U.S. Route 9 Bridge Spanning Hudson River, Glens Falls, Warren County, NY

198

33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.  

Code of Federal Regulations, 2010 CFR

...Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208.19 Section...Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. The Secretary...River (entering the Colorado River between Lakes Inks and Lyndon B....

2010-07-01

199

33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.  

Code of Federal Regulations, 2010 CFR

...Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. 208.19 Section...Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex. The Secretary...River (entering the Colorado River between Lakes Inks and Lyndon B....

2009-07-01

200

33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.  

Code of Federal Regulations, 2012 CFR

...Mansfield Dam and Lake Travis), Colorado River, Tex. 208.19 Section 208.19...Mansfield Dam and Lake Travis), Colorado River, Tex. The Secretary of the Interior, through his agent, the Lower Colorado River Authority (LCRA) shall operate the...

2012-07-01

201

33 CFR 208.19 - Marshall Ford Dam and Reservoir (Mansfield Dam and Lake Travis), Colorado River, Tex.  

Code of Federal Regulations, 2011 CFR

...Mansfield Dam and Lake Travis), Colorado River, Tex. 208.19 Section 208.19...Mansfield Dam and Lake Travis), Colorado River, Tex. The Secretary of the Interior, through his agent, the Lower Colorado River Authority (LCRA) shall operate the...

2011-07-01

202

76 FR 34799 - Permanent Dam Safety Modification at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams, TN  

Federal Register 2010, 2011, 2012, 2013

...alternatives for permanent modifications to the existing dam facilities...solutions for dam safety modifications to replace interim modifications that were implemented at...assumes the most extreme weather event reasonably...

2011-06-14

203

20. VIEW FROM DOWNSTREAM SIDE OF DAM SHOWING BUTTS OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. VIEW FROM DOWNSTREAM SIDE OF DAM SHOWING BUTTS OF LOGS PROJECTING BETWEEN CROSS LOGS. FREQUENTLY WHOLE TREES WERE USED IN CONSTRUCTING THESE DAMS. THE BRANCHES WERE PLACED UPSTREAM AND COVERED WITH EARTH AND STONE TO ANCHOR THEM. Photographed November 6, 1935. - Forge Creek Dam-John Cable Mill, Townsend, Blount County, TN

204

LOCK, DOG HOUSE, CONTROL STATION, DAM GATE, MANEUVER BOAT No. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

LOCK, DOG HOUSE, CONTROL STATION, DAM GATE, MANEUVER BOAT No. 1, AND DAM. NOTE LOWER LOCK GATE IN FOREGROUND. LOOKING NORTH NORTHEAST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

205

77 FR 50493 - Sam Rayburn Dam Project Power Rate  

Federal Register 2010, 2011, 2012, 2013

...Southwestern Power Administration Sam Rayburn Dam Project Power Rate AGENCY: Southwestern...SUMMARY: The current Sam Rayburn Dam Project rate was approved by the Federal...with the Sam Rayburn and Robert D. Willis Dams, two Corps projects that are isolated...

2012-08-21

206

75 FR 34476 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group AGENCY...renewing the charter for the Glen Canyon Dam Adaptive Management Work Group. The purpose...respect to the operation of Glen Canyon Dam and the exercise of other authorities...

2010-06-17

207

75 FR 50777 - Minidoka Dam Spillway Replacement, Minidoka County, ID  

Federal Register 2010, 2011, 2012, 2013

...Reclamation [INT-FES 10-43] Minidoka Dam Spillway Replacement, Minidoka County...prepared a FEIS on the proposed Minidoka Dam Spillway Replacement. The U.S. Fish...be submitted electronically to minidoka_dam_eis@usbr.gov. FOR FURTHER...

2010-08-17

208

22. THE DIVERSION DAM UNDER CONSTRUCTION AT THE INTAKE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. THE DIVERSION DAM UNDER CONSTRUCTION AT THE INTAKE OF THE SALT RIVER POWER CANAL, SHOWING COMPLETED APRON OF DAM IN MAIN CHANNEL OF RIVER BED. Photographer: Walter J. Lubken, October 17, 1906 - Roosevelt Power Canal & Diversion Dam, Parallels Salt River, Roosevelt, Gila County, AZ

209

2. VIEW SHOWING UPSTREAM FACE OF DAM, WITH UPRIGHT (INOPERABLE) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW SHOWING UPSTREAM FACE OF DAM, WITH UPRIGHT (INOPERABLE) OUTLET GATE, LOOKING WEST - High Mountain Dams in Upalco Unit, Water Lily Lake Dam, Ashley National Forest, 1.1 miles Northeast of Swift Creek Campground, Mountain Home, Duchesne County, UT

210

3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH UPRIGHT (INOPERABLE) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW SHOWING UPSTREAM FACE OF DAM, WITH UPRIGHT (INOPERABLE) OUTLET GATE, LOOKING EAST - High Mountain Dams in Upalco Unit, Water Lily Lake Dam, Ashley National Forest, 1.1 miles Northeast of Swift Creek Campground, Mountain Home, Duchesne County, UT

211

2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN TAN FLOOD-WATER HEADGATE IN FOREGROUND. TAKEN FROM NORTH END OF DAM - San Carlos Irrigation Project, Sacaton Dam & Bridge, Gila River, T4S R6E S12/13, Coolidge, Pinal County, AZ

212

1. East apron upper dam with water flowing over overspill. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. East apron upper dam with water flowing over overspill. Photograph taken from crest of lower dam in foreground). VIEW WEST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

213

1 NONLINEAR SEISMIC ANALYSIS OF SWEETWATER MAIN DAM  

Microsoft Academic Search

This paper presents the results of advanced seismic analysis of Sweetwater Main Dam (Sweetwater Dam), a 118-foot-high curved concrete gravity dam owned and operated by Sweetwater Authority, Chula Vista, CA. Linear-elastic finite element analysis of the maximum cross-section was performed using the \\

Gilles Bureau; G. E. Scott; W. McClelland

214

1. VIEW OF DOWNSTREAM SIDE OF DIVERSION DAM ON THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW OF DOWNSTREAM SIDE OF DIVERSION DAM ON THE SNAKE RIVER, LOOKING NORTHEAST. NOTE HEADGATE STRUCTURE ON NORTH BANK, SPILLWAY ON LEFT SIDE OF DAM, AND SPLASH LOGS ON DOWNSTREAM SIDE OF DAM. - Snake River Ditch, Headgate on north bank of Snake River, Dillon, Summit County, CO

215

View of upstream face of the forebay dam of Grand ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of upstream face of the forebay dam of Grand Coulee Dam, looking southwest. Note the trash racks at the entrance to the penstocks. - Columbia Basin Project, Grand Coulee Dam & Franklin D. Roosevelt Lake, Across Columbia River, Southeast of Town of Grand Coulee, Grand Coulee, Grant County, WA

216

Problems of quality control in constructing earth dams  

Microsoft Academic Search

Conclusion 1.Current methods of conducting geotechnical control when constructing high earth dams do not have effective criteria for evaluating the technology and therefore they cannot provide real quality control of dam construction.2.A system of controlling the quality of constructing earth dams with the use of the technology safety factor analogous to the soil safety factor, realizing feedback of geotechnical control

A. G. Chernilov

1987-01-01

217

77. AVALON DAM Photographic copy of map dated 1895 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

77. AVALON DAM - Photographic copy of map dated 1895 (from Record Group 49, Division F, National Archives, Washington, D.C.) PLAT OF RESERVOIR NO. 2 BEING THE DISTRIBUTING RESERVOIR OF THE PECOS IRRIGATION AND IMPROVEMENT CO'S SOUTHERN CANAL SYSTEM INCLUDES PLAN AND CROSS SECTION OF DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

218

Shape optimal design of materially nonlinear arch dams including dam-water-foundation rock interaction using an improved PSO algorithm  

Microsoft Academic Search

An efficient optimization procedure is proposed to find the optimal shape of arch dams including dam-water-foundation rock\\u000a interaction subject to earthquake. The arch dam is treated as a three-dimensional structure involving the material nonlinearity\\u000a effects. For this purpose, the nonlinear behavior of the dam concrete is idealized as an elasto-plastic material using the\\u000a Drucker-Prager model. In order to reduce the

Seyed Mohammad Seyedpoor; Javad Salajegheh; Eysa Salajegheh

219

Expression analysis of PpDAM5 and PpDAM6 during flower bud development in peach ( Prunus persica)  

Microsoft Academic Search

We previously reported transcript amounts of peach PpDAM5 and PpDAM6 (Prunus persica Dormancy-Associated MADS 5 and 6) were negatively correlated with endodormancy release of peach vegetative buds (Yamane et al., 2011). We here investigated PpDAM5 and PpDAM6 expressions in lateral flower buds of peach in relation to seasonal flower bud development by using peach cultivars differing in their chilling requirements,

Hisayo Yamane; Tomomi Ooka; Hiroaki Jotatsu; Ryuta Sasaki; Ryutaro Tao

2011-01-01

220

Federal Guidelines for Dam Safety: Earthquake Analyses and Design of Dams.  

National Technical Information Service (NTIS)

These guidelines provide the basic framework for the earthquake design and evaluation of dams. The general philosophy and principles for each part of the framework are described in sufficient detail to achieve a reasonable degree of uniform application am...

2005-01-01

221

Dams and Salmon: A Northwest Choice  

ERIC Educational Resources Information Center

This article describes an experiential exercise in which participants assume the roles of various stakeholder groups in the controversy surrounding possible dam removal to revive northwestern U. S. salmon populations. The role-play (a) increases environmental awareness in the context of the competing interests various stakeholders have in our…

Tucker, Michael; Tromley, Cheryl L.

2005-01-01

222

Aging Dams and Watersheds: Rehabilitation and Restoration  

NSDL National Science Digital Library

The US Department of Agriculture's Water Quality Information Center at the National Agricultural Library has placed a new database online. The bibliography on Aging Dams and Watersheds includes 33 citations (1984-1998) "intended primarily to provide awareness of recent investigations and discussions" of related topics; several citations are hyperlinked to the full-text articles.

223

Developments in Concrete Dam Construction in Turkey.  

National Technical Information Service (NTIS)

Economic exploitation of Turkey's water resources requires construction of about 600 dams. One-fifth of them are in operation, one-tenth under construction, one-eighth are at the stage of final design and more than half of them are only at the planning st...

U. Oezis M. Alsan

1990-01-01

224

Eye in the Sky: Floods and Dams  

NSDL National Science Digital Library

This site provides general information about floods and dams. There are sections on the science, the phenomenon, and effects of floods. One video clip shows the Mississippi River at flood and non-flood levels. Another clip shows actual footage of a flood wreaking havoc on a populated area.

225

Boca Dam Collapse Feature Investigation, Trip Report.  

National Technical Information Service (NTIS)

The purpose of the report is: 1. To conduct investigations of the collapse feature identified in MP-230's April 28, 2008 Earthquake Inspection Trip Report for Boca and Stampede Dams, to the left of the spillway, downhill from the toe of the dike. 2. To de...

G. Egan M. McCulla

2008-01-01

226

Groundwater pollution due to a tailings dam  

Microsoft Academic Search

In 1982, the Oman Mining Company (OMC) commenced copper mining and smelting operations in the area of Sohar (Wadi Suq), Sultanate of Oman. Seawater was used for mining operations until 1993. During this period, 11 million tonnes of tailings had been deposited behind an unlined tailings dam. This has resulted in a major groundwater pollution problem.This paper presents results from

R. S Sharma; T. S Al-Busaidi

2001-01-01

227

Hyraulic Model Studies Yellowtail Afterbay Dam Sluiceway.  

National Technical Information Service (NTIS)

The purpose of this study was to determine the best location for installing a flow deflector to reduce gas supersaturation below Yellowtail Afterbay Dam. Supersaturation occurs when entrained air in the hydraulic jump is carried to depth in the stilling b...

M. F. Young

1982-01-01

228

National Program for Inspection of Non-Federal Dams. Richville Dam (VT 00074) Richelieu River Basin, Shoreham, Vermont.  

National Technical Information Service (NTIS)

The dam is a concrete gravity dam with an overall length of 116 ft. and a height of 15 ft. It is small in size with a low hazard potential. The dam is in good condition. There are a few items which need maintenance and repair. (Author)

1978-01-01

229

Experimental Research on the Dam-Break Mechanisms of the Jiadanwan Landslide Dam Triggered by the Wenchuan Earthquake in China  

PubMed Central

Dam breaks of landslide dams are always accompanied by large numbers of casualties, a large loss of property, and negative influences on the downstream ecology and environment. This study uses the Jiadanwan landslide dam, created by the Wenchuan earthquake, as a case study example. Several laboratory experiments are carried out to analyse the dam-break mechanism of the landslide dam. The different factors that impact the dam-break process include upstream flow, the boulder effect, dam size, and channel discharge. The development of the discharge channel and the failure of the landslide dam are monitored by digital video and still cameras. Experimental results show that the upstream inflow and the dam size are the main factors that impact the dam-break process. An excavated discharge channel, especially a trapezoidal discharge channel, has a positive effect on reducing peak flow. The depth of the discharge channel also has a significant impact on the dam-break process. The experimental results are significant for landslide dam management and flood disaster prevention and mitigation.

Xu, Fu-gang; Yang, Xing-guo; Hao, Ming-hui

2013-01-01

230

National Dam Safety Program. Kooglers Dam (Inventory Number VA 16305), James River Basin, Rockbridge County, Virginia. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The Dam is an earthfill structure about 1000 feet long and 23.3 feet high with a gravel roadway traversing the entire dam. The dam is classified as small on the basis of size, and given a hazard classification of significant on the basis of downstream are...

B. O. Taran

1981-01-01

231

National Dam Safety Program. Turner Dam (Inventory Number VA 16308), James River Basin, Rockbridge County, Virginia. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam is an earthfill structure about 800 feet long and 45.2 feet high. The dam is classified as an intermediate size dam with a significant hazard classification. The designed principal spillway is a 10-inch steel drop-inlet stand pipe located in the r...

B. O. Taran

1981-01-01

232

National Dam Safety Program. Seneca Falls Dam, Seneca River Basin, Seneca River, Seneca County, New York. Phase I Inspection Report.  

National Technical Information Service (NTIS)

This report provides information and analysis on the physical condition of the dam as of the report date. Information and analysis are based on visual inspection of the dam by the performing organization. Seneca Falls Dam was found to be unsafe-non emerge...

J. J. Williams

1978-01-01

233

Seismic risk ranking for large dams in South Africa  

NASA Astrophysics Data System (ADS)

Earthquake motion is one of the extreme loads acting on large dams. Dam owners and regulators must therefore ensure that dams are safely operated and present minimal risk to the public in case of extreme loads such as floods and earthquakes. Owners of many dams or officials in charge of dam safety programs may consider comparative assessment of the seismic risk associated with their dams and establish priorities for detailed evaluation. South Africa has in excess of 100 large state-owned dams and the characteristics of these dams have been used to perform a basic seismic hazard assessment and rank the vulnerability of these dams from the lowest to highest. One of the most decisive factors that contributes to the risk of a dam is the wall type; with gravity and earthfill dams being the most vulnerable to earthquake motion. Another aspect that needs further investigation is the downstream hazard potential which, if known to a better degree of accuracy, can provide more reasonable estimates of the risk factors.

Singh, Mayshree; Kijko, Andrzej; van den Berg, Leo

2011-02-01

234

Spectroscopy of MPS(3):DAMS(+) composite materials  

NASA Astrophysics Data System (ADS)

Composite materials are comprised of two separate components that are brought together to form a new material that exhibits unique properties not found in the individual components. The composite material studied in this work is a guest dye cation, (4-[4-(dimethylamino)-alpha-styrl]-1-methylpyridinium) or DAMS+, intercalated into an inorganic host lattice (MPS 3, where M = Cd2+ or Mn2+). MPS3 :DAMS+ exhibits high-efficiency second-harmonic generation (SHG), which is only observed when a material lacks a center of symmetry. There must be an organization of dye molecules upon intercalation to induce the noncentrosymmetry necessary for SHG. The formation of dye aggregates will be studied as a possible noncentrosymmetric arrangement. The intercalated materials (MPS3:DAMS+) exhibited spectral features of J-aggregates. These features included a sharp aggregate absorption and emission band, known as the J-band. There was a small Stokes shift (250 cm-1) between aggregate absorption and emission bands, and a red-shift between the J-band and isolated dye absorption band (3,700 cm-1). The low-energy tail of the emission J-band was theoretically modeled using the Urbach-Martienssen equation, while the high-energy states were fit to a Gaussian to determine aggregate disorder. Disorder was also modeled using a Monte-Carlo lineshape analysis program. From these theoretical models, the aggregate was found to be two-dimensional and weakly coupled. A variety of sample types were studied including intercalated powders and single crystals using absorbance, reflectance and emission spectroscopy. Reflectance spectra were directly compared with absorbance spectra using the Kramers-Kronig Transformation2 to determine that the surface aggregates and the interior aggregates were structurally similar. A new imaging microspectrophotometer was developed to investigate the topology of the composite materials. Kinetics of the intercalation front were studied and a layer-by-layer intercalation mechanism was developed. Surface studies using other materials indicated the polyanion nature of MPS3 :DAMS+ was essential for aggregation. Infrared microspectroscopy was used to determine the orientation of dye molecules on the surface of the large composite crystals. The DAMS+ in MPS 3:DAMS+ was shown to form two-dimensional brickwork aggregates with the molecules aligned "edge-on" on the surface and interior of the host lattice.

Holt, Jennifer Suzanne

235

Dam removal increases American eel abundance in distant headwater streams  

USGS Publications Warehouse

American eel Anguilla rostrata abundances have undergone significant declines over the last 50 years, and migration barriers have been recognized as a contributing cause. We evaluated eel abundances in headwater streams of Shenandoah National Park, Virginia, to compare sites before and after the removal of a large downstream dam in 2004 (Embrey Dam, Rappahannock River). Eel abundances in headwater streams increased significantly after the removal of Embrey Dam. Observed eel abundances after dam removal exceeded predictions derived from autoregressive models parameterized with data prior to dam removal. Mann–Kendall analyses also revealed consistent increases in eel abundances from 2004 to 2010 but inconsistent temporal trends before dam removal. Increasing eel numbers could not be attributed to changes in local physical habitat (i.e., mean stream depth or substrate size) or regional population dynamics (i.e., abundances in Maryland streams or Virginia estuaries). Dam removal was associated with decreasing minimum eel lengths in headwater streams, suggesting that the dam previously impeded migration of many small-bodied individuals (<300 mm TL). We hypothesize that restoring connectivity to headwater streams could increase eel population growth rates by increasing female eel numbers and fecundity. This study demonstrated that dams may influence eel abundances in headwater streams up to 150 river kilometers distant, and that dam removal may provide benefits for eel management and conservation at the landscape scale.

Hitt, Nathaniel P.; Eyler, Sheila; Wofford, John E. B.

2012-01-01

236

The geomorphic influences of beaver dams and failures of beaver dams  

NASA Astrophysics Data System (ADS)

Uncounted millions of beaver ponds and dams existed in North America prior to European contact and colonization. These ponds acted as sediment traps that contained tens to hundreds of billions of cubic meters of sediment that would otherwise have passed through the fluvial system. Removal of beavers by overtrapping in the 16th-19th centuries severely reduced their number and the number of ponds and dams. Dam removal altered the fluvial landscape of North America, inducing sediment evacuation and entrenchment in concert with widespread reduction in the wetlands environments. Partial recovery of beaver populations in the 20th century has allowed reoccupation of the entirety of the pre-contact range, but at densities of only one-tenth the numbers. Nevertheless, modern beaver ponds also trap large volumes of sediment in the high hundred millions to low billions of cubic meters range. Failure of beaver dams is a more common phenomenon than often assumed in the literature. During the past 20 years, numerous cases of dam failure have been documented that resulted in outburst floods. These floods have been responsible for 13 deaths and numerous injuries, including significant impacts on railway lines.

Butler, David R.; Malanson, George P.

2005-10-01

237

Distribution and prevention of dammed lakes triggered by Wenchuan earthquake  

NASA Astrophysics Data System (ADS)

Wenchuan earthquake induced large-scale of collapses and landslides which blocked river channels and brought about quantities of dammed lakes. The number and the scale of dammed lakes are extremely rare in the world. Besides the backwater of the dammed lakes can flood the road traffic, villages and farmland on the upstream, it can severely threaten the safety of the people's lives and properties on the downstream. Once the dammed lakes burst out, they can cause severe flood disaster. Therefore, it is urgent to monitor the dammed lakes, study their distribution and analyze their development by means of remote sensing (RS) and geography information system (GIS) after the earthquake. In this paper, 145 high-resolution images were processed and 31 severely-afflicted counties were studied through RS monitoring and field investigation. By the time of May 28,2008, 257 dammed lakes existing more than 14 days were identified and there were 34 dammed lakes with capacity of more than 100 000m3. Based on these conditions, the distribution and development of dammed lakes were discussed and the findings showed that: (a) The dammed lakes induced by Wenchuan earthquake mainly scatter in Beichuan, Wenchuan, Shifang, Mianzhu and Anxian counties, and there exist 154 dammed lakes in these regions, which is 59.92 percent of the total. (b) 95.3 percent of the dammed lakes are within 10km of three major fault zones of Longmen Mountains and the relationship between the number of dammed lakes and their distance to fault zone accords with the law of logarithmic decrement. (c) Most of dammed lakes are distributed in the upper reaches of Minjiang River, Tuojiang River, Jianjiang River and Fujiang River, etc. in rosary. (d) The distribution of dammed lakes in the study areas is dominated by seismic intensity, lithology, slope and altitude. In the next 5-10 years, collapses, landslides and debris flows in the study area will occur frequently and severely and they are likely to block river channels and form dammed lakes. As rainy season comes, the risk of dammed lakes forming and bursting is increasing. So it is necessary to reinforce the real-time monitoring of dammed lakes, make risk assessment and formulate the emergency countermeasures.

Han, Yongshun; Liu, Hongjiang; Zhu, Boqin; Han, Jun; Yang, Yingchang; Zhang, Yu

2009-09-01

238

Dams and Rivers: A Primer on the Downstream Effects of Dams  

USGS Publications Warehouse

The U.S. Geological Survey is charged with monitoring the water and mineral resources of the United States. Beginning in 1889, the Survey established a network of water gaging stations across most of the country's rivers; some also measured sediment content of the water. Consequently, we now have valuable long-term data with which to track water supply, sediment transport, and the occurrence of floods. Many variables affect the flow of water from mountain brook to river delta. Some are short-term perturbations like summer thunderstorms. Others occur over a longer period of time, like the El Ninos that might be separated by a decade or more. We think of these variables as natural occurrences, but humans have exerted some of the most important changes -- water withdrawals for agriculture, inter-basin transfers, and especially the construction of an extensive system of dams. Dams have altered the flow of many of the Nation's rivers to meet societal needs. We expect floods to be contained. Irrigation is possible where deserts once existed. And water is released downstream not according to natural cycles but as dictated by a region's hour-by-hour needs for water or electricity. As a result, river channels below dams have changed dramatically. Depending on annual flow, flood peaks, and a river's sediment load, we might see changes such as sand building up in one channel, vegetation crowding into another, and extensive bank erosion in another. This Circular explores the emerging scientific arena of change in rivers below dams. This science tries first to understand and then anticipate changes to river beds and banks, and to riparian habitats and animal communities. To some degree, these downstream changes can be influenced by specific strategies of dam management. Scientists and resource managers have a duty to assemble this information and present it without bias to the rest of society. Society can then more intelligently choose a balance between the benefits and adverse downstream effects of dams.

Collier, Michael; Webb, Robert H.; Schmidt, John C.

1996-01-01

239

Oblique view, looking west, of top side of diversion dam, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Oblique view, looking west, of top side of diversion dam, also showing eastern profiles of piers and gatehouses. Roller gate (raised position) on right. Note detail of extension shield that, when lowered to a secure position against the dam sill, creates a virtually impervious seal - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

240

Characterization of landslide dams in the San Juan province (Argentina)  

NASA Astrophysics Data System (ADS)

River blockages caused by landslide deposition are common phenomena in active mountain chains, influencing erosion-sedimentation patterns and acting as primary and secondary hazards. Regional scale analyses regarding their spatial distribution and morphometry allow establishing boundary conditions for their occurrence and stability, and determine differences among regions with different landscape and climatic conditions. Owing to the combination of endogenous and exogenous factors, landslide dams are frequent phenomena in the Andes. In the Argentinean NW and the Patagonian Andes, previous studies showed that stability of landslide dams determined by morphometric parameters generally matched satisfactorily with dam behavior, with some exceptions in which climatic component played an important role in dam longevity. Aiming to expand the knowledge of landslide dams in the Argentinean Andes, in this work we analyzed the stability of rock avalanche dams in the Pampeam flat slab subduction zone. In the study area, mountain dynamics creates suitable conditions for the occurrence of 34 rock avalanches with volumes up to 0.3 km3. They developed in deeply carved valleys (Cordillera) and Inter-thrust valleys (Precordillera). 22 impoundments of rivers resulted from channelized rock avalanches with long runouts (4-10 km) that blocked tributaries rivers, but most of them by rock avalanches that filled the valley bottom, with run up in the opposite slope and limited movement parallel to the valley axis. Most of the dams breached in unknown times, except for the last event that occurred on November 12th 2005. The quantification of morphometric parameters and contributing areas indicates the existence of dams with dimensionless blockage index above 2.75 (stable domain) and below 3.08 (instable domain). The Los Erizos dam in our study area and the Barrancas dam in the Patagonian Andes show that besides morphometric parameters, climatic conditions are decisive. Stable landslide dams lasting for millennia can collapse suddenly due to anomalous weather conditions, and unstable dams can have a higher longevity depending on the season controlling the inflow into the lake.

Penna, Ivanna; Longchamp, Celine; Derron, Marc-Henri; Jaboyedoff, Michel

2013-04-01

241

Experimental investigation of dynamic pressure loads during dam break  

NASA Astrophysics Data System (ADS)

The objectives of this work are to revisit the experimental measurements on dam break flow over a dry horizontal bed and to provide a detailed insight into the dynamics of the dam break wave impacting a vertical wall downstream the dam, with emphasis on the pressure loads. The measured data are statistically analyzed and critically discussed. As a result, an extensive set of data for validation of computational tools is provided.

Lobovský, L.; Botia-Vera, E.; Castellana, F.; Mas-Soler, J.; Souto-Iglesias, A.

2014-07-01

242

Dynamic analysis of an inflatable dam subjected to a flood  

Microsoft Academic Search

A dynamic simulation of the response of an inflatable dam subjected to a flood is carried out to determine the survivability\\u000a envelope of the dam where it can operate without rupture, or overflow. The free-surface flow problem is solved in two dimensions\\u000a using a fully nonlinear mixed Eulerian-Lagrangian formulation. The dam is modeled as an elastic shell inflated with air

K. Lowery; S. Liapis

1999-01-01

243

1. CONTEXTUAL VIEW OF THE NORTH CHANNEL DAM FROM PUBLICLY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. CONTEXTUAL VIEW OF THE NORTH CHANNEL DAM FROM PUBLICLY RESTRICTED PROPERTY OF THE RECENTLY CLOSED LOUISIANA PACIFIC LUMBER MILL. THE NORTH CHANNEL DAM'S HOLDING RESERVOIR AND TAINTER GATES ARE IN THE FOREGROUND, AND THE ROLLING SECTOR GATE IS IN THE BACKGROUND, LOOKING EAST. - Washington Water Power Company Post Falls Power Plant, North Channel Dam, West of intersection of Spokane & Fourth Streets, Post Falls, Kootenai County, ID

244

5. EASTSIDE RESERVOIR, LOOKING WEST. WEST DAM UNDER CONSTRUCTION, QUARRIES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EASTSIDE RESERVOIR, LOOKING WEST. WEST DAM UNDER CONSTRUCTION, QUARRIES TO LEFT MIDDLE GROUND OF PICTURE. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

245

2. FORMER INTAKE DAM NO. 2 AT 560" CONSTRUCTED OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. FORMER INTAKE DAM NO. 2 AT 560" CONSTRUCTED OF RUBBLE MASONRY IN 1937-1938. VIEW LOOKING DOWN LINE FORMER INTAKE GRILLE WAS TO LEFT SIDE OF DAM (TWO 8" IRON PIPES FROM NEW INTAKE NOW ENTER OLD INTAKE OPENING), BOX FLUME EXITS AT RIGHT AND CARRIES WATER TO AERATOR. NOTE THE SMALL SLUICEWAY OPENING AT CENTER ALONG WATERLINE. THIS DAM WAS SUPERCEDED BY THE NEW INTAKE DAM TO REACH THE MORE RELIABLE WATER SOURCE OF THE MAIN STREAM. - Kalaupapa Water Supply System, Waikolu Valley to Kalaupapa Settlement, Island of Molokai, Kalaupapa, Kalawao County, HI

246

National Program for Inspection of Non-Federal Dams. Big Island Pond Dam (NH 470), Merrimack River Basin, Derry, New Hampshire. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam is a stone masonry dam with earth abutments. The dam is 80 ft. long with a maximum height of 10 ft. The dam has an irregular configuration, having experienced various modifications and repairs. It is considered to be in the significant hazard cate...

1978-01-01

247

Dam Design can Impede Adaptive Management of Environmental Flows: A Case Study from the Opuha Dam, New Zealand  

NASA Astrophysics Data System (ADS)

The Opuha Dam was designed for water storage, hydropower, and to augment summer low flows. Following its commissioning in 1999, algal blooms (dominated first by Phormidium and later Didymosphenia geminata) downstream of the dam were attributed to the reduced frequency and magnitude of high-flow events. In this study, we used a 20-year monitoring dataset to quantify changes associated with the dam. We also studied the effectiveness of flushing flows to remove periphyton from the river bed. Following the completion of the dam, daily maximum flows downstream have exceeded 100 m3 s-1 only three times; two of these floods exceeded the pre-dam mean annual flood of 203 m3 s-1 (compared to 19 times >100 m3 s-1 and 6 times >203 m3 s-1 in the 8 years of record before the dam). Other changes downstream included increases in water temperature, bed armoring, frequency of algal blooms, and changes to the aquatic invertebrate community. Seven experimental flushing flows resulted in limited periphyton reductions. Flood wave attenuation, bed armoring, and a shortage of surface sand and gravel, likely limited the effectiveness of these moderate floods. Floods similar to pre-dam levels may be effective for control of periphyton downstream; however, flushing flows of that magnitude are not possible with the existing dam infrastructure. These results highlight the need for dams to be planned and built with the capacity to provide the natural range of flows for adaptive management, particularly high flows.

Lessard, JoAnna; Murray Hicks, D.; Snelder, Ton H.; Arscott, David B.; Larned, Scott T.; Booker, Doug; Suren, Alastair M.

2013-02-01

248

Dam design can impede adaptive management of environmental flows: a case study from the Opuha Dam, New Zealand.  

PubMed

The Opuha Dam was designed for water storage, hydropower, and to augment summer low flows. Following its commissioning in 1999, algal blooms (dominated first by Phormidium and later Didymosphenia geminata) downstream of the dam were attributed to the reduced frequency and magnitude of high-flow events. In this study, we used a 20-year monitoring dataset to quantify changes associated with the dam. We also studied the effectiveness of flushing flows to remove periphyton from the river bed. Following the completion of the dam, daily maximum flows downstream have exceeded 100 m(3) s(-1) only three times; two of these floods exceeded the pre-dam mean annual flood of 203 m(3) s(-1) (compared to 19 times >100 m(3) s(-1) and 6 times >203 m(3) s(-1) in the 8 years of record before the dam). Other changes downstream included increases in water temperature, bed armoring, frequency of algal blooms, and changes to the aquatic invertebrate community. Seven experimental flushing flows resulted in limited periphyton reductions. Flood wave attenuation, bed armoring, and a shortage of surface sand and gravel, likely limited the effectiveness of these moderate floods. Floods similar to pre-dam levels may be effective for control of periphyton downstream; however, flushing flows of that magnitude are not possible with the existing dam infrastructure. These results highlight the need for dams to be planned and built with the capacity to provide the natural range of flows for adaptive management, particularly high flows. PMID:23124551

Lessard, JoAnna; Hicks, D Murray; Snelder, Ton H; Arscott, David B; Larned, Scott T; Booker, Doug; Suren, Alastair M

2013-02-01

249

33 CFR 222.6 - National Program for Inspection of Non-Federal Dams.  

Code of Federal Regulations, 2013 CFR

...generally applicable to rockfill dams and to earth dams on foundations containing weak...of the dam and within the foundation; earth and silt loads; ice pressure...and abutments (concrete, rock, grass, earth) and length of limited service and...

2013-07-01

250

75 FR 439 - Glen Canyon Dam Adaptive Management Work Group (AMWG)  

Federal Register 2010, 2011, 2012, 2013

...INTERIOR Bureau of Reclamation Glen Canyon Dam Adaptive Management Work Group (AMWG...SUMMARY: The Glen Canyon Dam Adaptive Management Program (AMP) was...Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement...

2010-01-05

251

78 FR 54482 - Charter Renewal, Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...4073000] Charter Renewal, Glen Canyon Dam Adaptive Management Work Group AGENCY...renewing the charter for the Glen Canyon Dam Adaptive Management Work Group. The purpose...concerning the operation of Glen Canyon Dam and the exercise of other authorities...

2013-09-04

252

78 FR 35630 - Martin Dam Hydroelectric Project; Notice of Availability of the Draft Environmental Impact...  

Federal Register 2010, 2011, 2012, 2013

...Project No. 349-173] Martin Dam Hydroelectric Project; Notice of Availability of...Impact Statement for the Martin Dam Hydroelectric Project and Intention To Hold Public...application for license for the Martin Dam Hydroelectric Project (FERC No. 349),...

2013-06-13

253

77 FR 14516 - Alabama Power Company, Martin Dam Hydroelectric Project; Notice of Proposed Revised Restricted...  

Federal Register 2010, 2011, 2012, 2013

...Alabama Power Company, Martin Dam Hydroelectric Project; Notice of Proposed Revised...of Historic Places at the Martin Dam Hydroelectric Project. The Programmatic Agreement...pursuant to section 106 for the Martin Dam Hydroelectric Project would be fulfilled...

2012-03-12

254

Seismic Stability Evaluation of Folsom Dam and Reservoir Project. Report 6. Right and Left Wing Dams.  

National Technical Information Service (NTIS)

The man-made water retaining structures at the Folsom Dam and Reservoir Project, located on the American River about 20 miles upstream of the city of Sacramento, California, have been evaluated for their seismic safety in the event of a Magnitude 6.5 eart...

D. E. Yule D. J. Elton M. E. Hynes R. E. Wahl

1989-01-01

255

Seismic Stability Evaluation of Folsom Dam and Reservoir Project. Report 3. Concrete Gravity Dam.  

National Technical Information Service (NTIS)

The man-made water retaining structures at the Folsom Dam and Reservoir Project, located on the American River about 20 miles upstream of the City of Sacramento, CA, have been evaluated for their seismic safety in the event of a magnitude 6.5 earthquake o...

J. M. Nau R. L. Hall S. C. Woodson

1989-01-01

256

Dams. Bulletin of the Technical Service of Electric Power and Big Dams.  

National Technical Information Service (NTIS)

Three papers were selected in this issue of the bulletin of the Technical Service of Electric Power and Big Dams. The first one concerns the experience feedback gained from the accident of the Drac river near Grenoble (France) due to a spillover at the No...

1996-01-01

257

Hydrology, geomorphology, and dam-break modeling of the July 15, 1982, Lawn Lake Dam and Cascade Lake Dam failures, Larimer County, Colorado  

USGS Publications Warehouse

On July 15, 1982, Lawn Lake Dam, a 26-foot-high earthfill irrigation dam built in 1903 in Rocky Mountain National Park, Colorado, failed, due to piping, releasing 674 acre-feet of water with a peak discharge of 18,000 cubic feet per second down the Roaring River. Three people were killed, and damages were estimated at $31 million. Cascade Lake Dam, downstream from Lawn Lake Dam, subsequently failed as a result of the flood, increasing the peak flow at this point from 7,210 cubic feet per second to 16,000 cubic feet per second. The flood wave took 3.28 hours to travel 12.5 miles to Lake Estes, where all the floodwater was stored. The channel of the Roaring River was scoured as much as 50 feet and widened 300 feet. An alluvial fan of 42.3 acres, containing 10 million cubic feet of material, was deposited at the mouth of the Roaring River, damming the Fall River and forming a 17-acre lake. Various methods were used to indirectly compute peak discharge, attenuation of flow, and flood traveltime. A version of the National Weather Service dam-break flood model was used to evaluate its performance on high-gradient streams, to provide supplemental hydrologic information, and to evaluate various scenarios of dam-break development. (USGS)

Jarrett, R. D.; Costa, J. E.

1984-01-01

258

Earthquake safety assessment of concrete arch and gravity dams  

NASA Astrophysics Data System (ADS)

Based on research studies currently being carried out at Dalian University of Technology, some important aspects for the earthquake safety assessment of concrete dams are reviewed and discussed. First, the rate-dependent behavior of concrete subjected to earthquake loading is examined, emphasizing the properties of concrete under cyclic and biaxial loading conditions. Second, a modified four-parameter Hsieh-Ting-Chen viscoplastic consistency model is developed to simulate the rate-dependent behavior of concrete. The earthquake response of a 278m high arch dam is analyzed, and the results show that the strain-rate effects become noticeable in the inelastic range. Third, a more accurate non-smooth Newton algorithm for the solution of three-dimensional frictional contact problems is developed to study the joint opening effects of arch dams during strong earthquakes. Such effects on two nearly 300m high arch dams have been studied. It was found that the canyon shape has great influence on the magnitude and distribution of the joint opening along the dam axis. Fourth, the scaled boundary finite element method presented by Song and Wolf is employed to study the dam-reservoir-foundation interaction effects of concrete dams. Particular emphases were placed on the variation of foundation stiffness and the anisotropic behavior of the foundation material on the dynamic response of concrete dams. Finally, nonlinear modeling of concrete to study the damage evolution of concrete dams during strong earthquakes is discussed. An elastic-damage mechanics approach for damage prediction of concrete gravity dams is described as an example. These findings are helpful in understanding the dynamic behavior of concrete dams and promoting the improvement of seismic safety assessment methods.

Lin, Gao; Hu, Zhiqiang

2005-12-01

259

Gypsum-karst problems in constructing dams in the USA  

USGS Publications Warehouse

Gypsum is a highly soluble rock and is dissolved readily to form caves, sinkholes, disappearing streams, and other karst features that typically are also present in limestones and dolomites. Gypsum karst is widespread in the USA and has caused problems at several sites where dams were built, or where dam construction was considered. Gypsum karst is present (at least locally) in most areas where gypsum crops out, or is less than 30-60 m below the land surface. These karst features can compromise on the ability of a dam to hold water in a reservoir, and can even cause collapse of a dam. Gypsum karst in the abutments or foundation of a dam can allow water to pass through, around, or under a dam, and solution channels can enlarge quickly, once water starts flowing through such a karst system. The common procedure for controlling gypsum karst beneath the dam is a deep cut-off trench, backfilled with impermeable material, or a close-spaced grout curtain that hopefully will fill all cavities. In Oklahoma, the proposed Upper Mangum Dam was abandoned before construction, because of extensive gypsum karst in the abutments and impoundment area. Catastrophic failure of the Quail Creek Dike in southwest Utah in 1989 was due to flow of water through an undetected karstified gypsum unit beneath the earth-fill embankment. The dike was rebuilt, at a cost of US $12 million, with construction of a cut-off trench 600 m long and 25 m deep. Other dams in the USA with severe gypsum-karst leakage problems in recent years are Horsetooth and Carter Lake Dams, in Colorado, and Anchor Dam, in Wyoming. ?? 2007 Springer-Verlag.

Johnson, K. S.

2008-01-01

260

Thermal effects of dams in the Willamette River basin, Oregon  

USGS Publications Warehouse

Methods were developed to assess the effects of dams on streamflow and water temperature in the Willamette River and its major tributaries. These methods were used to estimate the flows and temperatures that would occur at 14 dam sites in the absence of upstream dams, and river models were applied to simulate downstream flows and temperatures under a no-dams scenario. The dams selected for this study include 13 dams built and operated by the U.S. Army Corps of Engineers (USACE) as part of the Willamette Project, and 1 dam on the Clackamas River owned and operated by Portland General Electric (PGE). Streamflows in the absence of upstream dams for 2001-02 were estimated for USACE sites on the basis of measured releases, changes in reservoir storage, a correction for evaporative losses, and an accounting of flow effects from upstream dams. For the PGE dam, no-project streamflows were derived from a previous modeling effort that was part of a dam-relicensing process. Without-dam streamflows were characterized by higher peak flows in winter and spring and much lower flows in late summer, as compared to with-dam measured flows. Without-dam water temperatures were estimated from measured temperatures upstream of the reservoirs (the USACE sites) or derived from no-project model results (the PGE site). When using upstream data to estimate without-dam temperatures at dam sites, a typical downstream warming rate based on historical data and downstream river models was applied over the distance from the measurement point to the dam site, but only for conditions when the temperature data indicated that warming might be expected. Regressions with measured temperatures from nearby or similar sites were used to extend the without-dam temperature estimates to the entire 2001-02 time period. Without-dam temperature estimates were characterized by a more natural seasonal pattern, with a maximum in July or August, in contrast to the measured patterns at many of the tall dam sites where the annual maximum temperature typically occurred in September or October. Without-dam temperatures also tended to have more daily variation than with-dam temperatures. Examination of the without-dam temperature estimates indicated that dam sites could be grouped according to the amount of streamflow derived from high-elevation, spring-fed, and snowmelt-driven areas high in the Cascade Mountains (Cougar, Big Cliff/Detroit, River Mill, and Hills Creek Dams: Group A), as opposed to flow primarily derived from lower-elevation rainfall-driven drainages (Group B). Annual maximum temperatures for Group A ranged from 15 to 20 degree(s)C, expressed as the 7-day average of the daily maximum (7dADM), whereas annual maximum 7dADM temperatures for Group B ranged from 21 to 25 degrees C. Because summertime stream temperature is at least somewhat dependent on the upstream water source, it was important when estimating without-dam temperatures to use correlations to sites with similar upstream characteristics. For that reason, it also is important to maintain long-term, year-round temperature measurement stations at representative sites in each of the Willamette River basin's physiographic regions. Streamflow and temperature estimates downstream of the major dam sites and throughout the Willamette River were generated using existing CE-QUAL-W2 flow and temperature models. These models, originally developed for the Willamette River water-temperature Total Maximum Daily Load process, required only a few modifications to allow them to run under the greatly reduced without-dam flow conditions. Model scenarios both with and without upstream dams were run. Results showed that Willamette River streamflow without upstream dams was reduced to levels much closer to historical pre-dam conditions, with annual minimum streamflows approximately one-half or less of dam-augmented levels. Thermal effects of the dams varied according to the time of year, from cooling in mid-summer to warm

Rounds, Stewart A.

2010-01-01

261

59. Downstream view of Waddell Dam showing buttress ties, crane, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

59. Downstream view of Waddell Dam showing buttress ties, crane, housing over penstock outlet (left) and storage building (right). Photographer Mark Durben, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

262

53. Humbug Creek looking downstream from Humbug Diversion Dam. Retaining ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

53. Humbug Creek looking downstream from Humbug Diversion Dam. Retaining wall for canal is visible beginning at left center. Photographer James Eastwood, 1986. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

263

63. Upstream face of Waddell Dam as viewed from the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

63. Upstream face of Waddell Dam as viewed from the west abutment. Crane at center is used to service the penstock intake. Photographer Mark Durben. Source: Salt River Project. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

264

The Removal of the Edwards Dam: Renewed Debates  

NSDL National Science Digital Library

On July 1, 1999, the destruction of the Edwards Dam in Maine began, marking the first case of an order to remove a hydroelectric dam against the owner's wishes. Dams were constructed to provide mechanical power, and later electrical power, mainly for saw, grist, and textile mills. These mills were a substantial asset to the economy by providing jobs, but as the mills closed, the economic necessity of dams diminished. Ecologists have been identifying the environmental benefits fish and wildlife receive when rivers are restored by removing dams. The Edwards River is in the process of being restored, but the restoration of another, much larger river, the Snake River in Oregon, continues to be a source of debate. Ecologists and biologists believe restoring the Snake River will help the endangered wild salmon regain their numbers. Agricultural and industrial users of the Snake River argue that the dam still provides substantial economic benefits. The eight resources listed for this In the News topic provide current information on the Edwards dam removal, the Snake River debates, and general information on dams.

Schultz, Jennifer J.

265

86. LOCK AND DAM NUMBERS 1013, 1618, 2022. INCLUSIVEGASOLINE SERVICE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

86. LOCK AND DAM NUMBERS 10-13, 16-18, 20-22. INCLUSIVE-GASOLINE SERVICE PUMPS (ML-10-37/10/1-FS), December 1938. - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 10, Guttenberg, Clayton County, IA

266

33 CFR 117.705 - Beaver Dam Creek.  

Code of Federal Regulations, 2013 CFR

...Waters 1 2013-07-01 2013-07-01 false Beaver Dam Creek. 117.705 Section 117.705 Navigation and...Specific Requirements New Jersey § 117.705 Beaver Dam Creek. The draw of the Ocean County bridge,...

2013-07-01

267

5. General view of the Glens Falls Dam from the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. General view of the Glens Falls Dam from the vicinity of its southeast end. The log chute is in the background. Facing west-southwest. - Glens Falls Dam, 100' to 450' West of U.S. Route 9 Bridge Spanning Hudson River, Glens Falls, Warren County, NY

268

Sedimentation in bottomland hardwoods downstream of an east Texas dam  

Microsoft Academic Search

Dams and reservoirs are often efficient sediment traps, and conventional wisdom holds that fluvial sediment supplies are reduced well downstream. However, there are reasons to question the extent to which fluvial and alluvial sediment supplies are reduced more than a few kilometers downstream of dams. Sedimentation in bottomlands of Loco Bayou, east Texas, was investigated at a site less than

J. Phillips

2001-01-01

269

Effect of reservoir bottom on earthquake response of concrete dams  

Microsoft Academic Search

The absorption of hydrodynamic pressure waves at the reservoir bottom has dominant effects on the structural response of the dam when subjected to ground motion. In the present study, a model is proposed for the absorption effects of the reservoir bottom in the earthquake analysis of dams. The model utilizes the wave reflection coefficient approach and is based on the

Kianoosh Hatami

1997-01-01

270

5. DIABLO DAM: DETAIL VIEW OF RELIEF VALVES AT ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. DIABLO DAM: DETAIL VIEW OF RELIEF VALVES AT ELEVATION 1044. VALVE IN FOREGROUND IS A BUTTERFLY VALVE SIX FEET IN DIAMETER; VALVE TO THE REAR IS A JOHNSON-TYPE NEEDLE VALVE BOTH VALVES WERE MANUFACTURED BY THE PELTON WATER WHEEL COMPANY, 1989. - Skagit Power Development, Diablo Dam, On Skagit River, 6.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

271

"No. 146. Looking west along dam. East side abutment." Note ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

"No. 146. Looking west along dam. East side abutment." Note sluiceway and headgates at center rear of photograph; cofferdam at center right; and the screening and mixing plant at lower right. Rail cars are on the railroad grade in background - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

272

Attitudes of Operative Dentistry Faculty toward Rubber Dam Isolation.  

ERIC Educational Resources Information Center

Dental faculty responses (N=332) to a survey concerning use of rubber dams for excluding fluids from the working field in operative dentistry procedures indicated students receive adequate instruction in rubber dam use and are proficient at graduation, though motivating students to its use is problematic and patient resistance a factor. (MSE)

Brackett, William W.; And Others

1989-01-01

273

Correlations among the WISC-R, PIAT, and DAM.  

ERIC Educational Resources Information Center

The WISC-R, PIAT, and DAM were examined to ascertain relationships among the three instruments. Correlations indicate that information yielded by the PIAT may be obtained through WISC-R results, while the DAM may be tapping other abilities not adequately assessed by either of the other two measures. (Author)

White, Thomas H.

1979-01-01

274

View of Lake Sabrina Dam showing wooden planks along the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of Lake Sabrina Dam showing wooden planks along the upstream face and concrete base added in 1916/1917 and showing the iron grating covering upstream side of outlet structure is visible at lower photo center, view northeast - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

275

5. VIEW SHOWING HORSE MESA DAM UNDER CONSTRUCTION. THREE PENSTOCKS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW SHOWING HORSE MESA DAM UNDER CONSTRUCTION. THREE PENSTOCKS ARE AT CENTER AND CONCRETE TOWER LINES. AGGREGATE OPERATION IS VISIBLE ABOVE CONSTRUCTION SITE July 22, 1926 - Horse Mesa Dam, Salt River, 65 miles East of Phoenix, Phoenix, Maricopa County, AZ

276

GENERAL CLOSEUP AERIAL OF ELWHA DAM AND POWER HOUSE LOOKING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL CLOSE-UP AERIAL OF ELWHA DAM AND POWER- HOUSE LOOKING DOWN ON SURGE TANK, BIFURCATED PENSTOCK, SPILLWAYS, AND NORTH END OF RESERVOIR. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

277

9. 'CRIB DAM IN LAKE FORK RIVER AT HEADING OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. 'CRIB DAM IN LAKE FORK RIVER AT HEADING OF LAKE FORK CANAL, UINTAH PROJECT. TWO SLUICEWAYS TWENTY FEET WIDE HAVE BEEN LEFT IN THE DAM TO PASS BOULDERS DURING HIGH WATER. THESE SLUICEWAYS ARE CLOSED BY LOGS AND HAY DURING LOW WATER.' Date unknown - Irrigation Canals in the Uinta Basin, Duchesne, Duchesne County, UT

278

VIEW OF WARRIOR RIVER, OLIVER LOCK AND DAM LOOKING NORTHEAST, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF WARRIOR RIVER, OLIVER LOCK AND DAM LOOKING NORTHEAST, LURLEEN WALLACE BRIDGE IN BACKGROUND, GULF MOBILE & OHIO RAILROAD BRIDGE IN FRONT OF LURLEEN WALLACE BRIDGE, NORTHPORT LEFT SIDE, TUSCALOOSA RIGHT SIDE, UNIVERSITY OF ALABAMA IN RIGHT BACKGROUND. - William Baker Oliver Lock & Dam, Spans Warrior River between Tuscaloosa & Northport, Tuscaloosa, Tuscaloosa County, AL

279

6. View of lower dam masonry pier which houses the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. View of lower dam masonry pier which houses the sluice. Photograph taken from cut stone apron edging in Millstone Creek. VIEW WEST. - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

280

4. Side view of lower dam showing crest, overspill and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Side view of lower dam showing crest, overspill and apron. Photograph taken from east side of Millstone Creek. VIEW SOUTHWEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

281

11. Photographic copy of original Lower Dam for Loleta Camp ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. Photographic copy of original Lower Dam for Loleta Camp Ground drawing by Paul Wakefield, 1933 (original in possession of United States Department of Agriculture-Forest Service-Allegheny National Forest). - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

282

3. Side view of lower dam showing crest, overspill and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Side view of lower dam showing crest, overspill and apron. Photograph taken from west side of Millstone Creek. VIEW NORTHEAST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

283

2. Rear view of upper dam with Millstone Creek flowing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Rear view of upper dam with Millstone Creek flowing over overspill. Photograph taken from west bank of Millstone Creek. VIEW SOUTHEAST - Loleta Recreation Area, Upper Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

284

5. Rear view of lower dam showing crest, masonry pier ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Rear view of lower dam showing crest, masonry pier and sluice gate. Photograph taken from east bank of the sandy beach. VIEW SOUTH - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

285

9. Photographic copy of historic photograph showing lower dam without ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Photographic copy of historic photograph showing lower dam without stone apron and water flowing over the overspill. Date and photographer unknown. (original in possession of United States Department of Agriculture-Forest Service-Allegheny National Forest) VIEW WEST - Loleta Recreation Area, Lower Dam, 6 miles Southeast of interesection of State Route 24041 & State Route 66, Loleta, Elk County, PA

286

5. LOOKING WEST ALONG THE AXIS OF THE DAM TOWARD ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. LOOKING WEST ALONG THE AXIS OF THE DAM TOWARD THE OUTLET STRUCTURE. HAND OPERATED MECHANICAL TAMPERS ARE COMPACTING THE FILL ALONG THE STEEL SHEET PILING CUTOFF WALL IN THE FOREGROUND. Volume XIX, No. 6, April 12, 1940. - Prado Dam, Santa Ana River near junction of State Highways 71 & 91, Corona, Riverside County, CA

287

Richard B. Russell Dam and Lake Oxygen Injection System.  

National Technical Information Service (NTIS)

When completed, the Richard B. Russell Dam and Lake will be a multipurpose project designed to provide hydropower, some flood control, recreation, and has a potential for water supply. The dam will consist of a 195-foot high, 1,900-foot long concrete grav...

J. W. Gallagher

1984-01-01

288

2. Photocopied June 1978 'THE IRON DAM.' VIEW OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Photocopied June 1978 'THE IRON DAM.' VIEW OF THE IRON DAM, THE OUTCROPPING OF THE ORE FOUND IN 1826 BY HENDERSON. FURNISHED WATER TO SAWMILL. SOURCE: BENSON LOSSING, THE HUDSON, FROM THE WILDERNESS TO THE SEA, TROY, NEW YORK, 1866, p. 25 - Adirondack Iron & Steel Company, New Furnace, Hudson River, Tahawus, Essex County, NY

289

1. INTAKE DAM NO. 1 AT HEAD OF SYSTEM (600 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. INTAKE DAM NO. 1 AT HEAD OF SYSTEM (600 ALTITUDE). CONSTRUCTED WITH CONCRETE AND RUBBLE MASONRY IN 1948. INCLUDES INTAKE SCREEN AT LEFT AND SLUICE GATE AT RIGHT. TWO 8" CAST-IRON PIPES CARRY WATER FROM THE INTAKE TO THE OLD DAM (FORMER INTAKE) DOWN LINE. - Kalaupapa Water Supply System, Waikolu Valley to Kalaupapa Settlement, Island of Molokai, Kalaupapa, Kalawao County, HI

290

95. AVALON DAM Photographic copy of construction drawing dated ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

95. AVALON DAM - Photographic copy of construction drawing dated January 19, 1911 1912? (from Record Group 115, Box 17, Denver Branch of the National Archives, Denver) BALANCING DEVICE FOR 21 FT. DIA. CYLINDER GATE - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

291

PORTFOLIO RISK ASSESSMENT OF SA WATER'S LARGE DAMS  

Microsoft Academic Search

This paper summarises the Portfolio Risk Assessment (PRA) process that was implemented for SA Water's 17 large dams, the information obtained from the PRA, and its use by SA Water. The PRA was designed to provide a baseline assessment of the existing dams and an initial prioritisation of future investigations and possible risk reduction measures. The PRA comprised a reconnaissance-level

David S. Bowles; Andrew M. Parsons; Loren R. Anderson; Terry F. Glover

1999-01-01

292

3. CREST OF THE SOUTH CHANNEL DAM, SHOWING BLOCK HOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. CREST OF THE SOUTH CHANNEL DAM, SHOWING BLOCK HOUSE (NOT ORIGINAL) COVERING THE ELECTRICALLY POWERED GATE-LIFTING MECHANISM THAT REPLACED THE ORIGINAL HAND-OPERATED LIFTING DEVICE, LOOKING NORTH. - Washington Water Power Company Post Falls Power Plant, South Channel Dam, West of intersection of Spokane & Fourth Streets, Post Falls, Kootenai County, ID

293

Oblique overview, looking northnortheast, of south elevation of diversion dam, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Oblique overview, looking north-northeast, of south elevation of diversion dam, showing all seven rollers, four gatehouses, and four piers. Note also the paved west river bank and training wall - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

294

1. VIEW NORTHEAST OF DAM AND HEADWORKS (LEFT), FROM SDK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW NORTHEAST OF DAM AND HEADWORKS (LEFT), FROM SDK OF WEST CANADA CREEK, WITH REMAINS OF 12 FOOT PIPELINE AND HIGH-LEVEL INTAKE PIPE (EXTREME LEFT) - Trenton Falls Hydroelectric Station, Dam & Headworks, On west bank of West Canada Creek, along Trenton Falls Road, 2 miles north of New York Route 28, Trenton Falls, Oneida County, NY

295

12. Credit PED. View of tail race and dam showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. Credit PED. View of tail race and dam showing dumping of construction rubble into river bed by rail car; and preparations for pouring a concrete cap onto tail race wall. Photo c. 1909. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

296

30. VIEW SOUTHEAST ON SHELTON SIDE OF DAM DURING DEWATERING. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

30. VIEW SOUTHEAST ON SHELTON SIDE OF DAM DURING DEWATERING. CORNER OF SHELTON LOCKS AND MITRE GATES AT RIGHT. - Ousatonic Water Power Company, Dam & Canals, CT Routes 34 & 108, 1 mile North of Derby-Shelton Bridge, Derby, New Haven County, CT

297

28. VIEW NORTH TOWARD DERBY DURING DEWATERING. DAM IN CENTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. VIEW NORTH TOWARD DERBY DURING DEWATERING. DAM IN CENTER OF PICTURE WITH SHELTON GATEHOUSE ON LEFT AND DERBY GATEHOUSE ON RIGHT. - Ousatonic Water Power Company, Dam & Canals, CT Routes 34 & 108, 1 mile North of Derby-Shelton Bridge, Derby, New Haven County, CT

298

The Three Gorges Dam Affects Regional Precipitation  

NASA Technical Reports Server (NTRS)

Issues regarding building large-scale dams as a solution to power generation and flood control problems have been widely discussed by both natural and social scientists from various disciplines, as well as the policy-makers and public. Since the Chinese government officially approved the Three Gorges Dam (TGD) projects, this largest hydroelectric project in the world has drawn a lot of debates ranging from its social and economic to climatic impacts. The TGD has been partially in use since June 2003. The impact of the TGD is examined through analysis of the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM) rainfall rate and Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature and high-resolution simulation using the Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) fifth-generation Mesoscale Model (MM5). The independent satellite data sets and numerical simulation clearly indicate that the land use change associated with the TGD construction has increased the precipitation in the region between Daba and Qinling mountains and reduced the precipitation in the vicinity of the TGD after the TGD water level abruptly rose from 66 to 135 m in June 2003. This study suggests that the climatic effect of the TGD is on the regional scale (approx.100 km) rather than on the local scale (approx.10 km) as projected in previous studies.

Wu, Liguang; Zhang, Qiang; Jiang, Zhihong

2006-01-01

299

A Farmer-Friendly Dam Safety Evaluation Procedure As A Key Part of Modern Australian Water Laws  

Microsoft Academic Search

The largest dams are generally built and managed by Governments; individual owners build small dams. Over time, many dam safety aspects have changed, such as population distributions, meteorological information, engineering methods and design standards, together with the condition of the dams, raising serious doubts about dam adequacy. For the larger dams response has been to spend vast amounts on remedial

John D. Pisaniello; Jennifer M. McKay

2003-01-01

300

Geophysical Investigations at Hidden Dam, Raymond, California Flow Simulations  

USGS Publications Warehouse

Numerical flow modeling and analysis of observation-well data at Hidden Dam are carried out to supplement recent geophysical field investigations at the site (Minsley and others, 2010). This work also is complementary to earlier seepage-related studies at Hidden Dam documented by Cedergren (1980a, b). Known seepage areas on the northwest right abutment area of the downstream side of the dam was documented by Cedergren (1980a, b). Subsequent to the 1980 seepage study, a drainage blanket with a sub-drain system was installed to mitigate downstream seepage. Flow net analysis provided by Cedergren (1980a, b) suggests that the primary seepage mechanism involves flow through the dam foundation due to normal reservoir pool elevations, which results in upflow that intersects the ground surface in several areas on the downstream side of the dam. In addition to the reservoir pool elevations and downstream surface topography, flow is also controlled by the existing foundation geology as well as the presence or absence of a horizontal drain in the downstream portion of the dam. The current modeling study is aimed at quantifying how variability in dam and foundation hydrologic properties influences seepage as a function of reservoir stage. Flow modeling is implemented using the COMSOL Multiphysics software package, which solves the partially saturated flow equations in a two-dimensional (2D) cross-section of Hidden Dam that also incorporates true downstream topography. Use of the COMSOL software package provides a more quantitative approach than the flow net analysis by Cedergren (1980a, b), and allows for rapid evaluation of the influence of various parameters such as reservoir level, dam structure and geometry, and hydrogeologic properties of the dam and foundation materials. Historical observation-well data are used to help validate the flow simulations by comparing observed and predicted water levels for a range of reservoir elevations. The flow models are guided by, and discussed in the context of, the geophysical work (Minsley and others, 2010) where appropriate.

Minsley, Burke J.; Ikard, Scott

2010-01-01

301

Channel evolution on the dammed Elwha River, Washington, USA  

USGS Publications Warehouse

Like many rivers in the western U.S., the Elwha River, Washington, has changed substantially over the past century in response to natural and human forcing. The lower river is affected by two upstream dams that are slated for removal as part of a major river restoration effort. In preparation for studying the effects of dam removal, we present a comprehensive field and aerial photographic analysis of dam influence on an anabranching, gravel-bed river. Over the past century with the dams in place, loss of the upstream sediment supply has caused spatial variations in the sedimentary and geomorphic character of the lower Elwha River channel. Bed sediment is armored and better sorted than on the naturally evolving bed upstream of the dams. On time scales of flood seasons, the channel immediately below the lower dam is fairly stable, but progresses toward greater mobility downstream such that the lowermost portion of the river responded to a recent 40-year flood with bank erosion and bed-elevation changes on a scale approaching that of the natural channel above the dams. In general, channel mobility in the lowest 4 km of the Elwha River has not decreased substantially with time. Enough fine sediment remains in the floodplain that – given sufficient flood forcing – the channel position, sinuosity, and braiding index change substantially. The processes by which this river accesses new fine sediment below the dams (rapid migration into noncohesive banks and avulsion of new channels) allow it to compensate for loss of upstream sediment supply more readily than would a dammed river with cohesive banks or a more limited supply of alluvium. The planned dam removal will provide a valuable opportunity to evaluate channel response to the future restoration of natural upstream sediment supply.

Draut, A. E.; Logan, J. B.; Mastin, M. C.

2011-01-01

302

Feasibility Assessment for Hydroelectric Power Development at O'Shaughnessy Dam and Griggs Dam Near Columbus, Ohio.  

National Technical Information Service (NTIS)

The study considered the feasibility of developing hydroelectric plants at two water supply dams, O'Shaughnessy and Griggs, both located on the Scioto River. O'Shaughnessy Dam, about 16 miles north of Columbus, Ohio, is approximately 65 feet high, impound...

1979-01-01

303

Connecticut Coastal Basin, Trumbull, Connecticut. Pinewood Lake Dam CT 00080. Phase I Inspection Report. National Dam Inspection Program.  

National Technical Information Service (NTIS)

The project, built in 1870, consists of a stone masonry and earthfill embankment dam, a stone and mortar masonry spillway and an earthfill dike. The dam is approximately 450 feet long, 42 feet wide at the crest and 22 feet above the streambed of Booth Hil...

1979-01-01

304

Comparison of Failure Modes from Risk Assessment and Historical Data for Bureau of Reclamation Dams. Dam Safety Research Report.  

National Technical Information Service (NTIS)

In the summer of 1997, the Bureau of Reclamation Dam Safety Office funded a student summer sabbatical to review initial studies of Risk Analysis of various dams. Two major questions were addressed: (1) Are risk analyses producing consistent results from t...

J. Tatalovich

1997-01-01

305

Behavior and dam passage of juvenile Chinook salmon at Cougar Reservoir and Dam, Oregon, March 2011 - February 2012  

USGS Publications Warehouse

The movements and dam passage of juvenile Chinook salmon implanted with acoustic transmitters and passive integrated transponder tags were studied at Cougar Reservoir and Dam, near Springfield, Oregon. The purpose of the study was to provide information to aid with decisions about potential alternatives for improving downstream passage conditions for juvenile salmonids in this flood-control reservoir. In 2011, a total of 411 hatchery fish and 26 wild fish were tagged and released during a 3-month period in the spring, and another 356 hatchery fish and 117 wild fish were released during a 3-month period in the fall. A series of 16 autonomous hydrophones throughout the reservoir and 12 hydrophones in a collective system near the dam outlet were used to determine general movements and dam passage of the fish over the life of the acoustic transmitter, which was expected to be about 3 months. Movements within the reservoir were directional, and it was common for fish to migrate repeatedly from the head of the reservoir downstream to the dam outlet and back to the head of the reservoir. Most fish were detected near the temperature control tower at least once. The median time from release near the head of the reservoir to detection within about 100 meters of the dam outlet at the temperature control tower was between 5.7 and 10.8 days, depending on season and fish origin. Dam passage events occurred over a wider range of dates in the spring and summer than in the fall and winter, but dam passage numbers were greatest during the fall and winter. A total of 10.5 percent (43 of 411) of the hatchery fish and 15.4 percent (4 of 26) of the wild fish released in the spring are assumed to have passed the dam, whereas a total of 25.3 percent (90 of 356) of the hatchery fish and 16.9 percent (30 of 117) of the wild fish released in the fall are assumed to have passed the dam. A small number of fish passed the dam after their transmitters had stopped working and were detected at passive integrated transponder detectors at various locations downstream of the dam, indicating some tagged fish passed the dam undetected. The rate of dam passage was affected by diel period, discharge, and reservoir elevation. Diel period was the most influential factor of those examined, with nighttime dam passage rates about 9 times greater than daytime rates, depending on the distance of fish from the dam outlet. Dam passage rates also were positively related to dam discharge, and negatively related to reservoir elevation. In the operational condition used as an example, fish approached the dam outlet at the temperature control tower from the south and east and, when most fish got near the tower, they were directly in front of it. In many cases, the results for wild and hatchery fish were similar, or the results suggested hatchery fish could be reasonable surrogates for wild fish. Hatchery-origin and wild-origin fish behaved similarly in the following ways: their general movements in the reservoir; the timing of their dam passage; and the effects of diel period, discharge, and elevation on their passage rates. Parasitic copepods were present on most wild fish examined, and the mortality of wild fish during capture, handling and tagging was much greater than that of hatchery fish. This suggests that the ability of wild fish to cope with stressors may be less than that of fish directly from the hatchery.

Beeman, John W.; Hansel, Hal C.; Hansen, Amy C.; Haner, Philip V.; Sprando, Jamie M.; Smith, Collin D.; Evans, Scott D.; Hatton, Tyson W.

2013-01-01

306

Natural Dams as Tipping Points in Himalayan Erosion (Invited)  

NASA Astrophysics Data System (ADS)

Natural dams result from hillslope, glacial, volcanic, and other sediment inputs that temporarily overwhelm the transport capacity along a given river reach. Such blockages are tipping points in which fluvial erosion and sediment transport rapidly switch to aggradation and vice versa even in the most powerful of rivers, thus eventually modulating both rates and duration of river incision into bedrock. Conspicuous clusters of hundreds of large natural dams occur in several major watersheds draining the Himalayan syntaxes and the southern Himalayan front, including the Indus, Yarlung Tsangpo, Sutlej, Kali Gandaki, and Arun. The Indus features the largest concentration of giant landslide dams known worldwide, whereas the Yarlung Tsangpo seems largely devoid of comparable landslide dams. Glacial dams such as river-blocking moraines are limited to headwaters where topography intersects the regional snowline. By forming dams and protective alluvial fill, glaciers and landslides help retard headward fluvial bedrock incision into parts of the Tibetan Plateau interior, limiting its dissection in addition to effects of upstream aridity and localized rock uplift. A growing number of radiometric age constraints on widely exposed lake sediments and backwater terraces support the notion that large tracts of these rivers had been repeatedly ponded for as long as several tens of thousands of years during the Late Quaternary. High local topographic relief in buffers along these rivers characterizes conspicuous knickzones, and helps pinpoint first-order differences in the type and potential longevity of these natural dams. Patterns of low-temperature thermochronometric data corroborate that peaks in mean local relief, spatially coinciding with peaks in long-term exhumation rates, act as a regionally consistent downstream limit to the preservation potential of natural dams. If indeed glacier and landslide dams act as a negative feedback in response to fluvial dissection of parts of the Tibetan Plateau margin, then the extent of this effect may be limited to first order by maximum relief production, thus enhancing the spatial clustering of natural dams on plateau areas upstream of high topographic relief. In other words, topographic relief may be a prime morphometric predictor of where Himalayan rivers chiefly accumulate or erode sediment aided by the formation of natural dams. I conclude by outlining pending research issues including the magnitude and frequency of river-damming events as well as the erosional efficacy of potential dam-burst flows.

Korup, O.

2010-12-01

307

The River Dammed: The Proposed Removal of the Lower Snake River Dams  

NSDL National Science Digital Library

This site contains a dilemma case in which a congresswoman must cast her vote on the removal of the lower Snake River dams. Students assume the roles of stakeholders in this decision who represent government agencies, small businesses, large industries, farmers, local tribes, environmentalists, and sports fishermen. Some of the stakeholders are members of the congresswoman's family. This activity will help students understand the effect of dams on physical stream processes, demonstrate how physical alterations of streams lead to long-term effects on habitat both upstream and downstream from the alteration, illustrate how human systems become dependent on large environment-altering structures and, help students become aware of how enmeshed various government agencies are in this and other water issues. Students will also become aware that the point-of-view of each stakeholder often determines how facts are interpreted and presented to defend or oppose a proposed action.

Price, Alan

308

Minidoka Dam Wildlife Impact Assessment: Final Report.  

SciTech Connect

A wildlife impact assessment has been developed for the US Bureau of Reclamation's Minidoka Dam and Reservoir in south central Idaho. This assessment was conducted to fulfill requirements of the Fish and Wildlife Program. Specific objectives of this study included the following: select target wildlife species, and identify their current status and management goals; estimate the net effects on target wildlife species resulting from hydroelectric development and operation; recommend protection, mitigation, and enhancement goals for target wildlife species affected by hydroelectric development and operation; and consult and coordinate impact assessment activities with the Northwest Power Planning Council, Bonneville Power Administration, US Bureau of Reclamation, Bureau of Land Management, Shoshone-Bannock Tribes, US Fish and Wildlife Service, Pacific Northwest Utilities Conference Committee, and other entities expressing interest in the project. 62 refs., 2 figs., 11 tabs.

Martin, Robert C.; Meuleman, G. Allyn

1989-03-01

309

Responses of riparian reptile communities to damming and urbanization  

USGS Publications Warehouse

Various anthropogenic pressures, including habitat loss, threaten reptile populations worldwide. Riparian zones are critical habitat for many reptile species, but these habitats are also frequently modified by anthropogenic activities. Our study investigated the effects of two riparian habitat modifications-damming and urbanization-on overall and species-specific reptile occupancy patterns. We used time-constrained search techniques to compile encounter histories for 28 reptile species at 21 different sites along the Broad and Pacolet Rivers of South Carolina. Using a hierarchical Bayesian analysis, we modeled reptile occupancy responses to a site's distance upstream from dam, distance downstream from dam, and percent urban land use. The mean occupancy response by the reptile community indicated that reptile occupancy and species richness were maximized when sites were farther upstream from dams. Species-specific occupancy estimates showed a similar trend of lower occupancy immediately upstream from dams. Although the mean occupancy response of the reptile community was positively related to distance downstream from dams, the occupancy response to distance downstream varied among species. Percent urban land use had little effect on the occupancy response of the reptile community or individual species. Our results indicate that the conditions of impoundments and subsequent degradation of the riparian zones upstream from dams may not provide suitable habitat for a number of reptile species.

Hunt, Stephanie D.; Guzy, Jacquelyn C.; Price, Steven J.; Halstead, Brian J.; Eskew, Evan A.; Dorcas, Michael E.

2013-01-01

310

Initial Fluvial Response to the Removal of Oregon's Marmot Dam  

NASA Astrophysics Data System (ADS)

A temporary, 14-meter-high earthen cofferdam standing in place of Marmot Dam was breached on 19 October 2007, allowing the 80-kilometer-long Sandy River to flow freely from Mount Hood, Oreg., to the Columbia River for the first time in nearly 100 years. Marmot Dam is one of the largest dams in the western United States (in terms of height and volume of stored sediment) to have been removed in the past 40 years, and its removal exposed approximately 730,000 cubic meters of stored sand and gravel to erosion and transport by the newly energetic mountain river. At the time, its breach represented the greatest release of sediment from any U.S. dam removal. (The March 2008 breaching of Montana's Milltown Dam exposed about 5-10 times as much sediment to potential erosion.) Ongoing, intensive monitoring of erosion, transport, and deposition of that sediment is providing the first detailed data from such a voluminous dam-removal sediment release, which will provide a basis for evaluating physical and numerical modeling of the effects of future dam removals from mountain rivers.

Major, Jon J.; O'Connor, Jim E.; Grant, Gordon E.; Spicer, Kurt R.; Bragg, Heather M.; Rhode, Abagail; Tanner, Dwight Q.; Anderson, Chauncey W.; Wallick, J. Rose

2008-07-01

311

Landscape change and hydrologic alteration associated with dam construction  

NASA Astrophysics Data System (ADS)

Characterizing the landscape changes and hydrologic alterations associated with dam construction is very important for watershed management. This paper presents a case study of the Lancang River in Yunnan Province following dam construction. The landscape patterns and dynamics indicate the fragmentation, shape, and diversity of the river in 1980, 1990, and 2000. The Range of Variability Approach (RVA) is used to evaluate the degree of hydrologic alteration (DHA) using 44 years (1957-2000) of hydrologic data. The results indicate that the midstream and downstream landscapes were affected by dam construction, becoming more complex and fragmented during the 1980-2000 period; the upstream area was not influenced by dam construction and the reservoir impoundment exhibited less change. The variability in maximum runoff occurrence in the post-dam period was less than that in the pre-dam period. The integrated DHAs of the Jiuzhou (upstream), Gajiu (midstream), and Yunjinghong (downstream) stations were relatively low, reaching 26.28%, 33.40%, and 37.14%, respectively. However, the alteration became obvious in the midstream area, and the situation worsened when the river was simultaneously influenced by dam construction and other human activities (downstream). The results of the regression analysis show strong relationships of landscape metric changes with DHA, and the forestland and water areas with DHA. The DHA increased along with the aggravation of landscape fragmentation, the complexity of the landscape shape, and the diversification of the landscape.

Zhao, Qinghe; Liu, Shiliang; Deng, Li; Dong, Shikui; Cong; Wang; Yang, Zhifeng; Yang, Juejie

2012-06-01

312

Documented historical landslide dams from around the world  

USGS Publications Warehouse

This data compilation consists of dBase IV1 data files of the location, date, triggering mechanism, kind, size, failure time and mechanism, breach dimensions, subsequent controls, materials, and references for 463 historical landslide dams and associated natural reservoirs that have been recorded throughout the World. The data base presented in this report is a compilation of information on the characteristics of 463 landslide dams from around the World. It forms a basis on which to assess potential threats from existing landslide dams, or newly-formed landslide dams. The data base includes only landslide dams that have formed in historical times - that is, those formed during times when humans were able to record their occurrence, and the information transferred through various means of written and/or oral documentation. There have been far more prehistoric landslide dams about which relatively little is known. None of these is included in this data base. The focus on historical landslide dams allows insights into this natural process that will aid in understanding their role as a significant geologic process in recent Earth history.

Costa, John E.; Schuster, Robert L.

1991-01-01

313

First-year dam removal activities in the Elwha River - dam removal, sediment dispersal, and fish relocations  

NASA Astrophysics Data System (ADS)

After years of anticipation, volumes of Environmental Impact Statements, unprecedented mitigation projects, and the multifaceted collection of pre-dam removal data, the deconstruction phase of the Elwha River restoration project officially began on September 17th, 2011. With their simultaneous decommissioning, the removal of the 64 m tall Glines Canyon Dam and 33 m tall Elwha Dam represents one of the largest such projects of its kind in North America. The nearly 19 million m3 of sediment residing in the dammed reservoirs is being eroded by the river in one of the largest controlled releases of sediment into a river and marine waters in recorded history. The release of sediment and the halting of deconstruction and reservoir draw down activities during "fish windows" are largely determining a deconstruction schedule expected to last about 2 years. High suspended sediment concentrations, modeled to exceed 10,000 mg/L during the highest flows and to exceed 500 mg/L for 39% of the time in year 4 of the project (15% is the recorded background level entering the upper reservoir), could last for up to 3-5 years following dam removal depending on hydrological conditions. Anadromous fish, including three federally listed species (Puget Sound Chinook salmon, steelhead, and bull trout), reside in the river downstream of the Elwha dam for part of their life cycle. All five species of Pacific salmon and steelhead, either locally extirpated (sockeye) or persisting below the impassable Elwha Dam in degraded spawning and rearing habitat, are expected to recolonize the watershed to degrees that will vary spatially and temporally due to life history characteristics and levels of human intervention. During the first year of dam removal, adult coho salmon and steelhead were relocated from areas of high turbidity downstream of the Elwha Dam site to two tributaries upstream, where some of them successfully spawned. Additionally, steelhead were observed to naturally migrate past the Elwha Dam site and into the tributaries containing the transplanted fish. When passage above the Glines Canyon Dam is restored in 2013, salmon will have access to over 65 river kilometers of mainstem spawning and rearing habitat, at least as much floodplain channel habitat, and numerous tributaries; most of this habitat occurs in the wilderness of Olympic National Park. This presentation will provide an update of dam removal progress, highlight some pre-dam removal studies and ongoing monitoring, and detail recent fish relocation efforts.

Duda, J. J.; McMillan, J. R.; Moses, R.; McHenry, M.; Pess, G. R.; Brenkman, S.; Peters, R.; Zimmerman, M.; Warrick, J. A.; Curran, C. A.; Magirl, C. S.; Beirne, M.; Rubin, S.

2012-12-01

314

River turbidity and sediment loads during dam removal  

NASA Astrophysics Data System (ADS)

Dam decommissioning has become an important means for removing unsafe or obsolete dams and for restoring natural fluvial processes, including discharge regimes, sediment transport, and ecosystem connectivity [Doyle et al., 2003]. The largest dam-removal project in history began in September 2011 on the Elwha River of Washington State (Figure 1a). The project, which aims to restore the river ecosystem and increase imperiled salmon populations that once thrived there, provides a unique opportunity to better understand the implications of large-scale river restoration.

Warrick, Jonathan A.; Duda, Jeffrey J.; Magirl, Christopher S.; Curran, Chris A.

2012-10-01

315

River turbidity and sediment loads during dam removal  

USGS Publications Warehouse

Dam decommissioning has become an important means for removing unsafe or obsolete dams and for restoring natural fluvial processes, including discharge regimes, sediment transport, and ecosystem connectivity [Doyle et al., 2003]. The largest dam-removal project in history began in September 2011 on the Elwha River of Washington State (Figure 1a). The project, which aims to restore the river ecosystem and increase imperiled salmon populations that once thrived there, provides a unique opportunity to better understand the implications of large-scale river restoration.

Warrick, Jonathan A.; Duda, Jeffrey J.; Magirl, Christopher S.; Curran, Chris A.

2012-01-01

316

Risk Perception Analysis Related To Existing Dams In Italy  

NASA Astrophysics Data System (ADS)

In the first part of this work, the progress of Italian National Rules about dams design, construction and operation are presented to highlight the strong connection existing between the promulgation of new decrees, as a consequence of a dam accidents, and the necessity to prevent further loss of lives and goods downstream. Following the Gleno Dam failure (1923), a special Ministerial Committee wrote out the first Regulations and made the proposal to establish, within the High Council of Public Works, a special department that become soon the "Dam Service", with the tasks of control and supervision about construction and operation phases of the dams and their reservoirs. A different definition of tasks and the structure of Dam Service were provided in accordance with law n° 183/1989, which transferred all the technical services to the Office of the Prime Minister; the aim was to join the Dam Office with the Department for National Technical Services, with the objective of increasing the knowledge of the territory and promoting the study on flood propagation downstream in case of operations on bottom outlet or hypothetical dam-break. In fact, population living downstream is not ready to accept any amount of risk because has not a good knowledge of the efforts of experts involved in dam safety, both from the operators and from the safety Authority. So it's important to optimize all the activities usually performed in a dam safety program and improve the emergency planning as a response to people's primary needs and feeling about safety from Civil Protection Authority. In the second part of the work, a definition of risk is provided as the relationship existing between probability of occurrence and loss, setting out the range within to plan for prevention (risk mitigation), thanks to the qualitative assessment of the minimum safety level that is suited to assign funds to plan for Civil Protection (loss mitigation). The basic meaning of the reliability of a zoned earthfill dam is illustrated by defining the risk analysis during its construction and operation. A qualitative "Event Tree Analysis" makes clear with an example the probability of occurrence of the events triggered by an earthquake, and leads to a classification of the damage level. Finally, a System Dynamics (SD) approach is presented to investigate possibilities of a preventive planning in relationship to the risk, so that it's possible to establish shared procedures to achieve the correct management in any crisis phase. As a qualitative result of a SD application, figure 1 presents a flow-chart about a case study on the same dam so to illustrate the emergency planning in a step by step procedure according to the Regulations.

Solimene, Pellegrino

2013-04-01

317

Response of Unionid Mussels to Dam Removal in Koshkonong Creek, Wisconsin (USA)  

Microsoft Academic Search

Dam removal is a potentially powerful tool for restoring riverine habitats and communities. However, the effectiveness of this tool is unknown because published data on the effects of dam removal on in-stream biota are lacking. We investigated the effects of a small dam removal on unionid mussels in Koshkonong Creek, Wisconsin (USA). Removal of the dam led to mortality both

Suresh A. Sethi; Andrew R. Selle; Martin W. Doyle; Emily H. Stanley; Helen E. Kitchel

2004-01-01

318

TSSGNEO suggestions for refinement of safety criteria for dam at the Sayano-Shushenskaya HPP  

SciTech Connect

Analysis of radial-displacements of the dam, measured by direct and inverted plumb lines, indicates that curves of the variation in radial displacements of the dam at different elevations make it possible to plot diagrams of increases in the radial displacement over the entire height of the dam, i.e., inclines of the axis of the dam to the vertical.

Savich, A. I.; Gaziev, E. G. [Expert Commission on Assessment of the 'Dam - Bed' System at the Sayano-Shushenskaya HPP (Russian Federation)] [Expert Commission on Assessment of the 'Dam - Bed' System at the Sayano-Shushenskaya HPP (Russian Federation)

2013-09-15

319

The geological problems of the large dams constructed on the Euphrates River (Turkey)  

Microsoft Academic Search

In order to use the energy and irrigation potential of the Euphrates River, a series of dams have been designed (upstream to downstream); Keban, Karakaya, Karababa (Atatürk), Birecik and Karkamis. The first three of these dams have been completed; construction on the Birecik and Karkamis dams is underway. The initial plans involved a 60m high Gölköy dam, downstream of the

Aziz Ertunç

1999-01-01

320

Geodetic and Non-Geodetic Methods for Deformation Monitoring of Rock-Fill Dams, a Case Study at Ataturk DAM  

NASA Astrophysics Data System (ADS)

Necessity to water is increasing day by day with respect to the World population, rising of living standards and destruction of nature. Water resources have to be controlled and supplied for agricultural uses, drinking and industrial purposes by the countries having limited water resources. This situation is also considerable for Turkey which has a location in the middle zone of World and having limited water sources. Dams are among the most important engineering structures which are used for these purposes. However, the functioning life of dams is as important as the investment and construction. Nevertheless, in order to provide safety of human life living around, well planned monitoring is essential for dams. Deformation measurements have an important status among various engineering surveying. Considering the time and labor consumed by long-term measurements, processing and analysis of measured data, importance of the horizontal and vertical small structural motions at regular intervals could be comprehended. Ataturk Dam in Turkey is the 6th largest dam of world considering the filling volume of embankment. Deformation of Ataturk Dam is being monitoring yearly since 2006 by Istanbul Technical University Department of Geomatics Engineering. We apply both GPS and conventional techniques. In this study, we present the result of radial deformations on Ataturk Dam between 2006 and 2010. The results show significant horizontal movements among the 72% of object points. Maximum movement is found as 14.12 cm (with a radial component of 14.08 cm) in 4.5 years.

Kalkan, Y.; Bilgi, S.

2012-12-01

321

Numerical modelling of pore-pressure diffusion in a reservoir-induced seismicity site in northeast Brazil  

Microsoft Academic Search

SUMMARY A 3-D fluid-flow model is used to investigate pore-pressure diffusion as a mechanism for reservoir-induced seismicity (RIS) at the Acu reservoir in NE Brazil. The Acu dam is a 34-m high earth-filled dam constructed in 1983 on an area of Precambrian shield. Seismic activity in this area has been monitored over a 10-yr period (1987-1997). The frequency of earthquakes

Aderson F. do Nascimento; Rebecca J. Lunn; Patience A. Cowie

2005-01-01

322

Dams and the Environment: Considerations in World Bank Projects.  

National Technical Information Service (NTIS)

The paper reviews the environmental factors associated with large storage dam projects and the economic analysis of environmental effects. Consideration is given to environmental effects that occur upstream, on-site, and downstream and techniques of econo...

J. A. Dixon L. M. Talbot G. J. M. Le Moigne

1989-01-01

323

2. PERSPECTIVE LOOKING NORTH BY 300 DEGREES CHIEF JOSEPH DAM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. PERSPECTIVE LOOKING NORTH BY 300 DEGREES CHIEF JOSEPH DAM INTERPRETIVE CENTER IN FOREGROUND - Columbia River Bridge at Bridgeport, State Route 17 spanning Columbia River, Bridgeport, Douglas County, WA

324

2. VIEW SOUTHWEST OF TAILRACE; DAM AND WHEELHOUSE WING AT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW SOUTHWEST OF TAILRACE; DAM AND WHEELHOUSE WING AT CENTER - Willimantic Linen Company, Mill No. 2, South Main Street opposite Durham Street, North bank Willimantic River, Windham, Windham County, CT

325

GENERAL VIEW OF EAST SIDE LOOKING WEST, ROLLER DAM AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW OF EAST SIDE LOOKING WEST, ROLLER DAM AND RURAL ELECTRICAL FACILITY IN FOREGROUND AND CURRENT HIGHWAY 151 BRIDGE IN BACKGROUND. - Wapsipinicon River Bridge, Spanning Wapsipinicon River at former State Highway 151, Anamosa, Jones County, IA

326

Restoration of the Elwha River by Dam Removal, Washington  

NSDL National Science Digital Library

This online article, from "The Biodiversity Crisis: Losing What Counts", describes the efforts to restore the Elwha River's salmon population. It includes a history of the dam construction and the effect on fish populations and the recommendations for restoration.

327

VIEW OF CIPPOLETTI WEIR BELOW TUMALO DIVERSION DAM. FROM WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF CIPPOLETTI WEIR BELOW TUMALO DIVERSION DAM. FROM WEST BANK OF TUMALO CREEK. LOOKING SOUTHWEST - Tumalo Irrigation District, Tumalo Project, West of Deschutes River, Tumalo, Deschutes County, OR

328

Environmental impacts on increased hydorelectric development at existing dams.  

National Technical Information Service (NTIS)

This report has been prepared in support of the National Energy Strategy (NES) to examine the potential environmental effects of an initiative to enhance the development of hydropower at existing dams. This initiative is being considered by the US Departm...

S. F. Railsback G. F. Cada C. H. Petrich M. J. Sale J. A. Shaakir-Ali

1991-01-01

329

22. View of tramway and car used for servicing dam, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. View of tramway and car used for servicing dam, looking north. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

330

Training for Dam Operators: A Manual for Instructors.  

National Technical Information Service (NTIS)

This training manual has been prepared for use by Bureau personnel to instruct dam operators in the basics of operation and maintenance. It provides an outline of general information useful at representative facilities, and is not projected to discuss in ...

1981-01-01

331

Study on Rock Bolt Reinforcement for a Gravity Dam Foundation  

NASA Astrophysics Data System (ADS)

In this article, the rock bolt reinforcement mechanism is discussed, and the gravity method as well as the finite element method for the bolted rock is presented. These methods are applied to study the gravity dam foundation of the Xiaoxi Hydropower Project, which is influenced by the presence of a large fault with a cracked zone over 180 m wide. Rock bolt reinforcement was used to improve the stability of the dam foundation, and the reinforcement parameters were determined from a semi-empirical equation controlled by in situ test. The stability analysis was conducted using the above methods, and the improvement in terms of deformation and stress as well as stability of the dam foundation due to the reinforcement is assessed. Rock bolt reinforcement was completed successfully, and the dam started normal operations in January 2008.

Chen, S. H.; Yang, Z. M.; Wang, W. M.; Shahrour, I.

2012-01-01

332

1. View of Lake Hodges Dam showing the origin of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. View of Lake Hodges Dam showing the origin of the flume at left. View is looking east. - Lake Hodges Flume, Along San Dieguito River between Lake Hodges & San Dieguito Reservoir, Rancho Santa Fe, San Diego County, CA

333

Detection of Zone of Seepage Beneath Earthfill Dam.  

National Technical Information Service (NTIS)

Missouri University of Science and Technology (MST) propose to acquire resistivity and self-potential data at the Lake Sherwood earth fill dam site. These geophysical data will be processed, analyzed and interpreted with the objective of locating and mapp...

N. Anderson

2008-01-01

334

8. VIEW SHOWING FORM WORK OF DESILTING BASIN DAM. THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. VIEW SHOWING FORM WORK OF DESILTING BASIN DAM. THE DOWNSTREAM FACE RIGHT WAS COMPOSED OF A SERIES OF ARCHES Photographer unknown, March 13, 1939 - Cross Cut Hydro Plant, North Side of Salt River, Tempe, Maricopa County, AZ

335

JiTT - Water Issues and the Aswan High Dam  

NSDL National Science Digital Library

1) What are some of the GOOD changes for the environment and positive impacts on the local people from construction of the Aswan High Dam? 2) What are some of the BAD changes for the environment and negative ...

Guertin, Laura

336

27. LONG VALLEY DAM MIDDLE GROUND WITH TOP OF OWENS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. LONG VALLEY DAM MIDDLE GROUND WITH TOP OF OWENS RIVER GORGE BOTTOM OF PICTURE - Los Angeles Aqueduct, From Lee Vining Intake (Mammoth Lakes) to Van Norman Reservoir Complex (San Fernando Valley), Los Angeles, Los Angeles County, CA

337

3. NORTH SIDE OF DIVERSION DAM ON THE SNAKE RIVER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. NORTH SIDE OF DIVERSION DAM ON THE SNAKE RIVER SHOWING HEADGATE ON THE NORTH BANK. VIEW IS TO THE NORTH-NORTHWEST. - Snake River Ditch, Headgate on north bank of Snake River, Dillon, Summit County, CO

338

2. UPSTREAM SIDE OF DIVERSION DAM ON THE SNAKE RIVER, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. UPSTREAM SIDE OF DIVERSION DAM ON THE SNAKE RIVER, LOOKING SOUTH-SOUTHWEST. NOTE BANK REINFORCEMENT ON LEFT AND SPILLWAY ON RIGHT. - Snake River Ditch, Headgate on north bank of Snake River, Dillon, Summit County, CO

339

Multichannel Analysis of Surface Waves and Dam Safety  

NASA Astrophysics Data System (ADS)

Geophysical methodologies and particularly the Multichannel Analysis of Surface Waves (MASW) effectively proved their efficiency in the non-destructive testing of the dams, in the last decade, after many successful applications worldwide. The MASW method developed in the outset of this decade considerably improved the prospects and the validity of these geophysical applications. Since MASW and the other geophysical techniques do not require drilling they progressively increased their popularity significantly. The Multichannel Analysis of Surface Waves can be applied for the assessment of both earthen and concrete dams. Nevertheless, mostly cases of earthen dams can be found in the literature. The method can detect and map low shear wave velocity areas potentially associated with low cohesion zones due to differential settlement events in the core or increased seepage. The advantage of MASW is that it is not influenced by the water saturation of the interior of the dam contrary to other methods eg. p-wave tomography. Usually, a joint application of MASW with the p-wave techniques can be an optimal choice since the two methodologies can act complementary. An application of MASW on a three-dimensional structure, such as a dam, however, can actually be considered as a complicated problem since the effects of the lateral structural anomalies can strongly affect the results. For example, in an earthen dam the investigation of the core can be influenced by the presence of the shells. Therefore, the problem should be carefully examined by modeling all these the lateral anomalies with the aim to avoid a misinterpretation of the results. The effectiveness of MASW to the dam safety assessment is presented through two example applications, one at the Mornos Dam, an earthen dam responsible for the water supply of Athens, and a second one at the Marathon Dam which is a concrete dam also used for the water supply of Athens. In the case of Mornos Dam, MASW detected areas affected by the differential settlement of the dam and more specifically by the arching phenomenon in the core. Such phenomena can lead to hydraulic fracture in the core and therefore should be carefully encountered. In particular the method detected, in the central part of the core, a weak zone just below the crest and another one at depth of 45 below crest, at a place where the monitoring instruments of the dam had measured very low effective stresses. This zone follows the shape pattern of the riverbed and at the edges of the crest it is connected with two other thick tensile zones. The example from the application in the concrete dam at Marathon is focused on the interior of the dam. The data acquired there, in the tunnels, were of different character than the ones gathered on usual applications on soil environment mainly due to the high and broad frequency content and the high phase velocity values. The standard data acquisition procedure also required some modification for the triggering and recording. The analysis of the data showed that such an application could provide useful results for the testing of the concrete quality.

Karastathis, V. K.

2012-12-01

340

9. WEST DAM, LOOKING EAST; NOTE FOREBAY AND PUMP HOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. WEST DAM, LOOKING EAST; NOTE FOREBAY AND PUMP HOUSE UNDER CONSTRUCTION AT LOWER LEFT, NEW WATER SUPPLY CANAL CUTTING ACROSS LOWER THIRD OF PICTURE SPACE. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

341

7. WEST DAM STRUCTURE, LOOKING NORTHWEST. QUARRIES AT BOTTOM; OUTLET ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. WEST DAM STRUCTURE, LOOKING NORTHWEST. QUARRIES AT BOTTOM; OUTLET STRUCTURE UNDER CONSTRUCTION CUTTING INTO HILL AT TOP OF PICTURE. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

342

47. COFFER DAM BEHIND POWER HOUSE SITE AT COMPLETION VIEW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

47. COFFER DAM BEHIND POWER HOUSE SITE AT COMPLETION VIEW LOOKING NORTHWEST, OCTOBER 14, 1899. THE POWER HOUSE FOUNDATION WAS TO BE PLACED JUST TO THIS SIDE OF THE COFFER DAM AFTER THE AREA HAD BEEN PUMPED DRY AND EXCAVATED. THE ST. MARY'S RIVER AND SAULT STE. MARIE, ONTARIO, ARE IN THE BACKGROUND. (35) Photocopied August 1978. - Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie, Chippewa County, MI

343

2. GORGE HIGH DAM. UNUSUALLY HIGH WATER IN GORGE LAKE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. GORGE HIGH DAM. UNUSUALLY HIGH WATER IN GORGE LAKE DUE TO THE COMBINATION OF UNIT 24 BEING DOWN FOR REWINDING AND TWO UNITS COMING ON LINE UNEXPECTEDLY AT ROSS POWERHOUSE LED TO WATER FLOWING OVER THE SPILLGATES. EACH GATE IF 47 FEET WIDE AND 50 FEET HIGH, 1989. - Skagit Power Development, Gorge High Dam, On Skagit River, 2.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

344

DISCHARGE AND DEPTH BEHIND A PARTIALLY BREACHED DAM.  

USGS Publications Warehouse

The role that the velocity-distribution correction factor plays in the determination of the flood discharge and corresponding flow depth behind a partially breached dam is investigated. Assumption of a uniformly progressive flow for an established dam-break flood in a rectangular channel of infinite extent leads to the formulation of a theoretical relation between the depth and velocity of flow expressed in differential form. Integrating this ordinary differential equation, one can express the velocity in terms of the depth.

Chen, Cheng-lung

1987-01-01

345

4. View north of Lake Whitney Dam. Wood shed at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. View north of Lake Whitney Dam. Wood shed at center of photograph houses a turbine installed in 1932. Brick structure to the left of the turbine shed is a gate house which houses the main valves controlling flow of lake to water to the filter plant. - Lake Whitney Water Filtration Plant, Lake Whitney Dam, East side of Whitney Avenue near intersection with Armory Street, Hamden, New Haven County, CT

346

Engineering geological appraisal of the Sulakyurt dam site, Turkey  

Microsoft Academic Search

This paper discusses the engineering geological investigations, diversion tunnel support design and slope stability assessment\\u000a studies carried out at the Sulakyurt dam site, northeast of Ankara, Turkey. The Sulakyurt dam will be used for flood flow\\u000a control and water storage for irrigation. Engineering geological mapping, discontinuity surveys, core drilling, water absorption\\u000a and laboratory tests were undertaken. The RMR, Q and

Ayd?n Özsan; Adem Öcal; Mutluhan Ak?n; Hakan Ba?ar?r

2007-01-01

347

Water quality assessment at Ömerli Dam using remote sensing techniques  

Microsoft Academic Search

Water quality at Ömerli Dam, which is a vital potable water resource of Istanbul City, Turkey was assessed using the first\\u000a four bands of Landsat 7-ETM satellite data, acquired in May 2001 and water quality parameters, such as chlorophyll-a, suspended\\u000a solid matter, secchi disk and total phosphate measured at several measurement stations at Ömerli Dam during satellite image\\u000a acquisition time

Erhan Alparslan; Cihangir Aydöner; Vildan Tufekci; Hüseyin Tüfekci

2007-01-01

348

National Dam Inspection Program. Fawn Lake Dam,(ID Number PA00693). Schuylkill River Basin, Plum Creek, Schuylkill County, Pennsylvania. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Fawn Lake Dam is owned by the Lake Wynonah Property Owners Association and is located in South Mannheim Township in Schuylkill County, Pennsylvania. The dam was designed by the original owner, American Realty Service Corporation of Memphis, Tennessee. The...

1978-01-01

349

National Dam Safety Program. Potomac Creek Number 2 Dam (Inventory Number VA 17913), Potomac River Basin, Stafford County, Virginia, Phase I Inspection Report.  

National Technical Information Service (NTIS)

Contents: Preface; Brief Assessment of Dam; Overview Photos; Section 1: Project Information, Section 2: Engineering Data, Section 3: Visual Inspection, Section 4: Operational Procedures, Section 5: Hydraulic/Hydrologic Data, Section 6: Dam Stability, Sect...

R. E. Martin

1980-01-01

350

Do Glacier Dams Retard River Incision Into Southeast Tibet?  

NASA Astrophysics Data System (ADS)

The southeastern fringe of the Tibetan plateau around the Namche Barwa syntaxis is characterized by rapid uplift and fluvial incision, having created spectacular relief along the Yarlung Tsangpo river gorge. This region hosts numerous monsoonal temperate glaciers, some of which have been historically dynamic, and many of which have advanced from steep tributaries to repeatedly block or divert trunk rivers during the Quaternary. We propose that repeated glacial damming has resulted in knickpoint formation, as well as valley-floor aggradation and increases in active channel widths that serve to retard fluvial bedrock incision into the flanks of the Tibetan Plateau. The coupled reduction of fluvial incision upstream of glacier dams and enhanced incision downstream of the lowermost dams would act to maintain an edge to the Tibetan Plateau by defeating propagation of knickpoints into the Plateau in a region of high uplift and precipitation. The positions of several large moraine dams in an area where local relief and erosion are highest require depressions of the regional equilibrium line altitude (ELA) of ~ 450 m, which is within the range of ELA depression for Holocene glacial advances. Such an ELA depression would on average impound ~ 40% of the river network of major rivers upstream of glacier dams; estimated, though debated, Last Glacial Maximum ELA depression of 1000 m would result in damming of about 75% of these river networks. Whether driven by increased monsoon precipitation, temperature fluctuations, or changes to supraglacial sediment flux, Quaternary glacier advances indirectly contribute to effectively retarding river incision into southeast Tibet.

Korup, O.; Montgomery, D. R.

2007-12-01

351

Feasibility of groundwater recharge dam projects in arid environments  

NASA Astrophysics Data System (ADS)

A new method for determining feasibility and prioritizing investments for agricultural and domestic recharge dams in arid regions is developed and presented. The method is based on identifying the factors affecting the decision making process and evaluating these factors, followed by determining the indices in a GIS-aided environment. Evaluated parameters include results from field surveys and site visits, land cover and soils data, precipitation data, runoff data and modeling, number of beneficiaries, domestic irrigation demand, reservoir objectives, demography, reservoirs yield and reliability, dam structures, construction costs, and operation and maintenance costs. Results of a case study on more than eighty proposed dams indicate that assessment of reliability, annualized cost/demand satisfied and yield is crucial prior to investment decision making in arid areas. Irrigation demand is the major influencing parameter on yield and reliability of recharge dams, even when only 3 months of the demand were included. Reliability of the proposed reservoirs as related to their standardized size and net inflow was found to increase with increasing yield. High priority dams were less than 4% of the total, and less priority dams amounted to 23%, with the remaining found to be not feasible. The results of this methodology and its application has proved effective in guiding stakeholders for defining most favorable sites for preliminary and detailed design studies and commissioning.

Jaafar, H. H.

2014-05-01

352

Elwha River dam removal-Rebirth of a river  

USGS Publications Warehouse

After years of planning for the largest project of its kind, the Department of the Interior will begin removal of two dams on the Elwha River, Washington, in September 2011. For nearly 100 years, the Elwha and Glines Canyon Dams have disrupted natural processes, trapping sediment in the reservoirs and blocking fish migrations, which changed the ecology of the river downstream of the dams. All five Pacific salmon species and steelhead-historically present in large numbers-are locally extirpated or persist in critically low numbers. Upstream of the dams, more than 145 kilometers of pristine habitat, protected inside Olympic National Park, awaits the return of salmon populations. As the dams are removed during a 2-3 year project, some of the 19 million cubic meters of entrapped sediment will be carried downstream by the river in the largest controlled release of sediment into a river and marine waters in history. Understanding the changes to the river and coastal habitats, the fate of sediments, and the salmon recolonization of the Elwha River wilderness will provide useful information for society as future dam removals are considered.

Duda, Jeffrey J.; Warrick, Jonathan A.; Magirl, Christopher S.

2011-01-01

353

Powder avalanche and catching dam interaction : influence of upstream dam slope ?  

NASA Astrophysics Data System (ADS)

The influence of an obstacle on the dynamics of a finite-volume density current modelling a powder-snow avalanche was investigated. A constant volume of a dyed salt solution reproduced the small-scale aerosol flowing down an inclined channel immersed in a water tank. Reference tests in the absence of the obstacle characterized the dynamics parameters of the flow and then the influence of two different types of obstacles on these parameters was studied. Both of the obstacles represent a catching dam one with a vertical uphill face (OBS1) and the second one with an inclined uphill face 32° (OBS2). A high resolution acoustic velocimeter allows measurements on the 3D Flow velocity. For the reference avalanche, it was shown that the maximum velocity norm can be up to 18% greater than the maximum horizontal contribution (parallel to the slope) and that the ratio maximum velocity norm over front velocity varies between 1.75 and 2.2. THis ratio varies between 1.7 and 2.8 for the obstacles situation. In terms of protection effectiveness, laboratory tests showed that a catching dam with the upstream vertical to the slope is more efficient than a dam with an inclined upstream face. In presence of OBS2 the flow does not hit the obstacle but it rather passes smoothly over it, without any visible detachment from the surface. The ramp effect is remarkable and the avalanche reaches faster (in terms of time) a given point downstream from the obstacle. On the contrary, in the OBS1 configuration, the incoming flow hits the vertical wall and bursts. The flow is subjected to a strong deflection with the formation of a vertical jet.

Caccamo, Paolo; Naaim-Bouvet, Florence; Faug, Thierry

2013-04-01

354

Pre-Dam-Removal Assessment of Sediment Transport for Four Dams on the Kalamazoo River between Plainwell and Allegan, Michigan.  

National Technical Information Service (NTIS)

Four dams on the Kalamazoo River between the cities of Plainwell and Allegan, Mich., are in varying states of disrepair. The Michigan Department of Environmental Quality (MDEQ) and U.S. Environmental Protection Agency (USEPA) are considering removing thes...

A. U. Syed, J. P. Bennett, C. M. Rachol

2005-01-01

355

Movement patterns of armado, Pterodoras granulosus, in the Parana?? River Basin  

USGS Publications Warehouse

We studied the migratory behaviour of armado, Pterodoras granulosus, in the Parana?? River Basin of Brazil, Paraguay and Argentina, during 1997-2005. This species invaded the Upper Parana?? River after upstream dispersal was facilitated when Itaipu Reservoir inundated a natural barrier. Fish were tagged (N = 8051) in the mainstems of the Yacyreta and Itaipu reservoirs, bays of major tributaries, the Parana?? River floodplain above Itaipu Reservoir, and below dams. In all, 420 fish were recaptured of which 61% moved away from the release area. Fish moved a maximum of 215 km (mean 42), and at a maximum rate of 9.4 km??day-1 (mean 0.6). Of the 256 armados that moved away from the release site, 145 moved upstream towards unimpounded stretches of the Parana?? River and 111 moved downstream into the reservoir and bays of its tributaries (maximum 150 km). Based on the observed migratory movements, we suspect that most of the reproductive output originates in tributaries to the reservoirs. The ability of this species to expand its range presents a conundrum by pitting fishery management interests against conservation needs. Maintenance of the important armado fisheries depends on the ability of the species to migrate freely to use spawning and nursery areas in reservoir tributaries and floodplains. However, its ability to migrate long distances can allow this non-native species the opportunity to invade most of the Upper Parana?? River. ?? Journal compilation 2007 Blackwell Munksgaard No claim to original US government works.

Makrakis, M. C.; Miranda, L. E.; Makrakis, S.; Fernandez, D. R.; Garcia, J. O.; Dias, J. H. P.

2007-01-01

356

National Dam Inspection Program. Black Creek Intake Dam (NDI Number PA-00695, DER Number 54-078), Susquehanna River Basin, Schuylkill County, Pennsylvania. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The purpose of this inspection is to determine if the dam constitutes a hazard to human life and property. The dam's location is Tremont Township, Schuylkill County U.S.G.S. Quadrangle - Pine Grove, Pa. The general appearance of the Black Creek Intake Dam...

H. Jongsma

1981-01-01

357

Bureau of Indian Affairs Safety of Dams Program. 1996 Intermediate SEED Examination Report for La Jara Dam, Jicarilla Apache Indian Reservation, New Mexico.  

National Technical Information Service (NTIS)

La Jara Dam is located on the Jucarilla Apache Indian reservation in north-central New Mexico about 20 miles south of the town of Dulce, New Mexico. The dam is operated by the Jicarilla Indian Tribe and is under the jurisdiction of the BIA. The dam was or...

W. Y. Young

1997-01-01

358

National Program for Inspection of Non-Federal Dams. Cheshire Reservoir Dam MA 00211, Hudson River Basin, Cheshire, Massachusetts. Phase 1, Inspection Report.  

National Technical Information Service (NTIS)

Cheshire Reservoir Dam is a stone masonry and concrete gravity dam about 50.5 feet long, and about 14 feet high with a dropped center spillway 40.5 feet long and a freeboard of 2.7 feet. Based on the Corps of Engineers guidelines, the dam seems to be in f...

1978-01-01

359

National Program for Inspection of Non-Federal Dams. Lake Dawson Dam (CT 00319), Connecticut Coastal Basin, Woodbridge, Connecticut. Phase I Inspection Report.  

National Technical Information Service (NTIS)

This earth embankment dam is approximately 960 feet long and rises approximately 48 feet above the downstream bed of the West River. A concrete corewall apparently runs the length of the dam. The concrete spillway at the left end of the dam is a 110 foot ...

1979-01-01

360

National Dam Inspection Program. Lake Wynonah Dam (PA00702), Schuylkill River Basin, Plum Creek, Schuylkill County, Pennsylvania. Phase 1 Inspection Report.  

National Technical Information Service (NTIS)

Lake Wynonah Dam is a 92 foot high, zoned embankment. The dam measures 950 feet along the crest impounding a 175 acre reservoir. The dam was designed to use locally available borrow materials and contains two primary material zones. The upstream zone, con...

1978-01-01

361

National Dam Safety Program. Cold Sulphur Springs Dam (Inventory Number VA 16307), James River Basin, Rockbridge County, Virginia. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The Dam is an earthfill structure approximately 250 feet long and 26.1 feet high. The dam is classified as a small size dam with a significant hazard classification. The principal spillway is a concrete open channel located at the right abutment. The emer...

B. O. Taran

1981-01-01

362

National Dam Safety Program. Unity Lake Number 2 Dam (MO 20134), Missouri - Kansas City Basin, Jackson County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

This report was prepared under the National Program of Inspection of Non-Federal Dams. This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to...

D. P. Gupta B. A. Ainsworth H. L. Callahan

1978-01-01

363

National Program for Inspection of Non-Federal Dams. West Lake Dam (MA 00288), Connecticut River Basin, Sandisfield, Massachusetts. Phase 1 Inspection Report.  

National Technical Information Service (NTIS)

The dam is an earthfill embankment about 920 feet in length, and 25 feet in height and has a reinforced concrete principle spillway, The dam has been rated fair. It has a classification of intermediate size and high hazard. Failure of the dam would pose a...

1979-01-01

364

National Dam Safety Program. Bells Lake Dam (NJ-00405). Delaware River Basin, South Branch Timber Creek, Gloucester County, New Jersey. Phase 1 Inspection Report.  

National Technical Information Service (NTIS)

This report cites results of a technical investigation as to the dam's adequacy. The inspection and evaluation of the dam is as prescribed by the National Dam Inspection Act, Public Law 92-367. The technical investigation includes visual inspection, revie...

F. K. Jolls

1979-01-01

365

Geophysical evaluation of the Success Dam foundation, Porterville, California  

USGS Publications Warehouse

Success Dam is a zonedearth fill embankment located near Porterville, CA. Studies of Success Dam by the recent Dam Safety Assurance Program (DSAP) have demonstrated the potential for seismic instability and large deformation of the dam due to relatively low levels of earthquake shaking. The U.S. Army Corps of Engineers conducted several phases of investigations to determine the properties of the dam and its underlying foundation. Detailed engineering studies have been applied using a large number of analytical techniques to estimate the response of the dam and foundation system when subjected to earthquake loading. Although a large amount of data have been acquired, most are 'point' data from borings and results have to be extrapolated between the borings. Geophysical techniques were applied to image the subsurface to provide a better understanding of the spatial distribution of key units that potentially impact the stability. Geophysical investigations employing seismic refraction tomography, direct current (DC) resistivity, audio magnetotellurics (AMT) and self-potential (SP) were conducted across the location of the foundation of a new dam proposed to replace the existing one. Depth to bedrock and the occurrence of beds potentially susceptible to liquefaction were the focus of the investigations. Seismic refraction tomography offers a deep investigation of the foundation region and looks at compressional and shear properties of the material. Whereas resistivity surveys determines conductivity relationships in the shallow subsurface and can produce a relatively high-resolution image of geological units with different electrical properties. AMT was applied because it has the potential to look considerably deeper than the other methods, is useful for confirming depth to bedrock, and can be useful in identifying deep seated faults. SP is a passive electrical method that measures the electrical streaming potential in the subsurface that responds to the movement of ground water. SP surveys were conducted at low pool and high pool conditions in order to look for evidence of seepage below the existing dam. In this paper, we summarize these techniques, present their results at Success Dam, and discuss general application of these techniques for investigating dams and their foundations.

Hunter, L. E.; Powers, M. H.; Haines, S.; Asch, T.; Burton, B. L.; Serafini, D. C.

2006-01-01

366

Proceedings of Dam-Break Flood Routing Model Workshop Held in Bethesda, Maryland on October 18-20, 1977.  

National Technical Information Service (NTIS)

Contents: The dam-break wave and the bore collapse on a beach; Unsteady flow analysis of dam-break waves; Flood plain inundation caused by dam failure; Simplified routing through reservoir; Floods from breaching of dams; Unsteady flow modeling of dam-brea...

1977-01-01

367

Engineering geology of dam sites in parts of the Niger River Basin  

NASA Astrophysics Data System (ADS)

The Niger River Basin in Nigeria holds a national record for the largest dams builts, or being built to date. The dams have been designed for power supply, irrigation, flood control and water supply purposes. A study of the engineering geology of the dam sites should provide an insight into the geological requirements for dam building in the basin and elsewhere. A comprehensive analysis of results of geophysical and engineering geological studies on dam sites in the basin have been carried out. A further engineering geological investigation of dams proposed and those under construction has also been made. The important characteristics of the dam sites have been correlated. The investigations reveal the existence of close similarities between the engineering geology of several dam sites in the basin. The results of the investigations will serve as a useful basis for the planning and development of future dams in the basin and other parts of Africa.

Malomo, S.; Olawole, J. F.

368

The geomorphic legacy of dams - an Austrian case study  

NASA Astrophysics Data System (ADS)

Dams and their removal significantly alter the water and sediment dynamics of rivers thereby inducing a range of geomorphic channel responses that often require the installation of bed and bank protection structures. Although such measures are well-established in traditional river engineering, very little is known about the long-term effects on river sediment dynamics and channel morphology. A case study is presented in which we investigated the impact of dams, dam removals and dam-related channel protection structures on sediment connectivity and channel morphology in two heavily engineered river systems in northeast Austria. To assess sediment connectivity along the river channels, facies mapping of river bed sediments was applied. Channel morphology was investigated by analysing longitudinal and cross-sectional channel profiles which were created in a GIS-environment based on ALS DEM-data. Sediment facies was directly linked to channel slope and indirectly to stream power and sediment connectivity of the rivers. Dams have shown to induce fining of sediment upstream with coarsening downstream due largely to changes in channel slope. Dam-induced erosion and sedimentation processes altered channel slope/depth (longitudinal profile) and channel width/depth (cross-sectional profile). However, the expected recovery or reverse change in sediment facies and channel morphology when the dams are removed was severely hampered by the installation of river bed and bank protection structures preventing channel slope recovery. These results highlight the need to practice river restoration in a more holistic way by further considering system-specific landscape and engineering history.

Pöppl, Ronald E.; Keesstra, Saskia D.

2014-05-01

369

Arc structure of the DAM Jupiter Emission  

SciTech Connect

An analysis of the dynamic spectra of the Jovian DAM emission (1.3--40 MHz) has been made from Voyager data; it appears that the different Jovian 'sources' can be defined by spectral chaaracteristics, rather than by occurrence probability. The non-Io emission consists of two families: vertex early arcs (VEA) and vertex late arcs (VLA). These two families are superimposed at all longitudes, but one is always more intense than the other. The characterics of the two families are specified; in particular, it is shown that the VEA family is more stable in time than the VLA family. The Io-controlled emission consists of the four sources already known from the ground-based observations in addition to a new source (Io-A')sp, identified by its dynamic spectrum alone. All of the sources are partially superimposed on non-Io emission. The (Io-B)sp and (Io-A')sp sources are made up of low-curvature arcs having low-frequency limits above 5 MHz. The high-frequency limit of the (Io-B)sp source is strongly modulated by Io-phase. The (Io-A)sp source has a specturm similar to the non-Io VLA emission. The other two sources, (Io-C)sp and (Io-D)sp, are not structured into well-defined arcs. A comparsion is made between the occurrence of these sources in the Io-CML plane with the sources defined from ground observations by probability of occurrence. Local time effects are observed only in the non-Io emission when compared before and after encounter. Before encounter, the VEA family is very weak and the VLA family very intense. After encounter, the opposite effect is observed. The Io-controlled sources are not affected by these local time effects.

Leblanc, Y.

1981-09-30

370

Route-Specific Passage Proportions and Survival Rates for Fish Passing through John Day Dam, The Dalles Dam, and Bonneville Dam in 2010 and 2011  

Microsoft Academic Search

This report fulfills a request of the U.S. Army Engineer District, Portland, Oregon, to produce an interim report of estimates of route-specific fish passage proportions and survival rates for lower Columbia River dams in 2010 and 2011. The estimates are needed to update the Compass Model for the Columbia River Treaty and the new Biological Opinion before detail technical reports

Gene R. Ploskey; Mark A. Weiland; Thomas J. Carlson

2012-01-01

371

Beaver Dam Effects on Gravel Transport Patterns - a Case Study  

NASA Astrophysics Data System (ADS)

Beaver dams are numerous in mountain streams, but little is known about gravel transport in those streams. The dams may be fully functioning and retain all incoming sediment or partially permeable to sediment or be almost completely removed. Beaver dams in their various states of preservation can have a profound influence on stream morphology and bedload transport. During the spring of 2011, the authors made a time series study of bedload transport in a mountain stream dominated by beavers dams. Dams occurred with a frequency of one every 50 feet and showed a range of decay and fluvial influence. Gravel transport was sampled with bedload traps over a 2-month long snowmelt highflow season. The reach-average gradient was 0.03 and stream widths ranged from 3 to 8 m. The stream bed was incised 0.5 to 1.5 m deep into a floodplain and typically trapezoidal in its cross-sectional shape. Much of the floodplain consisted of filled-in beaver dams. Partially breached dams that were permeable to gravel transport acted as an obstacle, forcing the flow around sharp bends. Complex hydraulic conditions developed in the vicinity of the bends with backwater eddies upstream and downstream of the remnant dam. Wake eddies at the downstream side of dam remnants caused gravel deposits. The tortuous channel course around the bends caused strong secondary currents that forced gravel transport into a narrow pathway along one of the banks causing a strong lateral concentration of transport. The pathway had a bed of fine and medium gravel, while the remainder of the bed consisted mostly of coarse gravel and cobbles that became immobile shortly after peak flows. Tracer experiments indicated that most of the mobile gravel traveled along that bankward path, even though flow velocities and depths were considerably smaller than in the stream center. Over the highflow season, flows increased to about 160% of the 1.5 year recurrence interval (Q1.5) within about a week and then remained within the range of 120-150% Q1.55 for several weeks. During this time, gravel transport rates declined by three orders of magnitude, causing a pronounced hysteresis over the spring runoff season. The reason for the large hysteresis is attributed to the retention of gravel behind a mainly intact and impermeable beaver dam 700 ft above the study transect and subsequent limitation of bedload supply. Implications - gravel transport that is dominated by secondary flows around remnants of breached dams as well as by supply limitation below unbreached dams exhibits laterally concentrated gravel pathways and strong hysteresis effects, both of which make transport poorly predictable by conventional transport equations. Similarly, field measurements are problematic. Absent a season-long time series and full cross sectional measurements, results from occasional sampling within the highflow season probably cannot describe the relationship between flow and gravel transport rates. Given the large number of beaver-dominated streams, more studies on gravel transport and how it is affected by beaver dams would be useful.

Bunte, K.; Swingle, K. W.; Potyondy, J. P.; Abt, S. R.

2011-12-01

372

Riparian vegetation affected by bank erosion in the Lower São Francisco River, Northeastern Brazil  

Microsoft Academic Search

Changes in the hydrological regime of the Lower São Francisco River, located in Northeastern Brazil have brought negative environmental impacts, jeopardizing the flora and fauna of a global biodiversity hotspot, due to implementation of hydroelectric power dams and surface water withdrawal for irrigation in public and private perimeters. Remnants of the riparian stratum associated to the riverbank destabilization in six

Francisco Sandro Rodrigues Holanda; Laura Galvão da Cunha Santos; Cícero Marques dos Santos; Ana Patrícia Barreto Casado; Alceu Pedrotti; Genésio Tâmara Ribeiro

2005-01-01

373

Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil  

Microsoft Academic Search

On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3)

Mark D. Bowen; Simone Marques; Luiz G. M. Silva; Volney Vono; Hugo P. Godinho

2006-01-01

374

Analytical solutions for gradual dam breaching and downstream river flooding  

NASA Astrophysics Data System (ADS)

An analytical model is proposed to describe lake drainage and downstream flooding due to the gradual breaching of natural and manmade earthen dams. Erodible triangular dams are considered, undergoing gradual incision by a breaching channel of constant effective width. Adopting a simple stream power law for dam material transport, the long profile evolution of the breaching channel is governed by a diffusion equation with variable diffusion rate, proportional to the water discharge. The resulting flood is routed downstream using the kinematic wave equation. Moving boundary problems are obtained due to retrogression of the breach crest, and to the downstream propagation of the flood wavefront. For both the dam breaching and flood routing problems, explicit analytical solutions are derived. They depict a breaching process that is at first self-accelerating, then becomes self-limiting. Results include boundary paths, long profiles, and stage and discharge hydrographs. In particular, the breaching solution yields a discharge hydrograph of simple analytical shape that turns out to be ideally suited for kinematic wave routing. The model is applied to the well-documented breaching of the Tangjiashan landslide dam, Sichuan, in June 2008. Calculated results for this and other cases are in reasonably good agreement with the measured data. As the model is simple to apply, with minimal computational and data requirements, it could prove useful as a tool for rapid risk assessment. The proposed analytical approach also complements numerical models by providing more transparent links between solution outcomes and the problem data.

Capart, Hervé

2013-04-01

375

76 FR 47237 - Notice of Public Meeting for the Glen Canyon Dam Adaptive Management Work Group Federal Advisory...  

Federal Register 2010, 2011, 2012, 2013

...Notice of Public Meeting for the Glen Canyon Dam Adaptive Management Work Group Federal Advisory...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2011-08-04

376

Changes in the flood regime of São Francisco River (Brazil) from 1940 to 2006  

Microsoft Academic Search

Flow regulation causes various environmental impacts in the downstream reaches of impounded rivers. The São Francisco River\\u000a (SF) basin is Brazil’s third most important watershed. Several dams have been built in its course in the last four decades,\\u000a mostly for flow regulation and hydropower generation. This paper presents an evaluation of historical changes in the flood\\u000a regime. Three regions of

Hersília de Andrade e Santos; Paulo dos Santos Pompeu; Danilo Okuma Lessa Kenji

377

Zooplankton biomass abundance and allometric patterns along an eutrophic gradient at Furnas Reservoir (Minas Gerais Brazil)  

Microsoft Academic Search

ABSTRACT: Zooplankton biomass, abundance and allometric patterns along an eutrophic gradient at Furnas reservoir (Minas Gerais, Brazil). The aim of this study was to describe the zooplankton composition, allometry, abundance and biomass along a trophic gradient at Furnas Reservoir.,Furnas,dam,is located,few,kilometres,downstream,the,mouth,of Sapucaí,River (Minas Gerais, Brazil), being one of the biggest reservoir in Brazilian Southwest (1440 Km, ). Zooplankton,was,sampled,by vertical,hauls,in three,different,campaigns along

378

Diphyllobothriasis, Brazil  

PubMed Central

Cases of human diphyllobothriasis have been reported worldwide. Only 1 case in Brazil was diagnosed by our institution from January 1998 to December 2003. By comparison, 18 cases were diagnosed from March 2004 to January 2005. All patients who became infected ate raw fish in sushi or sashimi.

Piana de Andrade, Victor; Lucas, Maria da Conceicao; Fung, Liang; Gagliardi, Sandra Maria B.; Santos, Sandra Rosalem P.; Mendes, Caio Marcio Figueiredo; Eduardo, Maria Bernadete de Paula; Dick, Terry

2005-01-01

379

A two-dimensional dam-break flood plain model  

USGS Publications Warehouse

A simple two-dimensional dam-break model is developed for flood plain study purposes. Both a finite difference grid and an irregular triangle element integrated finite difference formulation are presented. The governing flow equations are approximately solved as a diffusion model coupled to the equation of continuity. Application of the model to a hypothetical dam-break study indicates that the approach can be used to predict a two-dimensional dam-break flood plain over a broad, flat plain more accurately than a one-dimensional model, especially when the flow can break-out of the main channel and then return to the channel at other downstream reaches. ?? 1985.

Hromadka, II, T. V.; Berenbrock, C. E.; Freckleton, J. R.; Guymon, G. L.

1985-01-01

380

Simulation of Soil Moisture Development in Flood Protecting Earth Dams  

NASA Astrophysics Data System (ADS)

Extreme floods represent an increased risk for urban areas and agriculture. Time to time the protective earth dams are destroyed by a suddenly increased amount of water with destroing or even cathastrophic consequences. A numerical study of the soil moisture development within the earth body during the flood is simulated under a selection of boundary conditions. Several soil materials are considered. Simulations are performed firstly for homogeneous materials using the 2D single domain approach, in the second step the dual permeability simulations are done assuming inhomogeneities in the construction which may lead to the preferential flow. Results for saturated as well as for unsaturated part of the dam are analyzed. Using the appropriate simulation model may help to design safer flood dams and evaluate the reason of possible failures to prevent future disasters. The research has been performed in the frame of research project VZ 04 CEZ MSM 6840770005.

Cislerova, M.; Zumr, D.; Dusek, J.; Vogel, T.

2007-12-01

381

Self-potential investigation of moraine dam seepage  

NASA Astrophysics Data System (ADS)

Self-potential (SP) and electrical resistivity measurements are used to investigate seepage at a remote moraine dam in the Sierra Nevada of California. The site is a small terminal moraine impounding roughly 300,000 m 3 of water at ~ 3400 m a.s.l. Suspicious fine sediment in a small lake at the dam's downstream toe prompted initial concerns that anomalous seepage may be eroding matrix material from the moraine. 235 individual SP measurements covering the surface of the dam were collected in order to investigate electrokinetic current sources resulting from seepage, while resistivity soundings probed moraine stratigraphy and suggest that the till contains interstitial ice. Contoured SP data reveal a non-uniform voltage distribution over the moraine dam and two distinct negative SP anomalies. The first, located in the central area of the moraine, shows a broad negative SP zone around the crest and increasingly positive SP moving downhill towards both the upstream and downstream toes. This anomaly can be explained by shallow gravitational groundwater flow in the near subsurface combined with upward groundwater flux through evapotranspiration; numerical simulation of the combined effect matches field data well. The second SP anomaly has a tightly localized distribution and can be explained by vertically descending flow into a bedrock fault conduit. Our conceptual seepage model suggests that flow travels from Dana Lake first at the boundary of ice-filled moraine and bedrock before converging on a concentrated channel in the subvertical fault zone. Positive SP near the dam abutments results from groundwater inflow from adjacent hillslopes. Combined analyses suggest that seepage erosion is not currently affecting the moraine dam, and that the sediment observed on the bed of the downstream toe lake is likely a remnant of past outflow events.

Moore, Jeffrey R.; Boleve, Alexandre; Sanders, Johnny W.; Glaser, Steven D.

2011-08-01

382

Seismic Design, Analysis, and Remedial Measures to Improve Stability of Existing Earth Dams.  

National Technical Information Service (NTIS)

This report discusses the seismic design of new embankment dams and analysis of existing dams, and possible courses of action to mitigate seismic hazards in the event that analysis indicates unsatisfactory conditions. Also discussed are the use of pseudos...

W. F. Marcuson A. G. Franklin

1983-01-01

383

18. Photocopy of a photographca. 1950showing Lake Hodges Dam in ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. Photocopy of a photograph--ca. 1950--showing Lake Hodges Dam in San Diego County, CA., during a period of low water. Courtesy Mr. Charles Allan Whitney. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

384

Shaking Table Model of a Concrete Gravity Dam for Computer Code Validation Monolithic Model.  

National Technical Information Service (NTIS)

Safety of dams under earthquake loading has always been a major concern in seismically active regions because of the high potential hazard that uncontrolled release of the reservoir poses to the population downstream of the dam. The Bureau of Reclamation ...

T. Payne

1999-01-01

385

76 FR 75542 - Porcupine Dam Hydropower Project; Notice of Preliminary Permit Application Accepted for Filing...  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Project No. 14290-000] Porcupine Dam Hydropower Project; Notice of Preliminary Permit Application Accepted...proposing to study the feasibility of the Porcupine Dam Hydropower Project to be located on the East Fork of the Little...

2011-12-02

386

Butterfly Dam, Cross section AA/South Elevation at Movable Leaf, Longitudinal ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Butterfly Dam, Cross section A-A/South Elevation at Movable Leaf, Longitudinal Section B-B - Chicago Sanitary and Ship Canal, Butterfly Dam, Illinois Waterway River Mile 293.1, Lockport, Will County, IL

387

75 FR 30805 - Gibson Dam Hydroelectric Company, LLC; Notice Soliciting Comments, and Final Terms and Conditions...  

Federal Register 2010, 2011, 2012, 2013

...Project No. 12478-003] Gibson Dam Hydroelectric Company, LLC; Notice Soliciting Comments...2010. Take notice that the following hydroelectric application and applicant-prepared...2009. d. Applicant: Gibson Dam Hydroelectric Company, LLC. e. Name of...

2010-06-02

388

78 FR 5798 - Ceresco Hydroelectric Dam, LLC; Notice of Preliminary Permit Application Accepted for Filing and...  

Federal Register 2010, 2011, 2012, 2013

...Project No. 14462-000] Ceresco Hydroelectric Dam, LLC; Notice of Preliminary Permit...Applications On October 19, 2012, Ceresco Hydroelectric Dam, LLC, filed an application for...study the feasibility of the Ceresco Hydroelectric Project (Ceresco Project or...

2013-01-28

389

75 FR 22122 - Gibson Dam Hydroelectric Company, LLC; Notice of Application Accepted for Filing and Soliciting...  

Federal Register 2010, 2011, 2012, 2013

...Project No.: 12478-003] Gibson Dam Hydroelectric Company, LLC; Notice of Application...2010. Take notice that the following hydroelectric application has been filed with the...2009. d. Applicant: Gibson Dam Hydroelectric Company, LLC. e. Name of...

2010-04-27

390

33 CFR 208.82 - Hetch Hetchy, Cherry Valley, and Don Pedro Dams and Reservoirs.  

Code of Federal Regulations, 2013 CFR

...OF THE ARMY, DEPARTMENT OF DEFENSE FLOOD CONTROL REGULATIONS § 208.82 ...Dam and Reservoir in the interest of flood control, and the City and County...Dam and Reservoir in the interest of flood control all as follows:...

2013-07-01

391

4. Photocopy of a photographWATER SPILLING OVER DAM FROM ISLAND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Photocopy of a photograph--WATER SPILLING OVER DAM FROM ISLAND PLANT - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

392

Methodology for Risk Analysis of Dam Gates and Associated Operating Equipment Using Fault Tree Analysis.  

National Technical Information Service (NTIS)

With limited maintenance dedicated to aging dam spillway gate structures, there is an increased risk of gate inoperability and corresponding dam failure due to malfunction or inadequate design. This report summarizes research on methodologies to assist in...

R. C. Patev C. Putcha S. D. Foltz

2005-01-01

393

Smithland Dam, Ohio River. Foundation Report. Volume II. Photographs and Foundation Maps.  

National Technical Information Service (NTIS)

This report presents complete foundation records of conditions encountered during construction and the methods used to adapt the dam structures to these conditions. The report covers the construction of the Smithland Dam and Weir only. The construction fo...

B. Moser R. Schipp

1983-01-01

394

Smithland Dam, Ohio River. Foundation Report. Volume I. Text, Drawings and Boring Logs.  

National Technical Information Service (NTIS)

This report presents complete foundation records of conditions encountered during construction and the methods used to adapt the dam structures to these conditions. The report covers the construction of the Smithland Dam and Weir only. The construction fo...

R. Schipp B. Moser

1983-01-01

395

76 FR 9341 - Grand River Dam Authority; Notice of Application Accepted for Filing, Soliciting Comments...  

Federal Register 2010, 2011, 2012, 2013

...2011. d. Applicant: Grand River Dam Authority (GRDA). e. Name...f. Location: Grand (Neosho) River in Craig, Delaware, Mayes, and Ottawa Counties...Assistant General Counsel, Grand River Dam Authority, P.O. Box...

2011-02-17

396

Blue Ridge Dam Rehabilitation Project. Fannin County, Georgia. Final Environmental Assessment.  

National Technical Information Service (NTIS)

Shortly after Tennessee Electric Power Company (TEPCO) constructed Blue Ridge Dam in 1931, the penstock1 was damaged due to excessive water pressure. Tennessee Valley Authority (TVA) acquired Blue Ridge Dam from TEPCO in 1939. TVA has periodically lowered...

2009-01-01

397

33 CFR 207.170 - Federal Dam, Oklawaha River, Moss Bluff, Fla.; pool level.  

Code of Federal Regulations, 2013 CFR

...Federal Dam, Oklawaha River, Moss Bluff, Fla.; pool level. 207.170 Section 207.170 Navigation and...Federal Dam, Oklawaha River, Moss Bluff, Fla.; pool level. (a) The level of the pool shall normally be maintained at...

2013-07-01

398

Dam the Wilderness: Building "Green Hydropower" on Big Creek  

NSDL National Science Digital Library

Student must synthesize the data that go into the construction and operation of a large hydroelectric dam. Students must strive to develop a design that minimizes or mitigates the impacts of the dam on the existing watershed. Students divide the analysis and frequently present to each other their findings. These findings are then synthesized into independent reports produced by each student. Designed for a geomorphology course Uses online and/or real-time data Uses geomorphology to solve problems in other fields Addresses student misconceptions

Crosby, Ben

399

Nile River, Lake Nasser, Aswan High Dam, Egypt  

NASA Technical Reports Server (NTRS)

The Aswan High Dam, 2.5 miles across and 364 feet high, (24.0N, 33.0E) completed in 1971, was constructed to supply cheap hydroelectric power to both Egypt and Sudan by impounding, controling and regulating the flood waters of the Nile River in Lake Nasser, the world's second largest artifical lake. The lake extends over 500 miles in length, covers an area of some 2,000 square miles and is as much as 350 feet deep at the face of the dam.

1992-01-01

400

The Sensor Fish - Making Dams More Salmon-Friendly  

SciTech Connect

This article describes the Sensor Fish, an instrument package that travels through hydroelectric dams collecting data on the hazardous conditions that migrating salmon smolt encounter. The Sensor Fish was developed by Pacific Northwest National Laboratory with funding from DOE and the US Army Corps of Engineers and has been used at several federal and utility-run hydroelectric projects on the Snake and Columbia Rivers of the US Pacific Northwest. The article describes the evolution of the Sensor Fish design and provides examples of its use at McNary and Ice Harbor dams.

Carlson, Thomas J.; Duncan, Joanne P.; Gilbride, Theresa L.; Keilman, Geogre

2004-07-31

401

Management plan for White Oak Dam. Revision 1  

SciTech Connect

The purpose is to provide operation and maintenance, periodic inspection, and emergency action plans for White Oak Dam in general accordance with the Federal Emergency Management Agency (FEMA) guidelines for dam safety. It must be understood that operations at the site are primarily for purposes of environmental monitoring, environmental protection and waste management operations control. Effluent is generally allowed to flow from the lake at its natural rate by rising above the broad crested weir notch elevation of 744 feet m.s.l.

Ahmed, S.B.

1997-03-01

402

Compliance Monitoring of Subyearling Chinook Salmon Smolt Survival and Passage at Bonneville Dam, Summer 2012  

SciTech Connect

The purpose of this compliance study was to estimate dam passage survival of subyearling Chinook salmon at Bonneville Dam during summer 2012, as required by the 2008 Federal Columbia River Power System Biological Opinion. The study also estimated smolt passage survival from the forebay 2 km upstream of the dam to the tailrace 1 km below the dam, as well as forebay residence time, tailrace egress, and spill passage efficiency, as required in the 2008 Columbia Basin Fish Accords.

Skalski, J. R.; Townsend, Richard L.; Seaburg, Adam; Ploskey, Gene R.; Weiland, Mark A.; Hughes, James S.; Woodley, Christa M.; Deng, Zhiqun; Carlson, Thomas J.

2013-05-01

403

DAM IMPACTS ON AND RESTORATION OF AN ALLUVIAL RIVER - RIO GRANDE, NEW MEXICO  

Microsoft Academic Search

The impact of construction of dams and reservoirs on alluvial rivers extends both upstream and downstream of the dam. Downstream of dams, both the water and sediment supplies can be altered leading to adjustments in the river channel geometry and ensuing changes in riparian and aquatic habitats. The wealth of pre and post-regulation data on the Middle Rio Grande, New

Gigi RICHARD; Pierre JULIEN

2004-01-01

404

Ecosystem-Level Consequences of Migratory Faunal Depletion Caused by Dams  

Microsoft Academic Search

Humans have been damming rivers for millennia, and our more ambitious efforts over the past century have arguably altered river ecosystems more extensively than any other anthropogenic activity. Effects of damming on river biota include decimation of migratory fauna (e.g., diadromous and potamodromous fishes and crustaceans), lost fisheries, and imperilment of obligate riverine taxa. Although effects of dams on biota

MARY C. FREEMAN; CATHERINE M. PRINGLE; EFFIE A. GREATHOUSE; BYRON J. FREEMAN

2003-01-01

405

Defining Successful Dam Removal and Shifting the Focus of Restoration; A Midwest Perspective  

Microsoft Academic Search

The number of dam removals in the US has increased in the last decade because design lives are being exceeded for an increasing number of dams, and because interest groups have pushed for removal as part of attempts to restore river ecology. Large numbers of small dams have been removed, despite the paucity of information regarding the physical and biological

A. R. Selle; M. W. Doyle; E. H. Stanley; J. M. Harbor; D. A. Lyn

2002-01-01

406

43 CFR 418.23 - Diversion of Rock Dam Ditch water.  

Code of Federal Regulations, 2013 CFR

... 2013-10-01 false Diversion of Rock Dam Ditch water. 418.23 Section...Management § 418.23 Diversion of Rock Dam Ditch water. Project water may be diverted directly to Rock Dam Ditch from the Truckee Canal only...

2013-10-01

407

Strain Analysis in Horizontal Geodetic Network of Dams for Control of Stability and Monitoring Deformation  

Microsoft Academic Search

Dams as one of the engineering structures play very important role in human life. Because, from primary human needs such as providing drinking water to professional needs such as water powerhouse creation in order to provide power for industrial centers, hospitals, manufactures and agriculture, have considerable dependent on dams. In addition destruction of a dam can be as dangerous as

S. Roohi; A. A. Ardalan; M. Khodakarami

2009-01-01

408

"No. 182. Grand Valley Diversion Dam. June, 1917. R.B.D." Structures ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

"No. 182. Grand Valley Diversion Dam. June, 1917. R.B.D." Structures on the west side of the river below the dam are three bunkhouses, a mess hall, hospital, doctor's residence, engineer's residence, and outbuildings." - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

409

75 FR 81464 - Safety Zone; Columbia River, The Dalles Lock and Dam  

Federal Register 2010, 2011, 2012, 2013

...Zone; Columbia River, The Dalles Lock and Dam AGENCY: Coast Guard, DHS. ACTION: Temporary...River in the vicinity of The Dalles Lock and Dam while the Army Corps of Engineers completes...Zone; Columbia River, The Dalles Lock and Dam (a) Location. The following is a...

2010-12-28

410

30 CFR 715.18 - Dams constructed of or impounding waste material.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Dams constructed of or impounding waste material...GENERAL PERFORMANCE STANDARDS § 715.18 Dams constructed of or impounding waste material...used in or impounded by existing or new dams without the approval of the...

2009-07-01

411

76 FR 54487 - Charter Renewal, Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...Reclamation Charter Renewal, Glen Canyon Dam Adaptive Management Work Group AGENCY...renewing the charter for the Glen Canyon Dam Adaptive Management Work Group. The purpose...respect to the operation of Glen Canyon Dam and the exercise of other authorities...

2011-09-01

412

30 CFR 717.18 - Dams constructed of or impounding waste material.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Dams constructed of or impounding waste material...GENERAL PERFORMANCE STANDARDS § 717.18 Dams constructed of or impounding waste material...used in or impounded by existing or new dams without the approval of regulatory...

2010-07-01

413

78 FR 34258 - Safety Zone; Salvage Operations at Marseilles Dam; Illinois River  

Federal Register 2010, 2011, 2012, 2013

...Zone; Salvage Operations at Marseilles Dam; Illinois River AGENCY: Coast Guard...extending 600 yards upstream of the Marseilles Dam to Mile Marker 247.2. This zone is intended...operations and repair efforts at the Marseilles Dam. This safety zone is necessary to...

2013-06-07

414

30 CFR 717.18 - Dams constructed of or impounding waste material.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Dams constructed of or impounding waste material...GENERAL PERFORMANCE STANDARDS § 717.18 Dams constructed of or impounding waste material...used in or impounded by existing or new dams without the approval of regulatory...

2009-07-01

415

78 FR 42799 - Glen Canyon Dam Adaptive Management Work Group Meetings  

Federal Register 2010, 2011, 2012, 2013

...X30-0594-0913-700-00-0-0, 4073000] Glen Canyon Dam Adaptive Management Work Group Meetings...SUMMARY: The Glen Canyon Dam Adaptive Management Work Group (AMWG...Secretary of the Interior concerning Glen Canyon Dam operations and other management...

2013-07-17

416

Steelhead Emigration in a Seasonal Impoundment Created by an Inflatable Rubber Dam  

Microsoft Academic Search

While large, permanent dams and reservoirs are known to impede smolt movements, investigations of small, temporary impoundments are scarce. Inflatable rubber bladder dams are used to create temporary impoundments worldwide, yet downstream fish passage at these structures has not been evaluated. To examine smolt emigration in a seasonal water supply reservoir and passage at a rubber dam, we tracked 110

David J. Manning; Jonathon A. Mann; Sean K. White; Shawn D. Chase; Ron C. Benkert

2005-01-01

417

HEC-RAS DAM BREAK MODELING OF GWINNETT COUNTY'S NRCS FACILITIES  

Microsoft Academic Search

The potential flood risk caused by dam failure is often more severe and can behave very different to that of natural flooding events. The tragedy of dam failure is all too familiar to Georgia with the failure of the Kelly Barnes dam near Toccoa Georgia which resulted in 39 deaths in the early hours of November 6th 1977. Floodplain maps

Sam Crampton

418

33 CFR 208.22 - Twin Buttes Dam and Reservoir, Middle and South Concho Rivers, Tex.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Twin Buttes Dam and Reservoir, Middle and...FLOOD CONTROL REGULATIONS § 208.22 Twin Buttes Dam and Reservoir, Middle and South...its designated agent, shall operate the Twin Buttes Dam and Reservoir in the...

2010-07-01

419

33 CFR 208.22 - Twin Buttes Dam and Reservoir, Middle and South Concho Rivers, Tex.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Twin Buttes Dam and Reservoir, Middle and...FLOOD CONTROL REGULATIONS § 208.22 Twin Buttes Dam and Reservoir, Middle and South...its designated agent, shall operate the Twin Buttes Dam and Reservoir in the...

2009-07-01

420

Seismic Testing of a 1/20 Scale Model of Koyna Dam.  

National Technical Information Service (NTIS)

In 1967, the Koyna mass concrete dam in India was seriously damaged by a magnitude 6.5 earthquake. The event is unique because the Koyna Dam is the only concrete dam to be significantly damaged due to ground shaking, and accelerometers at the site recorde...

J. Wilcoski R. L. Hall J. B. Gambill E. E. Matheu M. R. Chowdhury

2001-01-01

421

33 CFR 208.32 - Sanford Dam and Lake Meredith, Canadian River, Tex.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Sanford Dam and Lake Meredith, Canadian River, Tex. 208...REGULATIONS § 208.32 Sanford Dam and Lake Meredith, Canadian River, Tex. The...agent, shall operate the Sanford Dam and Lake Meredith in the interest of flood...

2013-07-01

422

33 CFR 208.29 - Arbuckle Dam and Lake of the Arbuckles, Rock Creek, Okla.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Arbuckle Dam and Lake of the Arbuckles, Rock Creek, Okla...REGULATIONS § 208.29 Arbuckle Dam and Lake of the Arbuckles, Rock Creek, Okla...agent, shall operate the Arbuckle Dam and Lake of the Arbuckles in the interest of...

2013-07-01

423

33 CFR 208.34 - Norman Dam and Lake Thunderbird, Little River, Okla.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Norman Dam and Lake Thunderbird, Little River, Okla. 208...REGULATIONS § 208.34 Norman Dam and Lake Thunderbird, Little River, Okla. ...designated agent, shall operate Norman Dam and Lake Thunderbird in the interest of flood...

2013-07-01

424

43 CFR 431.7 - Administration and management of the Colorado River Dam Fund.  

Code of Federal Regulations, 2012 CFR

...Administration and management of the Colorado River Dam Fund. 431.7 Section 431.7...Administration and management of the Colorado River Dam Fund. Reclamation is responsible...Project and the administration of the Colorado River Dam Fund and the Lower Colorado River...

2012-10-01

425

43 CFR 431.7 - Administration and management of the Colorado River Dam Fund.  

Code of Federal Regulations, 2011 CFR

...Administration and management of the Colorado River Dam Fund. 431.7 Section 431.7...Administration and management of the Colorado River Dam Fund. Reclamation is responsible...Project and the administration of the Colorado River Dam Fund and the Lower Colorado River...

2011-10-01

426

Modeling the costs and benefits of dam construction from a multidisciplinary perspective  

Microsoft Academic Search

Although the benefits of dam construction are numerous, particularly in the context of climate change and growing global demand for electricity, recent experience has shown that many dams have serious negative environmental, human, and political consequences. Despite an extensive literature documenting the benefits and costs of dams from a single disciplinary perspective, few studies have simultaneously evaluated the distribution of

Philip H. Brown; Desiree Tullos; Bryan Tilt; Darrin Magee; Aaron T. Wolf

2009-01-01

427

The New Great Walls: A Guide to China's Overseas Dam Industry  

Microsoft Academic Search

The purpose of this guide is to support groups addressing the impacts of dams built by Chinese companies and financiers. The guide is intended for use by non-governmental organizations (NGOs) and individuals working with communities affected by these dams. It describes how Chinese companies and financiers and the Chinese government are involved in overseas dams.

2011-01-01

428

43 CFR 431.7 - Administration and management of the Colorado River Dam Fund.  

Code of Federal Regulations, 2013 CFR

...Administration and management of the Colorado River Dam Fund. 431.7 Section 431.7...Administration and management of the Colorado River Dam Fund. Reclamation is responsible...Project and the administration of the Colorado River Dam Fund and the Lower Colorado River...

2013-10-01

429

Nile sediment dispersal altered by the Aswan High Dam: The kaolinite trace  

Microsoft Academic Search

Proportions of kaolinite have increased substantially in lower River Nile clay mineral assemblages since emplacement in 1964 of the High Dam at Aswan, Egypt. Monitoring this recent increase can be used to help gauge sediment load changes induced by the High Dam in the lower River Nile, between the dam and Nile delta and, eventually, offshore in the Mediterranean's Levantine

Daniel Jean Stanley; Jonathan G. Wingerath

1996-01-01

430

Sliding response of gravity dams including vertical seismic accelerations  

NASA Astrophysics Data System (ADS)

Seismic safety assessment of gravity dams has become a major concern in many regions of the world while the effects of vertical seismic accelerations on the response of structures remain poorly understood. This paper first investigates the effect of including vertical accelerations in the sliding response analysis of gravity dams subjected to a range of historical ground motion records separated in two groups according to their source-to-site distance. Analyses showed that the incidence of vertical accelerations on the sliding response of gravity dams is significantly higher for near-source records than for far-source records. The pseudo-static 30% load combination rule, commonly used in practice to account for the non-simultaneous occurrence of the peak horizontal and vertical accelerations, yielded good approximations of the minimum safety factors against sliding computed from time-history analyses. A method for empirically estimating the vertical response spectra based on horizontal spectra, accounting for the difference in frequency content and amplitudes between the two components is investigated. Results from analyses using spectrum compatible horizontal and vertical synthetic records also approximated well the sliding response of a gravity dam subjected to series of simultaneous horizontal and vertical historical earthquake records.

Christopoulos, Constantin; Léger, Pierre; Filiatrault, André

2003-12-01

431

Flooding Caused by the Collapse of the Zeyzoun Dam, Syria  

NASA Technical Reports Server (NTRS)

On Tuesday the Zeyzoun dam in northern Syria ruptured and collapsed, killing 20 people and leaving thousands more homeless. This false-color image taken on June 5, 2002, (bottom) by the Moderate-resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA's Terra satellite shows the extent of the flooding. Normally, there would be no water present in the center of the image (top, acquired on June 3, 2002). After the dam burst, 71 million cubic meters flowed onto the surrounding landscape and washed over an area of 20,000 acres. Hundreds of homes were destroyed in and around the villages of Zeyzoun, Qastoun, and Ziara, roughly 220 miles (350 kilometers) north of Damascus. Most of the residents fled to higher ground with the help of two helicopters. The Syrians originally constructed the dam to contain the Orontes River and provide a steady flow of water to the surrounding farms, many of which were lost. Rescue workers worry that more bodies may be found as the waters of the dam recede. The Japanese government issued more than $40,000 in aid for the victims, and the Syrian government is petitioning international aid agencies for further assistance. In this false-color image, the ground is sage green and rusty orange, and water is black. Clouds appear pink. Image courtesy Jacques Descloitres, MODIS Land Rapid Response Team at NASA GSFC

2002-01-01

432

Methods for Estimating the Impact of Hypothetical Dam Break Floods  

Microsoft Academic Search

This paper presents a method for estimating the impact of floods resulting from dam failure. These methods were developed for implementation at the Pacific Disaster Center in Hawaii. A hydraulic model embedded in a Geographic Information System (GIS) is used to estimate the downstream attenuation of the flood. The model output is then integrated with a Digital Elevation Model in

Jene Michaud; Carl Johnson; Judy Iokepa; Jillian Marohnic

433

Damming the Amazon: Local Movements and Transnational Struggles Over Water  

Microsoft Academic Search

Growing contestation has arisen in the Brazilian Amazon regarding two proposed large hydroelectric dam complexes: Belo Monte and Rio Madeira. I explore the intersections between transnational and local contestation of these projects over time. I specifically focus on how scientific research and technical assessments are the field upon which these two different levels of activism operate, reflecting the importance of

Sabrina McCormick

2010-01-01

434

1. VIEW NORTHEAST OF WHEELHOUSE AREA, TAILRACE (CENTER), AND DAM; ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW NORTHEAST OF WHEELHOUSE AREA, TAILRACE (CENTER), AND DAM; MILL NO. 5 (HAER No. CT-44-B) AND BRIDGE AT RIGHT - Willimantic Linen Company, Mill No. 1, Immediately West of South Main Street, North Bank of Willimantic River, Windham, Windham County, CT

435

2. VIEW LOOKING NORTH OF GUARDLOCK (LEFT REAR), DUNDEE DAM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW LOOKING NORTH OF GUARDLOCK (LEFT REAR), DUNDEE DAM (RIGHT-CENTER REAR), AND REMOVED SITE OF TOWPATH (FOREGROUND) DURING HYDROPOWER FACILITY INSTALLATION - Dundee Canal, Headgates, Guardlock & Uppermost Section, 250 feet northeast of Randolph Avenue, opposite & in line with East Clifton Avenue, Clifton, Passaic County, NJ

436

Enloe Dam Passage Project, Volume I, 1984 Annual Report.  

SciTech Connect

This report discusses issues related to the provision of fish passage facilities at Enloe Dam and the introduction of anadromous salmonid fish to the upper Similkameen River basin. The species of fish being considered is a summer run of steelhead trout adapted to the upper Columbia basin. (ACR)

Fanning, M.L.

1985-07-01

437

20. Detail of low crib dam and apron, looking north. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. Detail of low crib dam and apron, looking north. Building across river is part of Muckleshoot Indian fish hatchery, constructed in 1989. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

438

White Oak Dam stability analysis. Appendix. Volume II  

SciTech Connect

A parametric study was conducted to evaluate the stability of the White Oak Dam (WOD) embankment and foundation. Slope stability analyses were performed for the upper and lower bound soil properties at three sections of the dam using the PCSTABL4 computer program. Minimum safety factors were calculated for the applicable seismic and static loading conditions. Liquefaction potential of the dam embankment and foundation solid during the seismic event was assessed by using simplified procedures. The WOD is classified as a low hazard facility and the Evaluation Basis Earthquake (EBE) is defined as an earthquake with a magnitude of m{sub b} = 5.6 and a Peak Ground Accelerator (PGA) of 0.13 g. This event is approximately equivalent to a Modified Mercalli Intensity of VI-VIII. The EBE is used to perform the seismic evaluation for slope stability and liquefaction potential. Results of the stability analyses and the liquefaction assessment lead to the conclusion that the White Oak Dam is safe and stable for the static and the seismic events defined in this study. Ogden Environmental, at the request of MMES, has checked and verified the calculations for the critical loading conditions and performed a peer review of this report. Ogden has determined that the WOD is stable under the defined static and seismic loading conditions and the embankment materials are in general not susceptible to liquefaction.

Ahmed, S.B.

1994-01-01

439

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2013 CFR

...Canal must be managed to achieve an average terminal flow of 20 cfs or less during times when diversions to Lahontan Reservoir...measured by the gauge below Derby Dam, is less than or equal to 100 cfs. (e) Diversions to the Truckee Canal will be...

2013-10-01

440

Sealing the joints of the Andizhan concrete dam  

Microsoft Academic Search

Conclusions 1.The methods of installing the embedded grouting accessories and the technology of grouting provided filling of the joints and cavities in the dam with grout, imparting to it the necessary rigidity and sufficient degree of solidity, which was confirmed by the data of on-site observations of the state of stress and strain of the structures. The effectiveness of secondary

É. S. Argal; V. M. Ermoshin

1984-01-01

441

Rollcrete gravity dams and methods of its tiered construction  

Microsoft Academic Search

Conclusions 1.To eliminate the joint between the upstream zone of ordinary concrete and internal zone of rollcrete, a design of a gravity dam is proposed with the construction of a sawtooth joint between these zones, which is obtained by tiered placement at first of 2–4 layers of rollcrete and then concrete of the upstream zone with the use of the

E. A. Kogan; V. I. Sakharov

1988-01-01

442

Building a DAM To Last: Archiving Digital Assets.  

ERIC Educational Resources Information Center

Discusses archiving digital information and the need for organizations to develop policies regarding digital asset management (DAM) and storage. Topics include determining the value of digital assets; formats of digital information; use of stored information; and system architecture, including hardware and asset management software. (LRW)

Zeichick, Alan

2003-01-01

443

Ecotoxicological assessment of water pollution in Sariyar Dam Lake, Turkey  

Microsoft Academic Search

Given the effects of environmental pollution and different biotic factors on some important biochemical markers, as enzymes, two fish species inhabiting the Sariyar Dam Lake, Turkey have been investigated. Ethoxyresorufin O-deethylase, glutathion S-transferase, lactate dehydrogenase, alkaline phosphatase, acid phosphatase, and alanine and aspartate amino transferase activities have been measured in liver samples of Cyprinus carpio and Capoeta tinca. Also, brain

Murat Ozmen; Zafer Ayas; Abbas Güngördü; Guler F. Ekmekci; Sedat Yerli

2008-01-01

444

21. Newly completed Lake Hodges Dam and Flume, 1919. Courtesy ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

21. Newly completed Lake Hodges Dam and Flume, 1919. Courtesy of the Mandeville Department of Special Collection, Central Library, University of California, San Diego. - Lake Hodges Flume, Along San Dieguito River between Lake Hodges & San Dieguito Reservoir, Rancho Santa Fe, San Diego County, CA

445

EMergy analysis perspectives of Thailand and Mekong River dam proposals  

Microsoft Academic Search

Methods of EMergy analysis (a scientifically based measure of wealth with units of solar emjoules [sej]) are explained and illustrated, using the economy of Thailand and two proposed dams on the Mekong River. Thailand's EMergy\\/$ ratio is near the world average (3.46 · 1012 sej\\/$), its EMergy per capita ratio (2.98 · 1015 sej\\/capita) is low compared to developed economies

M. T. Brown; T. R. McClanahan

1996-01-01

446

Dams and geomorphology: Research progress and future directions  

Microsoft Academic Search

Dams impose changes of flow and sediment transfer that drive changes of channel form along the downstream regulated river. These changes have been described for more than 50 years but process-form relationships have only been advanced with the establishment of a conceptual framework during the 1970s, and then the extension of monitoring data and advancement of remote sensing technologies, particularly

Geoffrey E. Petts; Angela M. Gurnell

2005-01-01

447

The Aswan Dam: A Lesson on Man's Environmental Impact.  

ERIC Educational Resources Information Center

This curriculum unit was prepared for senior high classroom use to teach geography, history, and environmental issues. The objective of the lesson is to illustrate the historical man/river relationship between Egypt and the Nile River, and the impact of the Aswan dam on the agricultural and economic needs of the country today. The lesson requires…

Peterson, Burnell

448

Sediment trapping by dams creates methane emission hot spots.  

PubMed

Inland waters transport and transform substantial amounts of carbon and account for ?18% of global methane emissions. Large reservoirs with higher areal methane release rates than natural waters contribute significantly to freshwater emissions. However, there are millions of small dams worldwide that receive and trap high loads of organic carbon and can therefore potentially emit significant amounts of methane to the atmosphere. We evaluated the effect of damming on methane emissions in a central European impounded river. Direct comparison of riverine and reservoir reaches, where sedimentation in the latter is increased due to trapping by dams, revealed that the reservoir reaches are the major source of methane emissions (?0.23 mmol CH4 m(-2) d(-1) vs ?19.7 mmol CH4 m(-2) d(-1), respectively) and that areal emission rates far exceed previous estimates for temperate reservoirs or rivers. We show that sediment accumulation correlates with methane production and subsequent ebullitive release rates and may therefore be an excellent proxy for estimating methane emissions from small reservoirs. Our results suggest that sedimentation-driven methane emissions from dammed river hot spot sites can potentially increase global freshwater emissions by up to 7%. PMID:23799866

Maeck, Andreas; Delsontro, Tonya; McGinnis, Daniel F; Fischer, Helmut; Flury, Sabine; Schmidt, Mark; Fietzek, Peer; Lorke, Andreas

2013-08-01

449

Strengthening of certain types of arch dams at broad sites  

SciTech Connect

The problem of strengthening defective and damaged arch dams is formulated, and methodical calculations are performed to substantiate a set of structural and production measures permitting substantial improvement in the stress-strain state and an increase in the safety factor of the structure. Feasibility of practical implementation of the results is foreseen.

Kaganov, G. M.; Volkov, V. I.; Uchevatkin, A. A. [FGOU VPO Moscow State University of the Natural Environment (Russian Federation)

2012-01-15

450

2. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, PHOTOGRAPHIC COPY OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SNAKE RIVER VALLEY IRRIGATION DISTRICT DAM, PHOTOGRAPHIC COPY OF DRAWING, PLAN, SHEET 5 OF 5, 1924 (on file at the Idaho State Office of Water Resources, Boise, Idaho) - Snake River Valley Irrigation District, East Side of Snake River (River Mile 796), Shelley, Bingham County, ID

451

Monitoring of soil nailed slopes and dams using innovative technologies  

Microsoft Academic Search

This paper presents (a) an integrated automatic real-time slope monitoring system using a conventional slope monitoring package and a multi-antenna Global Positioning System (GPS) package and the field monitoring results, (b) monitoring of soil nailed slopes by optical fiber strain sensors, and (c) moni- toring of a model dam by optical fiber sensing bars. The authors also introduce new developments

Jian-Hua Yin; Hong-Hu Zhu; Wei Jin

2008-01-01

452

Spill Alert Device for Earth Dam Failure Warning.  

National Technical Information Service (NTIS)

A spill alert device for determining earth dam safety based on the monitoring of the acoustic emissions generated in a deforming soil mass was developed and field-tested. The acoustic emissions are related to the basic mechanisms from which soils derive t...

R. M. Koerner A. E. Lord

1984-01-01

453

VIEW OF DOWNSTREAM SIDE OF CHECK DAM, CONCRETE SPILLWAY WITH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF DOWNSTREAM SIDE OF CHECK DAM, CONCRETE SPILLWAY WITH MORTARED ROCK WALLS, AND CIPPOLETTI WEIR ON TUMALO RESERVOIR FEED CANAL NEAR COLLINS ROAD (IN BACKGROUND). LOOKING NORTHEAST - Tumalo Irrigation District, Tumalo Project, West of Deschutes River, Tumalo, Deschutes County, OR

454

Tellico Project - A Dam on the Little Tennessee River, Tennessee.  

National Technical Information Service (NTIS)

The Tellico Project is in Blount, Loudon and Monroe Counties in East Tennessee. The major element of the project is a dam on the Little Tennessee River about one quarter mile above its confluence with the Tennessee River and about 1 mile southwest of TVA'...

1971-01-01

455

Impact of Dam and Lake Construction on Rural Economies.  

National Technical Information Service (NTIS)

This report is an assessment of the social and economic impact of five dam and lake projects constructed by the Corps of Engineers. Four of the lake projects are located in Kansas, and one in Missouri. Factors used to examine the impact were land use, pop...

D. Gjesdahl W. Drake

1979-01-01

456

26. View of the dam between the middle and lower ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

26. View of the dam between the middle and lower raceways from the upstream side, with the Waverly Mill and other buildings of the Allied Textile Printers complex in the background. - Great Falls/S. U. M. Power Canal System, Paterson, Passaic County, NJ

457

McNary Dam Smolt monitoring program. Annual report, 1991.  

National Technical Information Service (NTIS)

The Washington Department of Fisheries assumed responsibility for the Smolt Monitoring Program at McNary Dam in 1990. This report summarizes the 1991 McNary smolt monitoring season. The 1991 smolt monitoring season was extended concurrent with a WDF fallb...

P. Wagner

1991-01-01

458

3. VIEW OF WEST TAILING DAM, LARGE TANK, AND TAILING, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW OF WEST TAILING DAM, LARGE TANK, AND TAILING, LOOKING NORTHEAST. A SIX-FOOT SCALE IS LOCATED AGAINST WALL ON LEFT. PURPOSE OF TANK IS UNKNOWN, BUT APPEARS TO HAVE FALLEN FROM ITS ORIGINAL LOCATION AT THE MILL SITE, UP AND TO THE RIGHT OF THIS VIEW. - Skidoo Mine, Park Route 38 (Skidoo Road), Death Valley Junction, Inyo County, CA

459

2. VIEW OF EAST TAILING DAM (FOREGROUND), LOOKING EAST SOUTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF EAST TAILING DAM (FOREGROUND), LOOKING EAST SOUTHEAST UP WASH TOWARD ORE BIN, OVERBURDEN, ADITS, AND ROAD SHOWN IN CA-290-1. MILL SITE IS UP AND TO THE RIGHT OF THIS VIEW. STANDARD FIFTY-GALLON DRUM IN FOREGROUND GIVES SCALE OF WALL. - Skidoo Mine, Park Route 38 (Skidoo Road), Death Valley Junction, Inyo County, CA

460

Water Quality Management at Harry S. Truman Dam and Reservoir.  

National Technical Information Service (NTIS)

Harry S. Truman Dam is located in west central Missouri on the Osage River and in the headwaters of the well known Lake of the Ozarks, which is one of the most highly developed recreational lakes in the entire Midwest. Construction and operation of the Ha...

W. M. Linder

1982-01-01

461

Simulation of Soil Moisture Development in Flood Protecting Earth Dams  

Microsoft Academic Search

Extreme floods represent an increased risk for urban areas and agriculture. Time to time the protective earth dams are destroyed by a suddenly increased amount of water with destroing or even cathastrophic consequences. A numerical study of the soil moisture development within the earth body during the flood is simulated under a selection of boundary conditions. Several soil materials are

M. Cislerova; D. Zumr; J. Dusek; T. Vogel

2007-01-01

462

Klamath River Water Quality Data from Link River Dam to Keno Dam, Oregon, 2008  

USGS Publications Warehouse

This report documents sampling and analytical methods and presents field data from a second year of an ongoing study on the Klamath River from Link River Dam to Keno Dam in south central Oregon; this dataset will form the basis of a hydrodynamic and water quality model. Water quality was sampled weekly at six mainstem and two tributary sites from early April through early November, 2008. Constituents reported herein include field-measured water-column parameters (water temperature, pH, dissolved oxygen concentration, specific conductance); total nitrogen and phosphorus; particulate carbon and nitrogen; total iron; filtered orthophosphate, nitrite, nitrite plus nitrate, ammonia, organic carbon, and iron; specific UV absorbance at 254 nanometers; chlorophyll a; phytoplankton and zooplankton enumeration and species identification; and bacterial abundance and morphological subgroups. Sampling program results indicated: *Most nutrient and carbon concentrations were lowest in spring, increased starting in mid-June, remained elevated in the summer, and decreased in fall. Dissolved nitrite plus nitrate had a different seasonal cycle and was below detection or at low concentration in summer. *Although total nitrogen and total phosphorus concentrations did not show large differences from upstream to downstream, filtered ammonia and orthophosphate concentrations increased in the downstream direction and particulate carbon and particulate nitrogen generally decreased in the downstream direction. *Large bacterial cells made up most of the bacteria biovolume, though cocci were the most numerous bacteria type. Cocci, with diameters of 0.1 to 0.2 micrometers, were smaller than the filter pore sizes used to separate dissolved from particulate matter. *Phytoplankton biovolumes were dominated by diatoms in spring and by the blue-green alga Aphanizomenon flos-aquae after mid-June. Another blue-green, Anabaena flos-aquae, was noted in samples from late May to late June. Phytoplankton biovolumes generally were highest at the upstream Link River and Railroad Bridge sites and decreased in the downstream direction. *Zooplankton densities were largest in late April. Populations were dominated by rotifers and copepods in early spring, and by rotifers and cladocerans in summer, with cladocerans most common at the most upstream site.

Sullivan, Annett B.; Deas, Michael L.; Asbill, Jessica; Kirshtein, Julie D.; Butler, Kenna; Vaughn, Jennifer

2009-01-01

463

Serologic survey for Leptospira spp. in captive neotropical felids in Foz do Iguaçu, Paraná, Brazil.  

PubMed

Leptospirosis is a bacterial zoonosis of worldwide distribution and is endemic in tropical countries, where rodents and other wild mammals are abundant and may act as reservoirs. Leptospirosis has become a concern in captive wild animals, due mostly to their exposure to contaminated urine or environment. Although domestic cats (Felis catus) have been reported refractory to leptospirosis, serology and disease in captive wild felids is still unclear. In this study 57 adult, clinically healthy felids, including 1 Geoffroy's cat (Leopardus geoffroyi), 3 jaguarundis (Puma yagouaroundi), 17 margays (Leopardus wiedii), 22 little spotted cats (Leopardus tigrinus), and 14 ocelots (Leopardus pardalis) kept in captivity at the Sanctuary at the Itaipu Binacional hydroelectric power plant (Bela Vista Biological Sanctuary), Foz do Iguacu City, Paraná State, Brazil, were serologically surveyed for the presence of antibodies against 28 serovars of Leptospira spp. by microagglutination test (MAT). Two animals (3.5%) were seropositive: one male ocelot to the serovar Cynopteri (titer 100) and one female margay to Autumnalis (100) and Butembo (200). The captive-born, 5-yr-old ocelot had been solitary housed in an individual cage. The approximately 21-yr-old wild-caught margay was also kept individually. None of the tested animals showed signs ofleptospirosis. During a study conducted 4 yr previously in the same facility, this particular margay also tested positive for the same two serovars, among others. The present study indicates that the felids tested for Leptospira spp. by MAT were exposed to serovars, but did not demonstrate clinical signs of disease. Comparison with a previous study suggests that serovar titers may vary over time and that leptospirosis dynamics remains unclear in wild felids. PMID:22779223

Ullmann, Leila Sabrina; Hoffmann, Juliano L; de Moraes, Wanderlei; Cubas, Zalmir S; dos Santos, Leonilda Correia; da Silva, Rodrigo Costa; Moreira, Nei; Guimaraes, Ana Marcia Sa; Camossi, Lucilene Granuzzio; Langoni, Helio; Biondo, Alexander W

2012-06-01

464

Compliance Monitoring of Subyearling Chinook Salmon Survival and Passage at The Dalles Dam, Summer 2012  

SciTech Connect

The purpose of this compliance study was to estimate dam passage survival of subyearling Chinook salmon at The Dalles Dam during summer 2012. Under the 2008 Federal Columbia River Power System Biological Opinion, dam passage survival is required to be greater than or equal to 0.93 and estimated with a standard error (SE) less than or equal to 0.015. The study also estimated survival from the forebay 2 km upstream of the dam and through the tailrace to 2 km downstream of the dam, forebay residence time, tailrace egress time, spill passage efficiency (SPE), and fish passage efficiency (FPE), as required by the 2008 Columbia Basin Fish Accords.

Skalski, J. R.; Townsend, Richard L.; Seaburg, Adam; Ploskey, Gene R.; Weiland, Mark A.; Hughes, James S.; Woodley, Christa M.; Deng, Zhiqun; Carlson, Thomas J.; Johnson, Gary E.

2013-05-01

465

National Program for Inspection of Non-Federal Dams. Berry Brook Dam, (NH 00313), State Number 83.06, Piscataqua River Basin, Farmington, New Hampshire. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam is a concrete gravity dam with a hydraulic height of 24 ft. and is 269 ft. long. The dam is in fair condition. There are a few concerns which should be remedied. It is small in size with a significant hazard potential. A major breach at top of dam...

1979-01-01

466

National Dam Inspection Program. Mill Water Dam (NDS I.D. Number PA 00703, DER I.D. Number 6-442), Susquehanna River Basin, Back Creek, Berks County, Pennsylvania. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Mill Water Pond Dam is owned by the Bethlehem Mines Corporation. The dam was originally built as an industrial water supply dam for the Grace Mine. As the mine is no longer in operation, water from the reservoir is no longer used. The dam and its appurten...

M. F. Beck J. H. Frederick

1980-01-01

467

Earthquake Risk Classes for dams situated in the Romanian Moesian Platform and Loss Estimates Scenario due to Ramnicu Valcea Dam collapse  

NASA Astrophysics Data System (ADS)

The main goal of this paper is the probabilistic assessment of the seismic hazard in the Moesian Platform due to intemediate-depth and crustal earthquakes and the rating of all dams from the zone into seismic risk classes. The second goal is to realise a scenario of loss estimates in the case of one of the largest dams from the Moesian Platform, the Ramnicu Valcea Dam. Dam owners and regulators must ensure that dams are safely operated and present no risk to the public in case of an earthquake. While most old or new dams in recognized seismic regions have been evaluated and analyzed for seismic loads, dams located in areas of moderate or infrequent seismicity have been given less systematic attention. In such cases, owners of many dams or officials in charge of dam safety programs may consider comparative assessment of the seismic risk associated with their dams and establish priorities, as needed. Risk classes can be used to establish the necessity of detailed assessment of seismic safety of the dams and to establish the priorities of these evaluations. Methodology which is used in this paper offers an easy way to evaluate the most vulnerable hydrotechnical facilities among the multitude of the Romanian dams, that are affected by normal and intermediate-depth Vrancea earthquakes. Generally the risk is expressed as a product between hazard and vulnerability. In particular, seismic risk in the case of hydrotechnical arrangements is computed as a product between seismic hazard (corresponding to the location of the respective hydrotechnical arrangement) and the seismic vulnerability of the respective arrangement. Various risk factors and weighting points can be used to approximately quantify the Total Risk Factor (TRF) of any dam [Bureau and Ballentine, 2002]. The TRF depends on the dam type, age, size, the downstream risk potential, and the dam vulnerability, which depends on the seismic hazard of the site. The dam structure influence is represented by the sum of capacity, height, and age risk factors. The downstream hazard factor is based on population and property at risk.

Moldovan, I. A.; Constantin, A. P.; Popescu, E.; Placinta, A. O.; Moldoveanu, T.

2009-04-01

468

National Program for Inspection of Non-Federal Dams. Sawyer Pond Dam (MA 00050), Connecticut River Basin, Northfield, Massachusetts.  

National Technical Information Service (NTIS)

Sawyer Pond Dam is a 170 year old earth embankment about 150 feet long with a top width of 40 feet and a maximum height of about 27 feet. Both the upstream, and downstream slopes are approximately 1H:1V. The concrete drop box inlet spillway has a crest le...

1981-01-01

469

Outlet Works for Cerrillos Dam, Cerrillos River, and Portugues Dam, Portugues River, Puerto Rico; Hydraulic Model Investigation.  

National Technical Information Service (NTIS)

Tests were conducted on a 1:24-scale model of the outlet works for the Cerrillos and Portugues Dams located in Puerto Rico. The purpose of the model investigation was to determine the performance of the stilling basins for the full range of discharges wit...

J. F. George

1979-01-01

470

National Dam Safety Program. Goshen Dam, Inventory Number: VA-16301. Rockbridge County, Virginia. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Pursuant to Public Law 92-367, Phase I Inspection Reports are prepared under guidance contained in the recommended guidelines for safety inspection of dams, published by the Office of Chief of Engineers, Washington, D. C. 20314. The purpose of a Phase I i...

1979-01-01

471

National Program for Inspection of Non-Federal Dams. Stevens Paper Company (Upper) Dam (MA 00075), Hampden County, Westfield, Massachusetts.  

National Technical Information Service (NTIS)

Stevens Paper Co. (Upper) Dam consists of a stone masonry spillway 150 feet long and a maximum height of 18 feet near the right abutment. The average height of the spillway is approximately 15 feet. The abutment walls and embankments rise 8 feet above the...

1979-01-01

472

National Dam Safety Program. Gregory's Pond Dam (VA-04122), Middle James River Basin, Chesterfield County, Virginia. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Pursuant to Public Law 92-367, Phase I Inspection Reports are prepared under guidance contained in the recommended guidelines for safety inspection of dams, published by the Office of Chief of Engineers, Washington, D. C. 20314. The purpose of a Phase I i...

P. Seiler

1979-01-01

473

An Investigation on the Characteristics of the Seismic Signals Induced by Overtopping Dam Breach  

NASA Astrophysics Data System (ADS)

Deep-seated landslide masses often block rivers and form landslide dams. Most landslide dams are prone to failure by overtopping water and may induce strong surge wave in the downstream. This study discussed the characteristics of dam break surge wave by experimental methods. We established an artificial dam on a creek in Nantou, Taiwan, for the large-scale dam breach test by overtopping. Flume tests in laboratory were also setup to observe the stability and erosion process of model dams. Accelerometers were used to record the vibrational signals induced by the overtopped water. The vibration signals induced by the surge wave were successfully captured. The velocity of the surge wave front was calculated using the time-frequency spectral magnitude obtained from Hilbert-Huang Transform (HHT). The frequency contents of the seismic signals of the surge waves were also analyzed. The erosion process and erosion rate and duration were discussed. The characteristics including frequency range, duration and corresponding processes, of the vibration signals from the artificial dam and flume tests were compared to the analyzed characteristics of the actual landslide dam breach event at Xiaolin, Kaohsiung occurred in 2009 (Feng, 2012).; An artificial dam on a creek in Nantou, Taiwan, for the large-scale dam breach test by overtopping. ; Opening after the large-scale dam breach test by overtopping.

Feng, Z.; Chen, S.; Kao, S.

2012-12-01

474

Effects of Dam Impoundment on the Flood Regime of Natural Floodplain Communities in the Upper Connecticut River  

Microsoft Academic Search

Understanding the effects of dams on the inundation regime of natural floodplain communities is critical for effective decision making on dam management or dam removal. To test the implications of hydrologic alteration by dams for floodplain natural communities, we conducted a combined field and modeling study along two reaches in the Connecticut River Rapids Macrosite (CRRM), one of the last

Keith H. Nislow; Francis J. Magilligan; Heidi Fassnacht; Doug Bechtel; Ana Ruesink

2002-01-01

475

Sediment Transport and Deposition Resulting from a Dam-Removal Sediment Pulse: Milltown Dam, Clark Fork River, MT  

NASA Astrophysics Data System (ADS)

The removal of Milltown Dam in 2008 from the Clark Fork River, Montana, USA, lowered base level at the dam site by 9 m and triggered erosion of nearly 600,000 metric tons of predominantly fine reservoir sediment. Bedload and bed-material sampling, repeat topographic surveys, sediment transport modeling, geochemical fingerprinting of downstream sediments, and Lidar analysis have all been applied to study the upstream and downstream effects of the dam removal. In the years since dam breaching, successive years with similar peak flows (3-year recurrence interval) were followed by a third year with below-average runoff. Nearly all of the documented reservoir erosion occurred in the first year, when sand and silt was eroded and transported downstream. In subsequent years, minimal reservoir erosion occurred, in part as a result of active management to prevent further reservoir erosion, but coarse material eroded from the reservoir has dispersed downstream. Upstream responses in this system have been strongly mediated by Superfund remediation activities in Milltown Reservoir, in which over two million metric tons of contaminated sediments have been mechanically excavated. Downstream aggradation has been limited in the main channel but was initially substantial in bars and side channels of a multi-thread reach 21 to 25 km downstream of the dam site, suggesting that channel change has been influenced far more by the antecedent depositional environment than by proximity to the source of the sediment pulse. Comparison of observed erosion with pre-removal modeling shows that reservoir erosion exceeded model predictions by two orders of magnitude in the unconfined Clark Fork arm of the reservoir. In addition, fine reservoir sediments predicted to move exclusively in suspension traveled as bedload at lower transport stages. The resulting fine sediment deposition in substrate interstices, on bars, and in side channels of the gravel- and cobble-bed Clark Fork River is the most significant and lasting change to downstream geomorphic and ecological systems.

Wilcox, A. C.

2010-12-01

476

After Three Gorges Dam: What have we learned?  

NASA Astrophysics Data System (ADS)

China is at a critical point in its development path. By investing heavily in large-scale infrastructure, the rewards of economic growth weigh against long-term environmental and social costs. The construction of Three Gorges Dam, the world's largest hydroelectric project, began in 1994. Between 2002 and 2010, its 660 kilometer reservoir filled behind a 181 meter dam, displacing at least 1.4 million people and transforming Asia's longest river (the Yangtze) while generating nearly 100 billion kWh/yr of electricity -- 2.85% of China's current electric power usage. As the mega-project progenitor in a cascade of planned dams, the Three Gorges Dam emerges as a test case for how China will plan, execute and mitigate its development pathway and the transformation of its environment. Post-Project Assessments (PPA) provide a systematic, scientific method for improving the practice of environmental management - particularly as they apply to human intervention in river systems. In 2012, the Department of Landscape Architecture and Environmental Planning at University of California, Berkeley organized a symposium-based PPA for the Three Gorges Dam on the Yangtze River. Prior to this symposium, the twelve invited Chinese scientists, engineers and economists with recent research on Three Gorges Dam had not had the opportunity to present their evaluations together in an open, public forum. With a 50-year planning horizon, the symposium's five sessions centered on impacts on flows, geomorphology, geologic hazards, the environment and socioeconomic effects. Three Gorges' project goals focused on flood control, hydropower and improved navigation. According to expert research, major changes in sediment budget and flow regime from reservoir operation have significantly reduced sediment discharge into the downstream river and estuary, initiating a series of geomorphic changes with ecological and social impacts. While the dam reduces high flow stages from floods originating above the reservoir, subsequent floodplain development and degradation of levees increase downstream flood risk. As geomorphic adjustment continues, the loss of key fish and wildlife habitat will rise, a recognized but externalized environmental cost with potential mitigation measures found in protecting and restoring floodplain lakes. With significant underestimates of social impacts and project costs, the population of the surrounding area has experienced severe adverse impacts ranging from loss of ancient villages, landholdings, and livelihoods to increased threats of natural hazards -- without full compensation or public disclosure of project costs. The value of PPAs is most realized when integrated into adaptive management for river basin planning. Throughout the symposium, speakers echoed the conclusion: 'The entire Yangtze basin needs comprehensive management.' Integrated planning decisions must consider dams, water diversions, reservoir management, protection of natural areas, basin-wide land management, preservation of flood detention areas and levees, and both economic compensation and social opportunity for affected residents. The resulting analysis may influence the massive expansion of worldwide hydroelectric development as China exports its financing and dam building expertise.

Natali, J.; Williams, P.; Wong, R.; Kondolf, G. M.

2013-12-01

477

Simulating sediment and Cs 137 transfer and deposition in dams of Fukushima prefecture  

NASA Astrophysics Data System (ADS)

Sediment and cesium 137 discharged into dams and reservoirs and accumulated onto dam and reservoir beds in eastern Fukushima prefecture after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident are simulated by a simple and fast simulation model which we developed by utilizing the universal soil loss equation and the geographical information system. Modeling of soil erosion, transport and deposition, and cesium 137 dispersion were implemented to simulate cesium 137 transport and its future distribution based on the 100m-size grid system. Raster based calculation protocols are formulated using ModelBuider function included in ArcEditor of version 10.0. We applied this model to various dams and reservoirs of eastern Fukushima prefecture and simulated results are compared with some of the measurement data that have been achieved thus far since the FDNPP accident. In the present calculations, we assumed the amount of water into a dam or reservoir is equivalent to the amount of water out from the dam or reservoir. Any operational controls that may have taken in each dam or reservoir are ignored. Annual soil loss from each dam basin, annual soil inflow into each dam, annual soil deposition in each dam, and annual soil discharge from each dam are simulated. Concentrations of radio-cesium 137 in the deposited sediments for the Ogaki dam and Ogi dam, for examples, were calculated and compared with rough estimates of the corresponding values based on the field survey results, and reasonable agreement was observed. Also, the annual soil deposition on the Ogi dam bed is simulated and again compared with rough estimate of the corresponding value based on the field survey, and the order of magnitude was matched. Furthermore, we simulated the effect of decontamination in Ogaki dam basin as an example and it was shown that an intensive decontamination for particular land use area could effectively decrease the discharged amount of radioactive cesium.

Kitamura, Akihiro; Yamaguchi, Masaaki; Sato, Haruo; Yui, Mikazu

2014-05-01

478

Deformations of Pournari I dam (Greece) based on long-term geodetic monitoring data  

NASA Astrophysics Data System (ADS)

A big number of large earth fill dams worldwide are expected to exceed their design lifespan until 2020. This number is becoming larger when taking into account predictions that dam infrastructure is not expected to withstand future natural disasters, with severe consequences to public safety and significant economic losses. Systematic monitoring and analysis is an important tool that enables the evaluation of the on-going performance of a dam, the validation of laboratory models and the assessment of different engineering designs. Currently, relationships describing the long-term evolution of dam deformations are based on only a few studies and mainly focused on the magnitude of crest settlements and the downstream horizontal deflections of the dam. This study presents the post-construction analysis of the behaviour of one of the largest earth fill dams in Greece, based on long-term monitoring data. The 29 year long dataset consisted of geodetic measurements of vertical and horizontal deformations from the crest and the body of the dam, reservoir level fluctuations, in addition to rainfall records of the dam area. Our analysis shows that the settlement of the crest remains within normal limits while the rate of deformations was stabilised almost seven years after the completion of the dam, which is longer than the period suggested by previous studies. The impoundment of the reservoir had a significant effect on the horizontal deflections of the body of the dam: an upwards and upstream movement in part of the downstream shoulder was detected. We compare our results with those obtained from the analysis of one of the highest earth fill dams in Europe, the Kremasta dam. We suggest that this pattern, though rarely mentioned in the international literature, is neither uncommon nor abnormal (when the horizontal deflections are still within safety limits) and is related to changes in the water pressure within the dam along with the on-going consolidation of the dam clay core.

Michalis, Panagiotis; Pytharouli, Stella

2014-05-01

479

Check dams effects on sediment transport in steep slope flume  

NASA Astrophysics Data System (ADS)

Depending on many influences (geology, relief, hydrology, land use, etc.) some mountainous watershed are prone to cause casualties and facilities damages. Large amounts of sediments episodically released by torrents are often the biggest problem in torrent related hazard mitigation. Series of transversal structures as check dams and ground sills are often used in the panel of risk mitigation technics. A large literature exits on check dams and it mainly concerns engineering design, e.g. toe scouring, stability stress diagram, changes in upper and lower reaches equilibrium slopes. Check dams in steep slope rivers constitute fixed points in the bed profile and prevent general bed incision. However their influence on sediment transport once they are filled is not yet clear. Two flume test campaigns, synthetize in Table 1, were performed to investigate this question: Table 1 : experiment plan Run (duration) Ref1 (50h)CD1a (30h)CD1b (30h)Ref2 (92h)CD2 (18h) Solid feeding discharge (g.s^-1) 44 44 44 60 60 Number of check dams none 1 3 none 2 A nearly 5-m-long, 10-cm-wide and 12%-steep flume was used. The water discharge was set to 0,55 l/s in all runs. A mixture of poorly sorted natural sediments with diameters between 0.8 and 40 mm was used. An open solid-discharge-feeding circuit kept the inlet sediment flux constant during all experiments. As both feeding rates did not present variation, changes in outlet solid discharge were assumed to be due to bed variations in the bed storage. We observed strong fluctuations of solid flux and slope in each reaches of all runs between: (i) steep aggradating armoured bed and (ii) less steep and finer bed releasing bedload sheets during erosion events and inducing bedload pulses. All experiments showed consistent results: transported volume associated with erosion event decreased with the length between two subsequent check dams. Solid transversal structures shorten the upstream erosion-propagation and avoid downstream change in the bed level. As long as they are not buried by too strong aggradation they allow a 'bed level independence' between reaches. On the long term, as the total inlet flux is kept constant, a decrease in transported volumes induces an increase in the erosion event frequency: sediment releases are more frequent but littler. As proposed by Poncet (1995), check dams participate efficiently in hazard mitigation because 'they release in retail what torrents would too abruptly delivered wholesale'. Reference : Poncet, A. "Restauration et conservation des terrains en montagne." Office national des forêts, Paris (1995).

Piton, Guillaume; Recking, Alain

2014-05-01

480

Evidence against small dam removal as an ecological disturbance: Benthic macroinvertebrate and channel responses to dam removals in Oregon, USA  

NASA Astrophysics Data System (ADS)

A dominant concern for environmental managers is often the biological consequences of the physical disturbance generated by sediment pulses, such as those associated with dam removal or sediment flushing from existing dams. However, limited field data exists against which concerns regarding planned removals can be evaluated. This study documents an investigation of biophysical interactions related to sediment pulses from dam removals, with emphasis on a) the spatial extent and magnitude of disturbance to channel habitat and benthic macroinvertebrate community, and b) the rate and spatial patterns of channel and invertebrate community recovery over time. We analyzed field observations, collected in an upstream-downstream BACI study design, from three dam removals of varying size and channel substrate: Brownsville Dam, Calapooia River (height = 2.5 m, D50 = 59 m), Chiloquin Dam, Sprague River (height = 3.4 m, D50 = 0.15 mm), and Savage Rapids Dam, Rogue River (height = 12 m, D50 = 8 m). At each site, we investigated how elements of the physical channel related to disturbance (grain size and variability, bed stability, bed complexity) and benthic macroinvertebrate community (species richness, functional traits) changed over space and time. We projected that hypothesized changes in the physical channel (reduction in bed complexity, site-specific changes in bed mobility, site-specific grain size changes) following the sediment pulse would lead to reduction in species richness and a transition to functional traits (short lived, rapid reproduction, tolerant of mobile beds) affiliated with sediment disturbance. However, results indicate that our hypothesized channel changes were not consistently validated across the sites. Further, we found little evidence of substantial impact of the sediment pulse on the invertebrate communities, though some variability in functional traits may be attributable to dam removal at Savage Rapids. More specifically, we found that: a) Channel responses varied across sites, associated with the size of material stored in the reservoir and hydrologic year. Initial reduction in bed complexity was the only consistent change observed across the sites; b) Across the three sites, there was no strong indication that species richness or functional traits responded to the observed channel changes as a disturbance. However, a small disturbance-related effect may be interpreted at the Savage Rapids dam removal by some of the functional trait changes (e.g. shifts of life span from long to short-lived taxa and towards multi-voltinism) following removal; and c) Variability in invertebrate community was more clearly driven by variability in annual hydrology, suggesting that the sediment pulses at these sites were less significant as a disturbance than the annual flows. We conclude with discussions on data limitations and on evaluating when sediment pulses are likely to generate a significant disturbance to aquatic communities.

Tullos, D. D.

2012-12-01

481

Geochemical modeling of cyanide in tailing dam gold processing plant  

NASA Astrophysics Data System (ADS)

This research is aimed at investigating possible neutralization of cyanide in tailing dam of Muteh gold processing plant in Isfahan, Iran at various conditions such as pH and temperature using USEPA Visual MINTEQ geochemical model simulation. The model is based on geochemical equilibrium which uses the simultaneous solution of the non-linear mass action expressions and linear mass balance relationships to formulate and solve the multiple-component chemical equilibrium problems. In this study the concentration of aqueous species in tailing dam as an aqueous, solid and gaseous were used as input in the model. Temperature and pH variation were simulated. The results of the model indicated that cyanide may be complexes in 10 < pH < 5. In other pH values complexation is not important. The results also indicated that cyanide reduction mechanism in acidic pH and temperature above 30°C is due to cyanide acid formation which is vaporized.

Khodadadi, Ahmad; Monjezi, M.; Mehrpouya, H.; Dehghani, H.

2009-09-01

482

Turbocharger with sliding piston, and having vanes and leakage dams  

DOEpatents

A turbocharger having a sliding piston for regulating exhaust gas flow into the turbine wheel includes a set of first vanes mounted on a fixed first wall of the turbine nozzle and projecting axially toward an opposite second wall of the nozzle, and/or a set of second vanes mounted on the end of the piston and projecting in an opposite axial direction toward the first wall of the nozzle. For the/each set of vanes, there are leakage dams formed on the wall that is adjacent the vane tips when the piston is closed. The leakage dams are closely adjacent the vane tips and discourage exhaust gas from leaking in a generally radial direction past the vane tips as the piston just begins to open from its fully closed position.

Roberts, Quentin (Nancy, FR); Alnega, Ahmed (Thaon Les Vosges, FR)

2011-12-06

483

Are 6-month-old foals sensitive to dam's influence?  

PubMed

A recent study has shown that gently handling dams in front of their few days old foals may strongly influence the development of human-foal relationships. In the present study, we test whether 6-month-old foals remain sensitive to their dams' influence. The study was performed on 16 foal-mare dyads, with half of the mares receiving positive contacts from the experimenter in presence of their 6-month-old foals (n = 8) whereas the other mares were not handled (n = 8). All foals were tested 15 and 30-35 days later under various conditions (reaction to a motionless human, approach test, saddle-pad tolerance test). We observe a positive effect of mare' handling on foals' reactions to humans but with a high interindividual variability, suggesting a higher effect of the foals' own behavioral characteristics at this age than at earlier stages. PMID:17577237

Henry, S; Briefer, S; Richard-Yris, M-A; Hausberger, M

2007-07-01

484

Ethiopia's Grand Renaissance Dam: Implications for Downstream Riparian Countries  

NASA Astrophysics Data System (ADS)

Ethiopia has begun seriously developing their significant hydropower potential by launching construction of the Grand Ethiopian Renaissance Dam (GERD) on the Blue Nile River to facilitate local and regional growth. Although this has required substantial planning on Ethiopia's part, no policy dictating the reservoir filling rate strategy has been publicly issued. This filling stage will have clear implications on downstream flows in Sudan and Egypt, complicated by evaporative losses, climate variability, and climate change. In this study, various filling policies and future climate states are simultaneously explored to infer potential streamflow reductions at Lake Nasser, providing regional decision-makers with a set of plausible, justifiable, and comparable outcomes. Schematic of the model framework Box plots of 2017-2032 percent change in annual average streamflow at Lake Nasser for each filling policy constructed from the 100 time-series and weighted precipitation changes. All values are relative to the no dam policy and no changes to future precipitation.

Zhang, Y.; Block, P. J.; Hammond, M.; King, A.

2013-12-01

485

Environmental effects of the high dam at Aswan  

SciTech Connect

No single resource development project has aroused more controversy than the high dam that stores the flow of the Nile River above the first cataract at Aswan. It is praised as the mainstay of the Egyptian economy and vilified as an environmental catastrophe. Twenty-one years after its completion there has been sufficient time to permit a first approximation of what is known about the dam's environmental effects and how they compare to what was anticipated when engineers and politicians decided to undertake the massive project. Although the evidence from post-audit study over the past decade is far from complete, there is enough to warrant general observations on direct economic impacts and to suggest several possible lessons of importance to scientists engaged in predicting and tracing environmental linkages from major water projects.

White, G.F.

1988-09-01

486

Development of Dam Operation Scheme in a Hydrology Model  

NASA Astrophysics Data System (ADS)

A novel scheme for dam operation has been developed based on the artificial neural network approach to predict the reservoir management and hydrologic effects in response to climate variation and change. The scheme is built upon the historic management information of operating each dam, including climate, ecology properties and attributes (e.g., storage, surface area) for all relevant reservoirs. The scheme implicitly introduces the relationship between water demand and supply for downstream fluvial ecosystem, agriculture irrigation, and hydropower. This study will first present the fundamental formulation of the predictive scheme along with detailed analysis of the historical management data, and then evaluate the performance for its application in the Colorado River basin. Caveats and merits will also be discussed.

He, Y.; Liang, X.

2013-12-01

487

Teton Dam flood of June 1976, Menan Buttes quadrangle, Idaho  

USGS Publications Warehouse

The failure of the Teton Dam caused extreme flooding along the Teton River, Henrys Fork, and Snake River in southeastern Idaho on June 5-8, 1976. No flooding occurred downstream from American Falls Reservoir. The inundated areas and maximum water-surface elevations are shown in a series of 17 hydrologic atlases. The area covered by the atlases extends from Teton Dam downstream to American Falls Reservoir, a distance of 100 miles. The extent of flooding shown on the maps was obtained by field inspections and aerial photographs made during and immediately after the flood. There may be small isolated areas within the boundaries shown that were not flooded, but the identification of these sites was beyond the scope of the study. The elevation data shown are mean-sea-level elevations of high-water marks identified in the field. This particular map (in the 17-map series) shows conditions in the Menan Buttes quadrangle. (Woodard-USGS)

Thomas, Cecil A.; Ray, Herman A.; Harenberg, William A.

1976-01-01

488

Numerical modeling of fish passage at the Lower Granite dam  

NASA Astrophysics Data System (ADS)

Being the first collector dam on the Snake River, the Lower Granite Dam is important to juvenile fish downstream passage. To improve the performance of the Behavioral-Guidance-Structure(BGS), Surface-Bypass-Collector(SBC), and Removable-Spillway-Weir (RSW) on fish passage, numerical simulations have been conducted using the 3D CFD model developed at IIHR-Hydroscience & Engineering. The code solves the RANS equations with two-equation turbulence models. Multi-block structured grids were generated. The model was first compared in the total force and distribution on the BGS wall with the prototype data and the comparison gave a satisfactory agreement. Then runs with combinations of the BGS, SBC, RSW, trash boom, and loading of the units and spillway were conducted, and the primary flow patterns, pressure distribution on the BGS wall, velocity, and acceleration status of flow approaching the RSW were analyzed and compared.

Weber, Larry; Li, Songheng; Hansen, Ken

2005-11-01

489

National Dam Inspection Program. Upper Mt. Holly Dam (NDI Number PA-00583, DER Number 21-001), Susquehanna River Basin, Cumberland County, Pennsylvania. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The Dam's location is Borough of Mt. Holly Springs, Cumberland County U.S.G.S. Quadrangle - Mt. Holly Springs, Pa. The general appearance of Upper Mt. Holly Dam is poor. The earth embankment is overgrown with brush and trees and the slopes are uneven. The...

H. Jongsma

1981-01-01

490

National Program for Inspection of Non-Federal Dams. Prym Manufacturing Co. Dam (CT 00169), Thames River Basin, Killingly, Connecticut. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Prym Manufacturing Co. Dam consists of nine earthfill dikes totaling about 2,000 ft. in length and of heights up to about 14 ft. These dikes form a continuous millrace canal between a diversion dam across Fivemile River and a mill building on the west ban...

1979-01-01

491

National Dam Safety Program. Gettemeier Lake Dam No Name 447 (MO 10796), Missouri - Kansas City Basin, St. Charles County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

No-Name 447 dam was inspected by an interdisciplinary eam of engineers. The purpose of the inspection was to make an assessment of the general condition of the dam with respect to safety, based upon available data and visual inspection, in order to determ...

H. M. Reitz J. J. Bailey

1978-01-01

492

National Program for Inspection of Non-Federal Dams. Bigney Pond Dam (MA 00422), Massachusetts-Rhode Island Coastal Basin, Brockton, Massachusetts. Phase I, Inspection Report.  

National Technical Information Service (NTIS)

Bigney Pond Dam is formed by an approximately 180 ft. length of earth embankment confined by vertical atone masonry retaining walls about 11 ft. high. The dam is in good condition. It has a low hazard potential and is small in size. The city of Brockton s...

1978-01-01

493

Insecticides, polychlorinated biphenyls and metals in African lake ecosystems. I. Hartbeespoort Dam, Transvaal and Voëlvlei Dam, Cape Province, Republic of South Africa  

Microsoft Academic Search

Concentrations and distribution of chlorinated hydrocarbon insecticides, polychlorinated biphenyls (PCB's) and some metals were determined in two South African lakes, Hartbeespoort Dam and Voëlvlei Dam. Water, bottom sediments, aquatic plants, aquatic insects, fish, fish-eating birds and their eggs were collected.

Yvonne A. Greichus; Algirdas Greichus; Barbara D. Amman; Daniel J. Call; Dassiën C. D. Hamman; Richard M. Pott

1977-01-01

494

National Program for Inspection of Non-Federal Dams. Ashford Lake Dam (CT 00462), Thames River Basin, Ashford, Connecticut. Phase I Inspection.  

National Technical Information Service (NTIS)

The dam, built in 1949, consists of an earth embankment with a spillway at the right end and a low-level outlet at the central portion. The dam has a maximum impoundment capacity of 715 acre-feet and is approximately 450 feet long, 20 feet wide at the top...

1980-01-01

495

National Program for Inspection of Non-Federal Dams. Reuben Hart Reservoir Dam (CT 00096), Naugatuck River Basin, Torrington, Connecticut. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Reuben Hart Reservoir Dam is an earth embankment about 1,000 ft. long, 15 ft. wide at the crest, with a maximum height of about 50 ft. The dam is operated by Torrington Water Company as a water supply facility for the city of Torrington. Built in 1933, th...

1978-01-01

496

National Program for Inspection of Non-Federal Dams. Mono Pond Dam (CT 00258), Thames River Basin, Columbia, Connecticut. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam consists of a concrete principal spillway, embankments to the right and left of this spillway and an emergency spillway near the right end of the dam. The principal spillway is a concrete chute with weir-boards at the upstream end and the emergenc...

1980-01-01

497

Impact of dam-building on marine life  

Microsoft Academic Search

Dam-building across naturally flowing rivers tends to decrease discharge of surplus water into the sea, reduce nutrient concentration\\u000a in estuaries and coastal waters, and diminish plankton blooms as well as fish landings. Depletion of nutrients and organic\\u000a matter along with reduced mud and silt deposition affect benthic life on the continental shelf. Reduced mud and silt deposition\\u000a leads to coastal

T. J. Pandian

1980-01-01

498

Panoramic view from bluff south of Grand Coulee Dam; this ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Panoramic view from bluff south of Grand Coulee Dam; this segment of the panorama shows the western end of Crescent Bay Lake (in the foreground), the western limits of the town of Grand Coulee, part of Grand Coulee's transformer yard (center in the distance), and the concrete-lined feeder canal that extends to Banks Lake, looking northwest. - Columbia Basin Project, Grand Coulee, Grant County, WA

499

Transporting juvenile salmonids around dams impairs adult migration.  

PubMed

Mitigation and ecosystem-restoration efforts may have unintended consequences on both target and nontarget populations. Important effects can be displaced in space and time, making them difficult to detect without monitoring at appropriate scales. Here, we examined the effects of a mitigation program for juvenile salmonids on subsequent adult migration behaviors and survival. Juvenile chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) were collected and uniquely tagged with passive integrated transponder (PIT) tags at Lower Granite Dam (Washington State, USA) on the Snake River and were then either transported downstream in barges in an effort to reduce out-migration mortality or returned to the river as a control group. Returning adults were collected and radio-tagged at Bonneville Dam (Washington-Oregon, USA) on the Columbia River 1-3 years later and then monitored during approximately 460 km of their homing migrations. The proportion of adults successfully homing was significantly lower, and unaccounted loss and permanent straying into non-natal rivers was higher, for barged fish of both species. On average, barged fish homed to Lower Granite Dam at rates about 10% lower than for in-river migrants. Barged fish were also 1.7-3.4 times more likely than in-river fish to fall back downstream past dams as adults, a behavior strongly associated with lower survival. These results suggest that juvenile transport impaired adult orientation or homing abilities, perhaps by disrupting sequential imprinting processes during juvenile out-migration. While juvenile transportation has clear short-term juvenile-survival benefits, the delayed effects that manifest in adult stages illustrate the need to assess mitigation success throughout the life cycle of target organisms, i.e., the use of fitness-based measures. In the case of Snake River salmonids listed under the Endangered Species Act, the increased straying and potential associated genetic and demographic effects may represent significant risks to successful recovery for both target and nontarget populations. PMID:19263886

Keefer, Matthew L; Caudill, Christopher C; Peery, Christopher A; Lee, Steven R

2008-12-01

500

Rock Island Dam Smolt Monitoring; 1994-1995 Annual Report.  

SciTech Connect

Downstream migrating salmon and steelhead trout (Oncorhynchus spp.) smolts were monitored at the Rock Island Dam bypass trap from April 1 - August 31, 1954. This was the tenth consecutive year that the bypass trap was monitored. Data collected included: (1) number of fish caught by species, (2) number of adipose clipped and/or Passive Integrated Transponder (PIT) tagged fish caught by species, (3) daily average riverflow, (4) daily average powerhouse No. 1 and No. 2 flows and daily average spill. These data were transmitted to the Fish Passage Center, which manages the Smolt Monitoring Program throughout the Columbia River Basin. The Smolt Monitoring Program is used to manage the {open_quotes}water budget{close_quotes}, releasing upstream reservoir water storage allocated to supplement river flows to enhance survival of downstream migrating juvenile salmonids. The Rock Island Dam trapping facility collected 37,795 downstream migrating salmonids in 1994. Collected fish included 4 yearling and 4 sub-yearling chinook salmon (O. tshawytscha) that had been previously PIT tagged to help determine migration rates. Additionally, 1,132 sub-yearling chinook, 4,185 yearling chinook, 6,627 steelhead, (O. mykiss) and 422 sockeye (O. nerka) with clipped adipose fins were collected. The middle 80% of the 1994 spring migration (excluding sub-yearling chinooks) passed Rock Island Dam during a 34 day period, April 25 - May 28. Passage rates of chinook and steelhead smolts released from hatcheries and the downstream migration timing of all salmonids are presented. The spring migration timing of juvenile salmonids is strongly influenced by hatchery releases above Rock Island Dam.

Truscott, Keith B.; Fielder, Paul C. (Chelan County Public Utility District No. 1, Power Operations Department, Wenatchee, WA)

1995-10-01