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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

Coming: 12,600 megawatts at Itaipu Island  

SciTech Connect

This paper describes the hydroelectric plant being constructed jointly by Brazil and Paraguay on Itaipu Island in the Parana River. The planned generating capacity of 12,600 MW will make the Itaipu plant the world's largest. It will employ the most powerful hydrogenerators and turbines yet built, the world's largest concentration of 500-kilovolt gas-insulated switchgear, the highest dc transmission voltages and power--600 kV and 6300 MW--ever used, about 1000 kilometers of 765-kV ac transmission, and an extensive computer-based digital supervisory system in which continuous diagnostic evaluation of equipment is emphasized. To maintain national standards, nine generators will operate at 60 hertz for Brazil and nine at 50 hertz for Paraguay. Initially, any excess electricity available from the Paraguay generators will be routed to Brazil, but Paraguay is ultimately expected to share in half the Itaipu generation. The paper discusses the plant from its original feasibility studies to the newly created technologies which its size necessitated. The environmental impact on forests, farmlands and wildlife resulting from the construction of the Itaipu dam and the loss of the 1400 square kilometers which it flooded--including the popular Seven Waterfalls--is addressed. References to other papers as well as a symposium on the Itaipu project are cited.

de Moraes, J.

1983-08-01

4

Fractionation and potential toxic risk of metals from superficial sediment in Itaipu Lake--boundary between Brazil and Paraguay.  

PubMed

The objective of this study was to evaluate fractions of metals (labile and pseudo-total) extracted from sediment samples collected in Itaipu Lake (boundary between Brazil and Paraguay) and to assess the dynamics and mobility of these fractions by identifying the same bioavailability and ecological risk to metals in the aquatic environment. The concentrations of metal ions were determined by flame atomic absorption spectrometry. There was a correlation between the metal ions, both in the labile and the pseudo-total, with regard to particle size. To assess metals concentrations in sediment, numerical sediment-quality guidelines were applied. The concentrations of aluminum, cadmium, iron, manganese, lead, and zinc in all sediment samples are lower than the proposed probable effects level (PEL), thus possibly indicating that there are no harmful effects from these metals. In contrast, concentrations of copper, chromium, and nickel exceeded the PEL in some samples, thus indicating that these stations are at potential risk. The level of contamination in sediments of Itaipu Lake for all metals was evaluated using contamination factor, degree of contamination, and sum-of-metals toxic unit. PMID:23014936

Kalwa, Miguel; Quináia, Sueli Pércio; Pletsch, Adelmo L; Techy, Laura; Felsner, Maria Lurdes

2013-01-01

5

Aquatic macrophytes in the large, sub-tropical Itaipu Reservoir, Brazil.  

PubMed

In the last three decades, rapid assessment surveys have become an important approach for measuring aquatic ecosystem biodiversity. These methods can be used to detect anthropogenic impacts and recognize local or global species extinctions. We present a floristic survey of the aquatic macrophytes along the Brazilian margin of the Itaipu Reservoir conducted in 2008 and compare this with a floristic survey conducted ten years earlier. We used ordination analysis to determine whether assemblage composition differed among reservoir arms. Macrophyte species were sampled in each of the 235 sampling stations using a boat, which was positioned inside three places of each macrophyte stand to record species and search for small plants. We also collected submerged plants using a rake with the boat moving at constant velocity for ten minutes. We assigned individual macrophyte species to life form and identified representative species for each life form. A total of 87 macrophyte taxa were identified. The "emergent" life forms contained the highest number of species, followed by "rooted submerged" life forms. The extensive survey of macrophytes undertaken in September 2008 recorded more species than a survey conducted between 1995 and 1998. This could be due to changes in water physico-chemistry, disturbances due to water drawdown and the long period between surveys, which may have allowed natural colonization by other species. Additionally, differences in the classification systems and taxonomic resolution used in the surveys may account for differences in the number of species recorded. Assemblage composition varied among the arms and was affected by underwater radiation (as measured using a Secchi disk) and fetch. Five non-native species were found. Two of these non-native species (Urochloa subquadripara and Hydrilla verticillata) are of special concern because they have a high frequency of occurrence and occupy large marginal areas of the reservoir. Future surveys should be conducted to determine the habitat most frequently colonized by these species. This would allow management strategies to be developed to protect native aquatic biota and prevent interference with the recreational and commercial uses of the Itaipu Reservoir. PMID:21246998

Mormul, Roger Paulo; Ferreira, Fernando Alves; Michelan, Thaisa Sala; Carvalho, Priscilla; Silveira, Marcio José; Thomaz, Sidinei Magela

2010-12-01

6

Social Impacts of Brazil's Tucuruí Dam.  

PubMed

/ The Tucuruí Dam, which blocked the Tocantins River in 1984 in Brazil's eastern Amazonian state of Pará, 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 Tucuruí reveals a systematic overestimation of benefits and underestimation of impacts as presented by authorities. Tucuruí offers many as-yet unlearned lessons for hydroelectric development in Amazonia.KEY WORDS: Tucuruí Dam; Amazonia; Hydroelectric dams; Brazil; Reservoirs; Mercuryhttp://link.springer-ny.com/link/service/journals/00267/bibs/24n4p483.html

Fearnside

1999-11-01

7

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

8

Dams in the Amazon: Belo Monte and Brazil's Hydroelectric Development of the Xingu River Basin  

Microsoft Academic Search

Hydroelectric dams represent major investments and major sources of environmental and social impacts. Powerful forces surround the decision-making process on public investments in the various options for the generation and conservation of electricity. Brazil's proposed Belo Monte Dam (formerly Kararaô) and its upstream counterpart, the Altamira Dam (better known by its former name of Babaquara) are at the center of

Phillip M. Fearnside

2006-01-01

9

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

10

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

11

Dams in the Amazon: Belo Monte and Brazil's Hydroelectric Development of the Xingu River Basin  

NASA Astrophysics Data System (ADS)

Hydroelectric dams represent major investments and major sources of environmental and social impacts. Powerful forces surround the decision-making process on public investments in the various options for the generation and conservation of electricity. Brazil’s proposed Belo Monte Dam (formerly Kararaô) and its upstream counterpart, the Altamira Dam (better known by its former name of Babaquara) are at the center of controversies on the decision-making process for major infrastructure projects in Amazonia. The Belo Monte Dam by itself would have a small reservoir area (440 km2) and large installed capacity (11, 181.3 MW), but the Altamira/Babaquara Dam that would regulate the flow of the Xingu River (thereby increasing power generation at Belo Monte) would flood a vast area (6140 km2). The great impact of dams provides a powerful reason for Brazil to reassess its current policies that allocate large amounts of energy in the country’s national grid to subsidized aluminum smelting for export. The case of Belo Monte and the five additional dams planned upstream (including the Altamira/Babaquara Dam) indicate the need for Brazil to reform its environmental assessment and licensing system to include the impacts of multiple interdependent projects.

Fearnside, Phillip M.

2006-07-01

12

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

13

The Cotingo Dam as a Test of Brazil's System for Evaluating Proposed Developments in Amazonia  

PubMed

The proposed Cotingo Dam in Brazil's far northern state of Roraima is examined with the objective of drawing lessons for Brazil's system of evaluating environmental, social, and financial consequences of development decisions. The Cotingo Dam illustrates the difficulty of translating into practice the principles of economic and environmental assessment. Examination of the financial arguments for the Cotingo Dam indicates that justifications in this sphere are insufficient to explain why the project is favored over other alternatives and points to political factors as the best explanation of the project's high priority. Strong pressure from political and entrepreneurial interest groups almost invariably dominates decision making in Amazonia. The analysis indicates the inherent tendency of the present system to produce decisions in favor of large construction projects at the expense of the environment and local peoples. The requirements intended to assure proper weight for these concerns, such as the report on environmental impacts (RIMA) and the public hearing, fail to serve this role. Cotingo also provides a test case for constitutional protections restricting construction of dams in indigenous lands.KEY WORDS: Hydroelectric dams; Amazonia; Indigenous peoples; Brazil; Roraima PMID:8703102

Fearnside; Barbosa

1996-09-01

14

FROM LOCAL TO GLOBAL: THE ANTI-DAM MOVEMENT IN SOUTHERN BRAZIL, 1979-19921  

Microsoft Academic Search

A case study of the movement of people affected by dams in southern Brazil shows how particular local mobilizations are linked to national and global economics, politics, and social movements. In the early stages, the progressive church was the predominant influence and was largely responsible for framing the key issue as peasants' right to land, while left intellectuals contributed a

FRANKLIN DANIEL ROTHMAN

15

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

16

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

17

The Cotingo Dam as a test of Brazil's system for evaluating proposed developments in Amazonia  

NASA Astrophysics Data System (ADS)

The proposed Cotingo Dam in Brazil's far northern state of Roraima is examined with the objective of drawing lessons for Brazil's system of evaluating environmental, social, and financial consequences of development decisions. The Cotingo Dam illustrates the difficulty of translating into practice the principles of economic and environmental assessment. Examination of the financial arguments for the Cotingo Dam indicates that justifications in this sphere are insufficient to explain why the project is favored over other alternatives and points to political factors as the best explanation of the project's high priority. Strong pressure from political and entrepreneurial interest groups almost invariably dominates decision making in Amazonia. The analysis indicates the inherent tendency of the present system to produce decisions in favor of large construction projects at the expense of the environment and local peoples. The requirements intended to assure proper weight for these concerns, such as the report on environmental impacts (RIMA) and the public hearing, fail to serve this role. Cotingo also provides a test case for constitutional protections restricting construction of dams in indigenous lands.

Fearnside, Philip M.; Barbosa, Reinaldo Imbrozio

1996-09-01

18

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

NASA Astrophysics Data System (ADS)

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 1500 islands and innumerable stagnant bays where the water's residence time will be even longer than the average time of over one year. Balbina was built to supply electricity to Manaus, a city that has grown so much while the dam was under construction that other alternatives are already needed. Government subsidies explain the explosive growth, including Brazil's unified tariff for electricity. Alternative power sources for Manaus include transmission from more distant dams or from recently discovered oil and natural gas deposits. Among Balbina's impacts are loss of potential use of the forest and displacement of about one third of the surviving members of a much-persecuted Amerindian tribe: the Waimiri-Atroari. The dam was closed on 1 October 1987 and the first of five generators began operation in February 1989. The example of Balbina points to important ways that the decision-making process could be improved in Brazil and in the international funding agencies that have directly and indirectly contributed to the project. Environmental impact analyses must be completed prior to decisions on overall project implementation and must be free of influence from project proponents. The current environmental impact assessment system in Brazil, as in many other countries, has an undesirable influence on science policy, in addition to failing to address the underlying causes of environmentally destructive development processes and inability to halt “irreversible” projects like Balbina.

Fearnside, Philip M.

1989-07-01

19

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

20

Environmental impacts of Brazil's Tucuruí Dam: unlearned lessons for hydroelectric development in Amazonia.  

PubMed

Brazil's Tucuruí Dam provides valuable lessons for improving decision-making on major public works in Amazonia and elsewhere. Together with social impacts, which were reviewed in a companion paper, the project's environmental costs are substantial. Monetary costs include costs of construction and maintenance and opportunity costs of natural resources (such as timber) and of the money invested by the Brazilian government. Environmental costs include forest loss, leading to both loss of natural ecosystems and to greenhouse gas emissions. Aquatic ecosystems are heavily affected by the blockage of fish migration and by creation of anoxic environments. Decay of vegetation left in the reservoir creates anoxic water that can corrode turbines, as well as producing methane and providing conditions for methylation of mercury. Defoliants were considered for removing forest in the submergence area but plans were aborted amid a public controversy. Another controversy surrounded impacts of defoliants used to prevent regrowth along the transmission line. Mitigation measures included archaeological and faunal salvage and creation of a "gene bank" on an island in the reservoir. Decision-making in the case of Tucuruí was virtually uninfluenced by environmental studies, which were done concurrently with construction. The dam predates Brazil's 1986 requirement of an Environmental Impact Assessment. Despite limitations, research results provide valuable information for future dams. Extensive public-relations use of the research effort and of mitigation measures such as faunal salvage were evident. Decision-making was closely linked to the influence of construction firms, the military, and foreign financial interests in both the construction project and the use of the resulting electrical power (most of which is used for aluminum smelting). Social and environmental costs received virtually no consideration when decisions were made, an outcome facilitated by a curtain of secrecy surrounding many aspects of the project. Despite improvements in Brazil's system of environmental impact assessment since the Tucuruí reservoir was filled in 1984, many essential features of the decision-making system remain unchanged. PMID:11148764

Fearnside, P M

2001-03-01

21

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

22

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

23

Political Benefits as Barriers to Assessment of Environmental Costs in Brazil's Amazonian Development Planning: The Example of the Jatapu Dam in Roraima  

PubMed

Development projects are rapidly changing the landscape in Brazilian Amazonia. Environmental impact assessments have been required since 1986, and the regulatory system is evolving as precedents are set by each new development project. The Jatapu Dam in Roraima provides an illustration of underlying impediments to assessment of environmental costs and to due consideration being given to these assessments when decisions are made. The high priority placed on the dam by the Roraima state government is unexplainable in terms of economic returns. The place of the dam in a long-term political strategy provides the best of several possible explanations, any one of which is incompatible with a "rational" weighing of economic and environmental costs and benefits. A number of lessons can be drawn from the experience of Jatapu, but some of the problems have no solution. The barriers to rational decision making illustrated by Jatapu apply to development projects in many parts of the world.KEY WORDS: Jatapu Dam; Amazonia; Dams; Hydroelectric development; Brazil; Tropical forest; Environmental impact assessment PMID:8703101

Fearnside; Barbosa

1996-09-01

24

[Occurrence of snail vectors of schistosomiasis in a dam of the semi-arid region of Pernambuco State, Brazil].  

PubMed

The semi-arid region of Pernambuco state is not an endemic or focal area for schistosomiasis. The present work registers the occurrence of Biomphalaria straminea in a local dam with favorable chemical-physical characteristics to the proliferation of these mollusks. This observation gets the attention for the possibility of the introduction of the disease in this semi-arid region due to the growing multiplication of these dams. PMID:10936957

Gazin, P; Barbosa, C S; Bouvy, M; Audry, P

2000-01-01

25

Reservoir stratification affects methylmercury levels in river water, plankton, and fish downstream from Balbina hydroelectric dam, Amazonas, Brazil.  

PubMed

The river downstream from a dam can be more contaminated by mercury than the reservoir itself. However, it is not clear how far the contamination occurs downstream. We investigated the seasonal variation of methylmercury levels in the Balbina reservoir and how they correlated with the levels encountered downstream from the dam. Water, plankton, and fishes were collected upstream and at sites between 0.5 and 250 km downstream from the dam during four expeditions in 2011 and 2012. Variations in thermal stratification of the reservoir influenced the methylmercury levels in the reservoir and in the river downstream. Uniform depth distributions of methylmercury and oxygen encountered in the poorly stratified reservoir during the rainy season collections coincided with uniformly low methylmercury levels along the river downstream from the dam. During dry season collections, the reservoir was strongly stratified, and anoxic hypolimnion water with high methylmercury levels was exported downstream. Methylmercury levels declined gradually to 200 km downstream. In general, the methylmercury levels in plankton and fishes downstream from the dam were higher than those upstream. Higher methylmercury levels observed 200-250 km downstream from the dam during flooding season campaigns may reflect the greater inflow from tributaries and flooding of natural wetlands that occurred at this time. PMID:24397364

Kasper, Daniele; Forsberg, Bruce R; Amaral, João H F; Leitão, Rafael P; Py-Daniel, Sarah S; Bastos, Wanderley R; Malm, Olaf

2014-01-21

26

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

27

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

28

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

29

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

30

Simulium (Chirostilbia) brunnescens (Diptera: Simuliidae) - new species from the Brazilian cerrado, Manso Dam, state of Mato Grosso, Brazil.  

PubMed

A new species of Simuliidae, Simulium (Chirostilbia) brunnescens, was discovered at Chapada dos Guimarães, state of Mato Grosso, Brazil, and nearby municipalities (Paranatinga, Rosário do Oeste and Nobres). This species is described here based on the adults, pupae and larvae. This species is closely related to Simulium (C.) subpallidum Lutz, but could be differentiated in all stages: females, leg colour pattern and frontal dilatation size; males, gonostyle shape; pupae, number of gill filaments; larvae, body size and colour, postgenal cleft, ratio between antenna and stalk of labral fan. PMID:22850948

Maia-Herzog, Marilza; Valente, Ana Carolina Dos Santos; Luna-Dias, Antonio Paulino A; Gil-Azevedo, Leonardo Henrique; Marchon-Silva, Verônica

2012-08-01

31

Tucurui dam.and the populations of the prawn Macrobrachium amazonicum in the Lower Tocantins (Pa-Brazil): a four year study  

Microsoft Academic Search

A four year survey of the prawn Manobrachimi atnazonicum (HELLER, 1862) on the Tocantins river studies che shon term impact of the Tucurui hydroelectric project on downstream fishery and reservoir populations. The furthest downstream site below the dam has been the most affected. Before the closure of the dam, the annual prawn catch in Camera and the flood intensity were

OLGA ODINETZ COLLART

32

Undamning dams  

SciTech Connect

On October 18, 1997, Vice President Gore introduced a major new initiative, the Clean Water Action Plan, commemorating the 25th anniversary of the Clean Water Act. The action plan was designed to fulfill the promise of the Clean Water Act that all US waterways would one day be fishable and swimmable. The success of the Clean Water Act in cleaning up pollution from industrial, commercial, and municipal discharges is undisputed, but the promise of fishable, swimmable waters remains unfulfilled. Nutrients, bacteria, sediment, and toxic chemicals continue to pollute the nation`s waterways from diffuse sources such as animal feedlots, storm-water runoff, agricultural drainage, and soil erosion. It is these latter sources of pollution that the Clean Water Action Plan is expected to remedy. Throughout the history of dam building, water quality has been virtually ignored. In fact, the present impact of dams on water quality is often overlooked. On the positive side, dams and their reservoirs tend to serve as settling basins. These positive benefits, however, can be offset by the negative effects dam operations have on water quality.

Crossman, J.S.

1998-12-31

33

Cracking Dams  

NSDL National Science Digital Library

This interactive activity aids students in understanding structures (particularly dams), fracture mechanics, engineering, hydraulics and geotechnology. This site emphasizes analytical thinking, iterative design, multiple solutions and teamwork. Learning in this activity is mostly collaborative, particularly in the WebQuests, which complement the simulations and activities. There are also hands-on sections and case-based reasoning. There are many references and links provided for more information.

2007-06-15

34

The impact of a dam on the helminth fauna and health of a neotropical fish species Salminus brasiliensis (Cuvier 1816) from the upper Paraná River, Brazil.  

PubMed

The aim of the present study was to detect changes in the structure of the helminth parasite infracommunities in Salminus brasiliensis (Cuvier 1816) from the floodplain of the upper Paraná River after construction of the Porto Primavera Hydroelectric Plant. A total of 126 fish in the period before the dam's construction and 56 specimens 10 years after this event were analysed. Three species of parasites were collected before the construction of the dam: Prosthenhystera obesa Diesing, 1850 (Digenea), Cladocystis intestinalis Vaz, 1932 (Digenea) and Monticellia coryphicephala Monticelli, 1892 (Cestoda), and one nematode species in the larval stage, whose identification was not possible. After dam construction, the following helminth parasites were found: C. intestinalis, M. coryphicephala, Octospiniferoides incognita, Contracaecum spp. larvae and Contracaecum sp. type 2 larvae Moravec, Kohn & Fernandes 1993. The diversity of helminth parasites measured by the Brillouin diversity index (HB) differed significantly between the pre- and post-dam periods (mean HB = 0.069 and HB = 0.2, respectively; P= 0.0479; Mann-Whitney U test). The parasite community of S. brasiliensis before the construction of the dam showed concentration of dominance (C) of P. obesa (C = 0.38), while there was no concentration of dominance of any species of parasite (C = 0.22) after the dam's construction. Before the Porto Primavera dam the relative condition factor of fish was 1.0; after the dam's construction it was 0.93 (P < 0.0001; Mann-Whitney U test). This study records the disappearance of the species P. obesa and suggests that there has been local extinction of this parasite. The results show that the anthropic influence on natural systems is interfering with the welfare and health of S. brasiliensis, reflected by its fauna of helminth parasites. PMID:22776324

Karling, L C; Isaac, A; Affonso, I P; Takemoto, R M; Pavanelli, G C

2013-06-01

35

NRC inventory of dams  

SciTech Connect

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 US as of February 1, 1982. Of the 85 listed nuclear power plants (148 units), 26 plants obtain cooling water from impoundments formed by dams. The 51 dams associated with the plants are: located on a plant site (29 dams at 15 plant sites); located off site but provide plant cooling water (18 dams at 11 additional plant sites); and located upstream from a plant (4 dams) - they have been identified as dams whose failure, and ensuing plant flooding, could result in a radiological risk to the public health and safety. The dams that might be considered NRC's responsibility in terms of the federal dam safety program are identified. This group of dams (20 on nuclear power plant sites and 14 uranium mill tailings dams) was obtained by eliminating dams that do not pose a flooding hazard (e.g., submerged dams) and dams that are regulated by another federal agency. The report includes the principal design features of all dams and related useful information.

Lear, G.E.; Thompson, O.O.

1983-01-01

36

Political benefits as barriers to assessment of environmental costs in Brazil's Amazonian development planning: The example of the Jatapu Dam in Roraima  

NASA Astrophysics Data System (ADS)

Development projects are rapidly changing the landscape in Brazilian Amazonia. Environmental impact assessments have been required since 1986, and the regulatory system is evolving as precedents are set by each new development project. The Jatapu Dam in Roraima provides an illustration of underlying impediments to assessment of environmental costs and to due consideration being given to these assessments when decisions are made. The high priority placed on the dam by the Roraima state government is unexplainable in terms of economic returns. The place of the dam in a long-term political strategy provides the best of several possible explanations, any one of which is incompatible with a “rational” weighing of economic and environmental costs and benefits. A number of lessons can be drawn from the experience of Jatapu, but some of the problems have no solution. The barriers to rational decision making illustrated by Jatapu apply to development projects in many parts of the world.

Fearnside, Philip M.; Barbosa, Reinaldo Imbrozio

1996-09-01

37

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

38

Integrated Dam Assessment Models Towards Sustainability of Dams  

E-print Network

, and by the natural environment" (WCD 2000) #12;Dams in, out, and reoperated #12;Dams out: Dam removal in America (2005) ~5,000 Dam removal in America #12;Impacts of dam removal · Fate of released sediment? · ImpactsIntegrated Dam Assessment Models ­ Towards Sustainability of Dams Desiree Tullos, Bryan Tilt, Phil

Tullos, Desiree

39

DAM Safety and Deformation Monitoring in Dams  

NASA Astrophysics Data System (ADS)

Water is the life and necessity to water is increasing day by day with respect to the World population, rising of living standards and destruction of nature. Thus, the importance of water and water structures have been increasing gradually. Dams are among the most important engineering structures used for water supplies, flood controls, agricultural purposes as well as drinking and hydroelectric power. There are about 150.000 large size dams in the World. Especially after the Second World War, higher and larger capacity dams have been constructed. Dams create certain risks like the other manmade structures. No one knows precisely how many dam failures have occurred in the World, whereas hundreds of dam failures have occurred throughout the U.S. history. Some basic physical data are very important for assessing the safety and performance of dams. These are movement, water pressure, seepage, reservoir and tail-water elevations, local seismic activities, total pressure, stress and strain, internal concrete temperature, ambient temperature and precipitation. These physical data are measured and monitored by the instruments and equipment. Dams and their surroundings have to be monitored by using essential methods at periodic time intervals in order to determine the possible changes that may occur over the time. Monitoring programs typically consist of; surveillance or visual observation. These programs on dams provide information for evaluating the dam's performance related to the design intent and expected changes that could affect the safety performance of the dam. Additionally, these programs are used for investigating and evaluating the abnormal or degrading performance where any remedial action is necessary. Geodetic and non-geodetic methods are used for monitoring. Monitoring the performance of the dams is critical for producing and maintaining the safe dams. This study provides some information, safety and the techniques about the deformation monitoring of the dams. Therefore, this study gives essential information about the dam safety and related analysis. Monitoring of dams is crucial since deformation might have occurred as a result of erosion, water load, hydraulic gradients, and water saturation. The case study is the deformation measurements of Ataturk Dam. This dam was constructed on Firat River and it has importance for providing drinking water, hydroelectric power and especially irrigation. In addition, brief information is given about this dam and the methods of geodetic and non-geodetic monitoring measurements applied by various disciplines. Geodetic monitoring methods are emphasized in this study. Some results have been obtained from this method for nearly seven years are presented in this work. In addition, some deformation predictions have been made especially for the cross sections where the maximum deformations took place.

Kalkan, Y.; Bilgi, S.; Potts, L.; Miiama, J.; Mahgoub, M.; Rahman, S.

2013-12-01

40

CRIB DAM, LOOKING ALONG DAM FROM WEST ABUTMENT, SHOWING PLANK ...  

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

CRIB DAM, LOOKING ALONG DAM FROM WEST ABUTMENT, SHOWING PLANK SHEATHING IN FOREGROUND. VIEW TO EAST - Kachess Dam, 1904 Cascade Canal Company Crib Dam, Kachess River, 1.5 miles north of Interstate 90, Easton, Kittitas County, WA

41

49. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM ...  

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

49. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM -- DAM CONCRETE -- TYPICAL PIER ISOMETRIC. M-L 26(R) 40/1 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26R, Alton, Madison County, IL

42

50. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM ...  

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

50. LOCK AND DAM NO. 26 (REPLACEMENT). FIRST STAGE DAM -- DAM CONCRETE -- GENERAL ARRANGEMENT -- SECTION AND ELEVATIONS. M-L 26(R) 40/3 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26R, Alton, Madison County, IL

43

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

44

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

45

Reported tailings dam failures  

Microsoft Academic Search

A detailed search and re-evaluation of the known historical cases of tailings dam failure was carried out. A corpus of 147 cases of worldwide tailings dam disasters, from which 26 located in Europe, was compiled in a database. This contains six sections, including dam location, its physical and constructive characteristics, actual and putative failure cause, sludge hydrodynamics, socio-economical consequences and

M. Rico; G. Benito; A. R. Salgueiro; A. D ´ õez-Herrero; H. G. Pereira

2008-01-01

46

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

47

Bringing Down Our Dams: Trends in American Dam Removal Rationales  

Microsoft Academic Search

Over 76,000 dams have been constructed on American rivers to provide services such as flood protection, water storage, hydroelectric power, and navigation. Although most dams continue to provide sufficient benefits to retain the structure, dam removal is becoming increasingly common. This study involved the construction of a dam removal database to analyze spatial and temporal trends in dam removal. The

Molly M. Pohl

2002-01-01

48

ECHETA DAM SPILLWAY. COMING OUT BELOW THE DAM. AT CENTER ...  

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

ECHETA DAM SPILLWAY. COMING OUT BELOW THE DAM. AT CENTER OF PHOTO. VIEW TO NORTHEAST. - Echeta Dam & Reservoir, 2.9 miles east of Echeta Road at Echeta Railroad Siding at County Road 293, Echeta, Campbell County, WY

49

Durability Assessment of an Arch Dam using Inverse Analysis with Neural Networks and High Performance Computing.  

E-print Network

Durability Assessment of an Arch Dam using Inverse Analysis with Neural Networks and High de Brasília diannemv@guarany.cpd.unb.br Abstract: In the present work, an analysis of the Funil dam, a double curvature arch dam placed in the state of Rio de Janeiro, Brazil, is presented. The considered

Coutinho, Alvaro L. G. A.

50

Cold Air Damming  

NSDL National Science Digital Library

Cold Air Damming is part of the Mesoscale Meteorology Primer series. This module first presents a Navy forecast scenario prior to the development of a major cold air damming (CAD) event along the east slopes of the Appalachian Mountains. Then, from a conceptual standpoint, the classic CAD scenario is described in detail, both from an observational and modeling standpoint.

Comet

2001-06-18

51

GeoGuide: Dams!  

NSDL National Science Digital Library

The site offers an interactive discussion of different vantage points associated with dam building. It describes some of the engineering and environmental issues that go into the process of selecting a site for building a dam and the conditions necessary for electrical generation. Links to classroom and family activities are organized by grade level.

52

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...

53

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

54

Legal Perspectives on Dam Removal  

Microsoft Academic Search

Although economic, engineering, and ecological concerns drive the debate about whether to remove or repair a dam, public acceptance of change may be the ultimate determining factor. Nonetheless, little research has looked at the socioeconomic aspects of dam removal. Drawing on Wisconsin's experience with small dam removal, this chapter synthesizes the major public concerns about dam removal and introduces the

MARGARET B. BOWMAN; Sara E. Johnson

2002-01-01

55

Floods from tailings dam failures  

Microsoft Academic Search

This paper compiles the available information on historic tailings dam failures with the purpose to establish simple correlations between tailings ponds geometric parameters (e.g., dam height, tailings volume) and the hydraulic characteristics of floods resulting from released tailings. Following the collapse of a mining waste dam, only a part of tailings and polluted water stored at the dam is released,

M. Rico; G. Benito; A. Díez-Herrero

2008-01-01

56

SEISMIC OBSERVATION IN IRRIGATION DAM  

Microsoft Academic Search

A large number of irrigation dams have been constructed in Japan. Strong earthquakes have often occurred and seismic observations in fill dams are very important for safety and countermeasures. Seismometers have been installed in 156 high irrigation dams since 1954 and seismic accelerations observed. Dynamic dam behavior is investigated by seismic observation records at the National Institute for Rural Engineering

Tamotsu FURUYA

57

Downscaling of a global climate model for estimation of runoff, sediment yield and dam storage: A case study of Pirapama basin, Brazil  

NASA Astrophysics Data System (ADS)

The coastal zone of northeastern Brazil is characterized by intense human activities and by large settlements and also experiences high soil losses that can contribute to environmental damage. Therefore, it is necessary to build an integrated modeling-forecasting system for rainfall-runoff erosion that assesses plans for water availability and sediment yield that can be conceived and implemented. In this work, we present an evaluation of an integrated modeling system for a basin located in this region with a relatively low predictability of seasonal rainfall and a small area (600 km2). The National Center for Environmental Predictions - NCEP’s Regional Spectral Model (RSM) nested within the Center for Weather Forecasting and Climate Studies - CPTEC’s Atmospheric General Circulation Model (AGCM) were investigated in this study, and both are addressed in the simulation work. The rainfall analysis shows that: (1) the dynamic downscaling carried out by the regional RSM model approximates the frequency distribution of the daily observed data set although errors were detected in the magnitude and timing (anticipation of peaks, for example) at the daily scale, (2) an unbiased precipitation forecast seemed to be essential for use of the results in hydrological models, and (3) the information directly extracted from the global model may also be useful. The simulated runoff and reservoir-stored volumes are strongly linked to rainfall, and their estimation accuracy was significantly improved at the monthly scale, thus rendering the results useful for management purposes. The runoff-erosion forecasting displayed a large sediment yield that was consistent with the predicted rainfall.

Braga, Ana Cláudia F. Medeiros; Silva, Richarde Marques da; Santos, Celso Augusto Guimarães; Galvão, Carlos de Oliveira; Nobre, Paulo

2013-08-01

58

Seismic rehabilitation of earth dams  

SciTech Connect

The purpose of this paper is to present methods available for engineered remediation of seismically deficient earth dams (not including tailings dams), to review their strengths and weaknesses, to present case histories of the application of these methods, and to draw conclusions about the state of practice. A survey of completed and active rehabilitation projects was made. This survey identified 30 dams with engineering fixes and 22 with operational fixes. Data was obtained and is presented in tabular form for 36 dams. Of these dams, 13 had seismically deficient foundations, 15 had deficient embankments, and 8 had deficiencies in both embankment and foundations. Synopses of case histories are presented for John Hart Dam, Sardis Dam, Mormon Island Auxiliary Dam, and Pleasant Valley Dam.

Marcuson, W.F. III; Hadala, P.F.; Ledbetter, R.H. [Army Engineer Waterways Experiment Station, Vicksburg, MS (United States)] [Army Engineer Waterways Experiment Station, Vicksburg, MS (United States)

1996-01-01

59

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

60

Lake Nyos Dam  

NASA Astrophysics Data System (ADS)

Lake Nyos, or to be more precise, the upper 38 m of Lake Nyos, is held back by a natural dam (Figure 1) which, if it were to fail, would wreak havoc in the valleys to the north and cause a serious flood to surge down the Katsina Ala into Nigeria. Lockwood et al., [1987], who have been investigating the Lake Nyos gas disaster, which killed an estimated 1700 people in August 1986, presented a paper on the potential for disastrous failure of the Lake Nyos dam to the AGU Fall Meeting. Part of what they said was subsequently reported in New Scientist (December 10, 1987, p. 18). They have placed on record their view that the dam is only 400 years old and are reported to have stated that it is eroding away at the alarming rate of 1.5 m/yr. If their figures are correct, then surely the dam will fail within a decade or two at the most, and there is indeed cause for alarm and immediate action. However, teams from Cameroon, France, Italy, Japan , Switzerland, Britain, Nigeria, and Germany also visited Lake Nyos in the immediate aftermath of the gas disaster, and none of their reports have suggested that the dam is in itself an imminent threat.

Freeth, S. J.

61

2. GENERAL VIEW OF MORRIS DAM RESERVOIR SHOWING MORRIS DAM ...  

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

2. GENERAL VIEW OF MORRIS DAM RESERVOIR SHOWING MORRIS DAM TEST FACILITY LOOKING SOUTHWEST TOWARD AZUZA, Date unknown, circa 1960's. - Variable Angle Launcher Complex, CA State Highway 39 at Morris Reservior, Azusa, Los Angeles County, CA

62

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

63

Bringing Down Our Dams: Trends in American Dam Removal Rationales  

NASA Astrophysics Data System (ADS)

Over 76,000 dams have been constructed on American rivers to provide services such as flood protection, water storage, hydroelectric power, and navigation. Although most dams continue to provide sufficient benefits to retain the structure, dam removal is becoming increasingly common. This study involved the construction of a dam removal database to analyze spatial and temporal trends in dam removal. The data included information on 417 cases of dismantled American dams, 153 with known rationales for removal. Database analysis indicated that the leading purposes for dismantling structures are safety concerns and interest in environmental restoration. There is substantial geographic variability in dam removal rationales, with California leading in razing dams for environmental purposes, and Wisconsin leading in economic and safety rationales. States with substantial removals tend to have programs that support and fund dam razing. Although removals for safety reasons have been increasing steadily in the past three decades, environmental removals made a rather dramatic and sudden entry into the dam removal arena in the 1990s. Analysis of spatial and temporal trends in dam razing are of particular significance given the likely increase in dam removals in the 21st Century.

Pohl, Molly M.

2002-12-01

64

ECHETA DAM RIPRAP ON RESERVOIR SIDE OF THE DAM AT ...  

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

ECHETA DAM RIP-RAP ON RESERVOIR SIDE OF THE DAM AT BREACH. VIEW TO NORTH-NORTHEAST. - Echeta Dam & Reservoir, 2.9 miles east of Echeta Road at Echeta Railroad Siding at County Road 293, Echeta, Campbell County, WY

65

32. AERIAL VIEW OF TIETON DAM, UPSTREAM FACE OF DAM ...  

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

32. AERIAL VIEW OF TIETON DAM, UPSTREAM FACE OF DAM (Trashrack-structure for outlet at lower left in reservoir, spillway at upper left. Reservoir nearly empty due to drought.) - Tieton Dam, South & East of State Highway 12, Naches, Yakima County, WA

66

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

67

INTERNATIONAL COMMISSION ON LARGE DAMS  

E-print Network

Q76-R INTERNATIONAL COMMISSION ON LARGE DAMS 20TH CONGRESS BEIJING, CHINA THE STATUS OF METHODS FOR ESTIMATION OF THE PROBABILITY OF FAILURE OF DAMS FOR USE IN QUANTITATIVE RISK ASSESSMENT (* ) Robin FELL. INTRODUCTION The use of Quantitative Risk Assessment (QRA) techniques to assist in dam safety management

Bowles, David S.

68

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

69

Fish reproductive guilds downstream of dams.  

PubMed

Fish reproductive guilds were used to evaluate the responses of species with different reproductive strategies during two different periods of post-dam construction. The data used for the comparisons were collected in the upper Paraná River floodplain (Brazil), downstream of the Porto Primavera dam, 2 and 10 years after impoundment. The abundance (catch per unit effort, CPUE), species richness, evenness and structure of communities, all within reproductive guilds, were used to test the hypothesis that these metrics vary spatially and temporally. The influence of damming on species structure and the diversity of fish reproductive guilds varied spatiotemporally, and species with opportunistic reproductive strategies tended to be less affected. Conversely, long-distance migratory species responded more markedly to spatiotemporal variations, indicating that the ecosystem dynamics exert greater effects on populations of these species. Thus, the effects of a dam, even if attenuated, may extend over several years, especially downstream. This finding emphasizes the importance of maintaining large undammed tributaries downstream of reservoirs. PMID:25230203

Vasconcelos, L P; Alves, D C; Gomes, L C

2014-11-01

70

Political Economy of Brazilian foreign policy: nuclear energy, trade, and Itaipu  

Microsoft Academic Search

This dissertation advances an analytical framework intended to account for the international strategies of semi-peripheral countries: those industrialized Third World countries able to manufacture and export industrial goods. The empirical validation of the proposed framework was assessed through five case studies of Brazil's conduct in the following issue areas: nuclear energy, trade, and hydroelectric development of the Parana River Basin.

Soares de Lima

1986-01-01

71

Dam Removal Express Assessment Models (DREAM)  

Microsoft Academic Search

Many dams have been removed in the recent decades in the U.S. for reasons including economics, safety, and ecological rehabilitation. More dams are under consideration for removal; some of them are medium to large-sized dams filled with millions of cubic meters of sediment. Reaching a decision to remove a dam and deciding as how the dam should be removed, however,

Yantao Cui; Gary Parker; Christian Braudrick; William E Dietrich; Brian Cluer

2006-01-01

72

Geological causes of dam incidents  

Microsoft Academic Search

Summary  This General Report presents synoptic case histories of several dam failures or accidents where the mechanism for the incident\\u000a was related to the geology. The failures of Teton Dam, Baldwin Hills Reservoir, and Malpasset Dam are attributed, respectively,\\u000a to pervious rock, subsidence or pressurization of a fault, and reservoir induced pressure of abutment rock. The near catastrophe\\u000a of San Fernando

Ch. G. Flagg

1979-01-01

73

Diversity and genetic distance in populations of Steindachnerina in the upper Paraná river floodplain of Brazil.  

PubMed

Whereas four species of the genus Steindachnerina occur in the Paraná river basin, S. insculpta was the only endemic species of the region under analysis, which is the third lower section of the upper Paraná river. Among other factors, this species has been characterised by the absence of spots in the basal region of the dorsal fin. However, various specimens with this characteristic appeared in the region after the construction of the Itaipu Hydroelectric Plant in 1982. An analysis of the genetic variability of Steindachnerina populations with or without spots is provided. Specimens were collected in different sites of the floodplain of the upper Paraná river and samples were compared by random amplified polymorphic DNA (RAPD) technique and morphological analyses. Ninety-eight amplified loci with nine random primers were analysed in 19 specimens of each phenotype. Data for genetic distance showed great divergences between the two phenotypes and indicate two different species. Spotted specimens may be identified as S. brevipinna, found in the region downstream Sete Quedas Falls. The species must have overcome the geographical barrier during the building of the Itaipu hydroelectric dam that submerged the waterfalls and which became an obstacle between the upper and middle Paraná river some 150 km downstream. Since phenotypes do not share dominant alleles, absence of gene flow has been suggested. PMID:12440565

Oliveira, A V; Prioli, A J; Prioli, S M A P; Pavanelli, C S; Júlio, H F; Panarari, R S

2002-08-01

74

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

75

76 FR 12094 - Whitman River Dam, Inc.  

Federal Register 2010, 2011, 2012, 2013

...Commission [Project No. 13237-002] Whitman River Dam, Inc. Notice of Application Tendered for Filing...February 14, 2011. d. Applicant: Whitman River Dam, Inc. e. Name of Project: Crocker Dam Hydro Project. f. Location: On the Whitman...

2011-03-04

76

Conflicts Associated with Dam Removal in Sweden  

Microsoft Academic Search

ABSTRACT. The increasing number,of deterioratingold dams that need renovation or have lost their function make,dam removal a viable management,option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail,

Anna G. C. Lejon; Birgitta Malm Renöfält; Christer Nilsson

77

Hoover Dam and Hydroelectric Power  

NSDL National Science Digital Library

This video segment is adapted from Building Big, a PBS series hosted by David Macaulay. It explores Hoover Dam's hydroelectric capabilities by explaining how it is able to harness the potential energy stored in the reservoir and convert it to electricity. It also discusses environmental impacts of the dam and others like it.

Foundation, Wgbh E.; Domain, Teachers'

78

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

79

War damages and reconstruction of Peruca dam  

SciTech Connect

The paper describes the heavy damages caused by blasting in the Peruca rockfill dam in Croatia in January 1993. Complete collapse of the dam by overtopping was prevented through quick action of the dam owner by dumping clayey gravel on the lowest sections of the dam crest and opening the bottom outlet of the reservoir, thus efficiently lowering the water level. After the damages were sufficiently established and alternatives for restoration of the dam were evaluated, it was decided to construct a diaphragm wall through the damaged core in the central dam part as the impermeable dam element and to rebuild the central clay core at the dam abutments. Reconstruction works are described.

Nonveiller, E. [Univ. of Zagreb (Croatia). Faculty of Civil Engineering] [Univ. of Zagreb (Croatia). Faculty of Civil Engineering; Rupcic, J. [Univ. of Zagreb (Croatia). Faculty of Civil Engineering] [Univ. of Zagreb (Croatia). Faculty of Civil Engineering; [Elektroprojekt Consulting Engineering, Zagreb (Croatia); Sever, Z. [Elektroprojekt Consulting Engineering, Zagreb (Croatia)] [Elektroprojekt Consulting Engineering, Zagreb (Croatia)

1999-04-01

80

Synthesizing Studies of Dam Removal  

NASA Astrophysics Data System (ADS)

Dam decommissioning is rapidly emerging as an important river restoration strategy in the United States. Hundreds of dams have been removed in the past few decades, including several large ones (>10-15 meters) impounding large sediment volumes (>106 cubic meters) in the past 3 years, notably Condit Dam and the Elwha River dams in Washington State. These removals and the associated studies provide for the first time an opportunity to evaluate the immediate and persistent consequences of these significant fluvial—and in some cases, coastal—perturbations. Understanding dam removal response not only improves understanding of landscape and ecosystem adjustment to profound sediment pulses but also provides important lessons for future watershed restoration efforts.

O'Connor, Jim; East, Amy

2014-10-01

81

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

82

Is it worth a dam?  

PubMed Central

Once a sign of modernization and growth, dams are often seen today as symbols of environmental and social devastation. Over 800,000 dams have been built worldwide to provide drinking water, flood control, hydropower, irrigation, navigation, and water storage. Dams do indeed provide these things,but at the cost of several adverse, unexpected effects: disruption of ecosystems, decline of fish stocks, forced human and animal resettlements, and diseases such as malaria, which are borne by vectors that thrive in quiet waters. PMID:9349830

Joyce, S

1997-01-01

83

DAMS WITH IMPERVIOUS MEMBRANE OF ASPHALT CONCRETE  

Microsoft Academic Search

Even though the earth dams have been constructed since the earliest times, it is the increase of our ability to build safer and economical structures, which makes those dams even more acceptable. The earth dams can be constructed with impervious membranes of manufactured materials such as concrete, steel and asphalt concrete. These dams are safer against shear failure than any

Kusari Laura; Ahmedi Figene

84

GATC Flanking Sequences Regulate Dam Activity: Evidence for how Dam Specificity may Influence  

E-print Network

contribute to the diverse biological roles of Dam. q 2005 Elsevier Ltd. All rights reserved. Keywords: Dam, the mechanisms whereby Dam methylation differentially affects diverse biological pathways is poorly understoodGATC Flanking Sequences Regulate Dam Activity: Evidence for how Dam Specificity may Influence pap

Reich, Norbert O.

85

FORMATION AND FAILURE OF NATURAL DAMS.  

USGS Publications Warehouse

Of the numerous kinds of dams that form by natural processes, dams formed from landslides, glacial ice, and late-neoglacial moraines present the greatest threat to people and property. Landslide dams form a wide range of physiographic settings. The most common types of mass movements that form landslide dams are rock and debris avalanches; rock and soil slumps and slides; and mud, debris, and earth flows. The most common initiation mechanisms for dam-forming landslides are excessive rainfall and snowmelt and earthquakes. Natural dams may cause upstream flooding as the lake rises and downstream flooding as a result of failure of the dam. Although data are few, for the same potential energy at the dam site, downstream flood peaks from the failure of glacier-ice dams are smaller than those from landslide, moraine, and constructed earth-fill and rock-fill dam failures.

Costa, John E.; Schuster, Robert L.

1988-01-01

86

The Classification of Rockslide Dams  

Microsoft Academic Search

\\u000a It is suggested that rockslide – rock avalanche dams are more complex than is recognized in existing landslide dam classifications.\\u000a A classification system is proposed emphasizing the three-dimensional relations of the landslide deposit to valley morphology.\\u000a This system combines a three-step classification taking account of: (A) the plan view distribution of the deposit in relation\\u000a to valley morphology and the

Reginald L. Hermanns; Kenneth Hewitt; Alexander Strom; Stephen G. Evans; Stuart A. Dunning; Gabriele Scarascia-Mugnozza

87

States improve dam safety legislation and regulations  

SciTech Connect

Several state dam safety agencies have helped their state governments pass new dam safety legislation of regulations during the past year. Improvements in the laws range from establishing or raising permit fees, to boosting requirements for professional licenses, to requiring emergency action plans for all significant and high-hazard dams. ASDSO tracks dam safety legislation and laws to help keep the association's members informed on progress in dam safety. In New Jersey, lawmakers passed legislation providing $1.7 million in loans for engineering studies on high-hazard dams. Similarly in Minnesota, lawmakers approved legislation providing $1.6 million for repair or removal of dams. In Colorado, new legislation creates an emergency dam repair cash fund for state engineers to cover costs of emergency actions. In South Carolina, the General Assembly passed major amendments to the Dams and Reservoirs Safety Act. The amendments require that dam owners notify the state within 30 days after title to a dam is transferred, and stipulate that owners of high-hazard and significant hazard dams prepare emergency action plans. The state also may require normal maintenance on a dam; previously, the dam had to be declared unsafe before and order could be issued. A number of other states are working on new legislation, guidelines, or regulations, including Massachusetts, New York, Washington, and Wyoming. Forty-eight states have dam safety legislation in place; Alabama and Delaware are without such legislation.

Spragens, L. (ASDSO, Lexington, KY (United States))

1993-05-01

88

Drawing by J. Spenser Introduction & the physics basis for the dipole concept  

E-print Network

of neoclassical) confinement Convective cells may improve ash removal without degrading energy confinement Very (not neutron transport) is used for energy extraction Fast triton removal (via drift-resonance pump Itaipu Dam, completed in 1982 on the Parana River between Brazil and Paraguay, will eventually generate

89

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

90

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

91

American Experience: Grand Coulee Dam  

NSDL National Science Digital Library

Among many great national achievements during the Great Depression, the Grand Coulee Dam remains one of the most impressive. This fine website from the American Experience program complements a documentary that was first aired on PBS in 2012. The construction of this dam would, in the worlds of President Franklin Roosevelt, be part of a "planned promised land" that would transform the lives of farm families. The site includes a great interactive timeline, a photo gallery, and a short preview of the entire film. Additionally, the site includes two nice bonus videos, including one that deals with the processes of closing the spillway. The blog on the site includes several interesting posts on the history of the dam. Also, visitors have the opportunity to share their own stories about their own favorite iconic structures in the United States.

2012-04-27

92

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

93

OVERALL VIEW OF CASCADE CANAL COMPANY CRIB DAM, LOOKING UPSTREAM ...  

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

OVERALL VIEW OF CASCADE CANAL COMPANY CRIB DAM, LOOKING UPSTREAM FROM DIRECTION OF KACHESS DAM. VIEW TO NORTH - Kachess Dam, 1904 Cascade Canal Company Crib Dam, Kachess River, 1.5 miles north of Interstate 90, Easton, Kittitas County, WA

94

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

95

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2013 CFR

...available from FEMA: (i)“Emergency Action Planning Guidelines for Dams,”FEMA 64. (ii)“Federal Guidelines for Earthquake Analysis and Design of Dams,”FEMA 65. (iii)“Federal Guidelines for Selecting and Accommodating Inflow Design...

2013-01-01

96

Simulation of Breach Outflow for Earthfill Dam  

NASA Astrophysics Data System (ADS)

Dams have been built for many reasons such as irrigation, hydropower, flood mitigation, and water supply to support development for the benefit of human. However, the huge amount of water stored behind the dam can seriously pose adverse impacts to the downstream community should it be released due to unwanted dam break event. To minimise the potential loss of lives and property damages, a workable Emergency Response Plan is required to be developed. As part of a responsible dam owner and operator, TNB initiated a study on dam breach modelling for Cameron Highlands Hydroelectric Scheme to simulate the potential dam breach for Jor Dam. Prediction of dam breach parameters using the empirical equations of Froehlich and Macdonal-Langridge-Monopolis formed the basis of the modelling, coupled with MIKE 11 software to obtain the breach outflow due to Probable Maximum Flood (PMF). This paper will therefore discuss the model setup, simulation procedure and comparison of the prediction with existing equations.

Razad, Azwin Zailti Abdul; Sabri Muda, Rahsidi; Mohd Sidek, Lariyah; Azia, Intan Shafilah Abdul; Hanum Mansor, Faezah; Yalit, Ruzaimei

2013-06-01

97

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2010 CFR

...available from FEMA: (i)“Emergency Action Planning Guidelines for Dams,”FEMA 64. (ii)“Federal Guidelines for Earthquake Analysis and Design of Dams,”FEMA 65. (iii)“Federal Guidelines for Selecting and Accommodating Inflow Design...

2010-01-01

98

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2011 CFR

...available from FEMA: (i)“Emergency Action Planning Guidelines for Dams,”FEMA 64. (ii)“Federal Guidelines for Earthquake Analysis and Design of Dams,”FEMA 65. (iii)“Federal Guidelines for Selecting and Accommodating Inflow Design...

2011-01-01

99

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

100

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

Microsoft Academic Search

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

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

2005-01-01

101

MASTER PLAN ChiefJosephDamHatcheryProgram This Chief Joseph Dam Hatchery Program Master Plan  

E-print Network

#12;i MASTER PLAN ChiefJosephDamHatcheryProgram This Chief Joseph Dam Hatchery Program Master Plan Fisheries Enhancement Group ChiefJosephDam HatcheryProgram M A S T E R P L A N #12;ChiefJosephDamSummary "A Columbia River ecosystem that sustains an abundant, productive, and diverse community of fish

102

Using resistivity measurements for dam safety evaluation at Enemossen tailings dam in southern Sweden  

Microsoft Academic Search

Internal erosion is a major reason for embankment dam failures. Resistivity measurements is an essentially non-destructive technique, which may have the possibility of detecting internal erosion processes and anomalous seepage at an early stage before the safety of the dam is at stake. This paper presents results from part of a dam safety investigation conducted at the Enemossen tailings dam

P. Sjödahl; T. Dahlin; S. Johansson

2005-01-01

103

Concrete dam on the Bratsk hydroelectric station  

Microsoft Academic Search

The Bratsk concrete dam was designed and constructed with a sufficient degree of reliability. Settlement of the dam together with the powerhouse developed uniformly under the entire foundation. Two irreversible processes causing aging of the dam have been established by operating observations: leaching of the concrete and decompression of the contact zone of the foundation near the upstream face of

Soloveva

1988-01-01

104

Disrupting biogeochemical cycles - Consequences of damming  

Microsoft Academic Search

Sustainable management of natural water resources should include environmentally sound dam construction and operation with respect to both upstream and downstream management. Because of slowly evolv- ing alterations in riverine ecosystems following the con- struction of a dam - due to the sometimes large distances between dams and affected areas, and the interference with other anthropogenic activities - some of

Gabriela Friedl; Alfred Wüest

2002-01-01

105

TECHNICAL ISSUES IN SMALL DAM REMOVAL ENGINEERING  

Microsoft Academic Search

With thousands of communities facing decisions regarding aging small dams, dam removal is often a viable option to restore aquatic habitat and relieve what can be an economic burden and public safety hazard. Although more than 500 dams have been removed from rivers and streams throughout the United States, there is relatively little published information available to guide resource managers

Brian E. Graber; Margaret Bowman; R. Scott Carney; Martin W. Doyle; Madeline Fisher; Scudder D. Mackey; Laura Wildman

106

Dam Removal Express Assessment Models (DREAM)  

Microsoft Academic Search

This paper presents sample runs of the Dam Removal Express Assessment Models (DREAM) presented in the companion paper, Cui et al. (2006): DREAM-1 for simulation of sediment transport following the removal of a dam behind which the reservoir deposit is composed primarily of noncohesive sand and silt, and DREAM-2 for simulation of sediment transport following the removal of a dam

Yantao Cui; Christian Braudrick; William E. Dietrich; Brian Cluer; Gary Parker

2006-01-01

107

30 CFR 56.20010 - Retaining dams.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2012-07-01

108

30 CFR 56.20010 - Retaining dams.  

...2014-07-01 2014-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2014-07-01

109

30 CFR 57.20010 - Retaining dams.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2013-07-01

110

30 CFR 56.20010 - Retaining dams.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2013-07-01

111

30 CFR 57.20010 - Retaining dams.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2012-07-01

112

30 CFR 57.20010 - Retaining dams.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2011-07-01

113

30 CFR 56.20010 - Retaining dams.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Retaining dams. 56.20010 Section 56.20010 Mineral...MINES Miscellaneous § 56.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2011-07-01

114

30 CFR 57.20010 - Retaining dams.  

...2014-07-01 2014-07-01 false Retaining dams. 57.20010 Section 57.20010 Mineral...MINES Miscellaneous § 57.20010 Retaining dams. If failure of a water or silt retaining dam will create a hazard, it shall be of...

2014-07-01

115

Trends in Tailing Dam Safety  

Microsoft Academic Search

Recent releases of tailing effluents and solids from containment facilities around the world, including Mary Spruitt (1994), Omai (1995) and Marcopper (1996), have heightened awareness that risks associated with tailing containment must be fully addressed during all phases of a facility life. Recent studies by independent international organizations (United Nations Environment Programme (UNEP), 1996; United Stated Committee on Large Dams

Iain G. Bruce; Clint Logue; Lori-Ann Wilchek

116

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

117

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

118

Water and Dams in Today's World  

NSDL National Science Digital Library

Students learn about the importance of dams by watching a video that presents historical and current information on dams, as well as descriptions of global water resources and the hydrologic cycle. Students also learn about different types of dams, all designed to resist the forces on dams. (If the free, 15-minute "Water and Dams in Today's World" video cannot be obtained in time, the lesson can still be taught. See the Additional Multimedia Support section for how to obtain the DVD or VHS videotape, or a PowerPoint presentation with similar content [also attached].)

Integrated Teaching And Learning Program

119

Seismic safety of high concrete dams  

NASA Astrophysics Data System (ADS)

China is a country of high seismicity with many hydropower resources. Recently, a series of high arch dams have either been completed or are being constructed in seismic regions, of which most are concrete dams. The evaluation of seismic safety often becomes a critical problem in dam design. In this paper, a brief introduction to major progress in the research on seismic aspects of large concrete dams, conducted mainly at the Institute of Water Resources and Hydropower Research (IWHR) during the past 60 years, is presented. The dam site-specific ground motion input, improved response analysis, dynamic model test verification, field experiment investigations, dynamic behavior of dam concrete, and seismic monitoring and observation are described. Methods to prevent collapse of high concrete dams under maximum credible earthquakes are discussed.

Chen, Houqun

2014-08-01

120

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 west. Construction of the forebay dam, which replaced the eastern end of the original Grand Coulee Dam, was completed in 1974. - Columbia Basin Project, Grand Coulee Dam & Franklin D. Roosevelt Lake, Across Columbia River, Southeast of Town of Grand Coulee, Grand Coulee, Grant County, WA

121

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

122

Earthquake induced deformation of earth dams  

Microsoft Academic Search

The paper summarizes the different modes of failure affecting earth dams as a consequence of earthquake shaking. A case study\\u000a is presented to illustrate seismic deformation analysis using the Alibey Earth Dam, Istanbul, Turkey as an example. The dynamic\\u000a behaviour, failure modes and mechanisms of failure of the dam under possible ground motions were investigated. The results\\u000a from finite element

Bilge Siyahi; Haydar Arslan

2008-01-01

123

Downstream effects of dams on alluvial rivers  

Microsoft Academic Search

This study describes changes in mean channel-bed elevation, channel width, bed-material sizes, vegetation, water discharges, and sediment loads downstream from 21 dams constructed on alluvial rivers. Most of the studied channels are in the semiarid western US. Flood peaks generally were decreased by the dams, but in other respects the post-dam water-discharge characteristics varied from river to river. Sediment concentrations

G. P. Williams; M. G. Wolman

1985-01-01

124

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

125

Green River Locks and Dams 3, 4, 5, 6 and Barren River Lock and Dam 1 Disposition, Kentucky  

E-print Network

Green River Locks and Dams 3, 4, 5, 6 and Barren River Lock and Dam 1 Disposition, Kentucky 16 September 2014 ABSTRACT: Green River Locks and Dams 3 through 6 and Barren River Lock and Dam 1 were. The Green River Locks and Dams 5 and 6 ceased operations in 1951 due to a marked decline in navigation

US Army Corps of Engineers

126

CASE STUDY OF ITOSHIRO DAM ON SOIL PRODUCTION AREA CAUSING DAM SEDIMENTATION  

NASA Astrophysics Data System (ADS)

The purpose of this study is to realize effective and efficient countermeasures against reservoir sedimentation in the near future. This paper shows the case study of JPOWER’s Itoshiro Dam regarding analysis of soil production area in the relevant dam’s basin. The authors are trying to clarify the major soil production area causing reservoir sedimentation by geological expertise and Egashira Model.

Kawata, Nobuaki; Momoshima, Akira; Maeda, Shuuichi; Shikano, Kumetoyo; Yoshino, Hideki; Takebayashi, Hiroshi; Fujita, Masaharu

127

Evaluating dam safety retrofits with uncertain benefits: The Case of Mohawk Dam (Walhonding River, Ohio)  

Microsoft Academic Search

Mohawk Dam, part of the Muskingum basin flood control system, was built in 1938 and is operated by the U.S. Army Corps of Engineers (Corps). Since this high-hazard dam could not survive a probable maximum flood (PMF), the Corps conducted a study to determine the least expensive means of enabling the dam to survive a PMF. Applying a previously proposed

Daniel Resendiz-Carrillo; Lester B. Lave

1990-01-01

128

Evaluating Dam Safety Retrofits With Uncertain Benefits: The Case of Mohawk Dam (Walhonding River, Ohio)  

Microsoft Academic Search

Mohawk Dam, part of the Muskingum basin flood control system, was built in 1938 and is operated by the U.S. Army Corps of Engineers (Corps). Since this high-hazard dam could not survive a probable maximum flood (PMF), the Corps conducted a study to determine the least expensive means of enabling the dam to survive a PMF. Applying a previously proposed

Daniel Resendiz-Carrillo; Lester B. Lave

1990-01-01

129

Dams and the fish fauna of the Neotropical region: impacts and management related to diversity and fisheries.  

PubMed

Reservoirs have been built in almost all of the hydrographic basins of Brazil. Their purposes include water supply for cities, irrigation and mainly, generation of electricity. There are more than 700 large dams and associated reservoirs in the large rivers of the country. These reservoirs favor local and regional economic development, but they also bring serious and irreversible alterations in the natural hydrologic regime of rivers, affecting habitat quality and the dynamics of the biota. In the impounded area, the main impact is the change from lotic to lentic water, which influences aquatic fauna, including fishes. Impacts of reservoirs present relevant spatiotemporal variations. Immediately after reservoir formation, fish species richness usually increases due to incorporation of surrounding habitats, but richness decreases as reservoirs age. However, impacts downstream of dams appear to be similar or stronger than those that occur within the reservoir. Dams promote discharge control, altering the seasonal cycles of floods. These effects are augmented when dams are constructed in cascades. Therefore, dams profoundly influence composition and structure of fish assemblages. Most affected species are the rheophilics and long distance migratory that require distinct habitats to fulfill their life cycles. Populations of migratory species may collapse or even disappear in intensely regulated stretches. Management actions taken to minimize impacts of dams in Brazil historically considered construction of fish passages, fishery control and stocking. The results of these actions are questionable and/or with clear failures. In this paper, we give emphasis to the Paraná River basin, the most affected by dams in Brazil. We describe some patterns in the alteration and decline in fish diversity in areas influenced by dams. We also discuss negative consequences in the fishery and ecosystems functioning. Finally, we argue the relevance and the success of the management actions taken and present some suggestions to improve conservation of the ichthyofauna in South American basins influenced by dams. PMID:19197482

Agostinho, A A; Pelicice, F M; Gomes, L C

2008-11-01

130

Dam located to east of powerhouse, view from south. This ...  

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

Dam located to east of powerhouse, view from south. This dam holds back the waters of the Chattahoochee River to form the mill pond north of Riverdale Cotton Mill - Riverdale Cotton Mill, Powerhouse & Dam, Valley, Chambers County, AL

131

4. DETAIL VIEW OF DAM, SHOWING ROLLER GATES, PIERS, HEADHOUSES ...  

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

4. DETAIL VIEW OF DAM, SHOWING ROLLER GATES, PIERS, HEADHOUSES AND DAM BRIDGE, LOOKING EAST, DOWNSTREAM - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

132

3. DETAIL VIEW OF DAM, SHOWING ROLLER AND TAINTER GATES, ...  

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

3. DETAIL VIEW OF DAM, SHOWING ROLLER AND TAINTER GATES, PIERS, HEADHOUSES AND DAM BRIDGE, LOOKING SOUTHEAST, DOWNSTREAM - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

133

9. VIEW OF LATERAL GATE ON CANAL NEAR DAM, LOOKING ...  

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

9. VIEW OF LATERAL GATE ON CANAL NEAR DAM, LOOKING SOUTHEAST - High Mountain Dams in Upalco Unit, Twin Pots Dam, Ashley National Forest, 10.1 miles North of Mountain Home, Mountain Home, Duchesne County, UT

134

3. Upstream face of Rock Creek Diversion Dam, closeup of ...  

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

3. Upstream face of Rock Creek Diversion Dam, close-up of gates, looking southeast - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

135

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public... Operations and Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam...

2011-10-01

136

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public... Operations and Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam...

2010-10-01

137

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2012 CFR

... 2012-10-01 2011-10-01 true Diversions at Derby Dam. 418.18 Section 418.18 Public... Operations and Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam...

2012-10-01

138

5. Downstream face of Rock Creek Diversion Dam, looking west ...  

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

5. Downstream face of Rock Creek Diversion Dam, looking west (Diversion into Irrigation District canal) - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

139

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public... Operations and Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam...

2013-10-01

140

2. OVERALL VIEW OF DAM, SHOWING CREST AND DOWNSTREAM FACE, ...  

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

2. OVERALL VIEW OF DAM, SHOWING CREST AND DOWNSTREAM FACE, WITH CONCRETE EXTENSION IN FOREGROUND, LOOKING NORTH - High Mountain Dams in Bonneville Unit, Fire Lake Dam, Wasatch National Forest, Kamas, Summit County, UT

141

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

142

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

143

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

144

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

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Project No. 6972-032] Hollow Dam Power Company; Ampersand Hollow Dam Hydro, LLC; Notice of Application for Transfer...Motions To Intervene On September 10, 2013, Hollow Dam Power Company (transferor) and Ampersand...

2013-10-01

145

SEDIMENT MANAGEMENT IN FLOOD CONTROL DAMS  

Microsoft Academic Search

Reservoir sedimentation reduces economic value and longevity of flood control dams. Periodic sediment removal allows extension of reservoir life. An optimal control model is developed to evaluate alternative sediment management strategies for flood control dams. An illustrative empirical analysis shows that sustainable management is economically desirable for a wide range of parameter values.

Maneechit Pattanapanchai; Farhed A. Shah; George Annandale

2002-01-01

146

Impact of the Three Gorges Dam  

Microsoft Academic Search

The Three Gorges Dam was built to provide hydroelectric power, flood control, and greater navigation access to the Yangtze River in central China. It is the largest hydroelectric dam in the world and as such is responsible for bringing both unprecedented benefits and risks to the people of the Yangtze River Valley and all of China. In some cases the

Ian Reynolds

2011-01-01

147

Dams and Hydropower for Sustainable Development  

Microsoft Academic Search

The global debate about large dams is at once overwhelmingly complex and fundamentally simple. It is complex because the issues are not confined to the design, construction, and operation of dams themselves but embrace the range of social, environmental, and political choices on which the human aspiration to development and improved well being depend. Over the last two decades, global

I. Yüksel; E. K. Okedu

2009-01-01

148

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

149

A TALE OF FOUR UPSTREAM TAILINGS DAMS  

Microsoft Academic Search

The evaluation and performance of four upstream-constructed tailings dams in South America are presented. All four dams were constructed beginning in the 1990's. The juxtaposition of the same design to four sites, each with unique site and operating conditions, led not surprisingly to four different outcomes. These outcomes ranged from outright failure, to construction of a toe buttress, slope flattening,

T. E. Martin; E. C. McRoberts; M. P. Davies

150

ROV-AIDED DAM INSPECTION: PRACTICAL RESULTS  

Microsoft Academic Search

Nowadays Unmanned Underwater Vehicles (UUVs) are used in a growing number of underwater missions, mostly inspections of different types of installations such as: telecommunication cables, pipes or oil extraction installations. A field where UUVs are still starting to prove their utility is dam inspection. This paper presents details our first approach in dam inspection. A set of experiments carried out

Joan Batlle; Tudor Nicosevici; Rafael Garcia; Marc Carreras

151

Using resistivity measurements for dam safety evaluation at Enemossen tailings dam in southern Sweden  

NASA Astrophysics Data System (ADS)

Internal erosion is a major reason for embankment dam failures. Resistivity measurements is an essentially non-destructive technique, which may have the possibility of detecting internal erosion processes and anomalous seepage at an early stage before the safety of the dam is at stake. This paper presents results from part of a dam safety investigation conducted at the Enemossen tailings dam in southern Sweden. Longitudinal resistivity sections, 2D measurements along the dam crest, provided an overview of the whole dam and served to detect anomalous zones. In selected areas, additional cross-sectional 2D surveys gave detailed information about the geo-electrical situations in the embankments. This information is valuable for similar investigations as information about resistivity in embankment construction material is scarce. Known problem areas were associated with low resistivities, even though the resistivity measurements alone did not provide enough information to confidently come to a decision about the status of the dams.

Sjödahl, P.; Dahlin, T.; Johansson, S.

2005-12-01

152

The Impact of Dam-Reservoir-Foundation Interaction on Nonlinear Response of Concrete Gravity Dams  

SciTech Connect

To study the impact of dam-reservoir-foundation interaction on nonlinear response of concrete gravity dams, a two-dimensional finite element model of a concrete gravity dam including the dam body, a part of its foundation and a part of the reservoir was made. In addition, the proper boundary conditions were used in both reservoir and foundation in order to absorb the energy of outgoing waves at the far end boundaries. Using the finite element method and smeared crack approach, some different seismic nonlinear analyses were done and finally, we came to a conclusion that the consideration of dam-reservoir-foundation interaction in nonlinear analysis of concrete dams is of great importance, because from the performance point of view, this interaction significantly improves the nonlinear response of concrete dams.

Amini, Ali Reza; Motamedi, Mohammad Hossein; Ghaemian, Mohsen [Department of Civil Engineering, Sharif University of Technology, Tehran (Iran, Islamic Republic of)

2008-07-08

153

Groundwater Forecasting Optimization Pertain to Dam Removal  

NASA Astrophysics Data System (ADS)

There is increasing interest in removing dams due to changing ecological and societal values. Groundwater recharge rate is closely connected to reservoir presence or absence. With the removal of dams and their associated reservoirs, reductions in groundwater levels are likely to impact water supplies for domestic, industrial and agricultural use. Therefore accessible economic and time effective tools to forecast groundwater level declines with acceptable uncertainty following dam removals are critical for public welfare and healthy regional economies. These tools are also vital to project planning and provide beneficial information for restoration and remediation managements. The standard tool for groundwater forecasting is 3D Numerical modeling. Artificial Neural Networks (ANNs) may be an alternative tool for groundwater forecasting pertain to dam removal. This project compared these two tools throughout the Milltown Dam removal in Western Montana over a five year period. It was determined that ANN modeling had equal or greater accuracy for groundwater forecasting with far less effort and cost involved.

Brown, L.; Berthelote, A. R.

2011-12-01

154

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

155

Dams on the Mekong: Cumulative sediment starvation  

NASA Astrophysics Data System (ADS)

Mekong River, largely undeveloped prior to 1990, is undergoing rapid dam construction. Seven dams are under construction on the mainstem in China and 133 proposed for the Lower Mekong River and tributaries. We delineated nine distinct geomorphic regions, for which we estimated sediment yields based on geomorphic characteristics, tectonic history, and the limited sediment transport data available. We then applied the 3W model to calculate cumulative sediment trapping by these dams, accounting for changing trap efficiency over time and multiple dams on a single river system. Under a "definite future" scenario of 38 dams (built or under construction), cumulative sediment reduction to the Delta would be 51%. Under full build-out of all planned dams, cumulative sediment trapping will be 96%. That is, once in-channel stored sediment is exhausted, only 4% of the predam sediment load would be expected to reach the Delta. This scenario would have profound consequences on productivity of the river and persistence of the Delta landform itself, and suggests that strategies to pass sediment through/around dams should be explored to prevent the consequences of downstream sediment starvation.

Kondolf, G. M.; Rubin, Z. K.; Minear, J. T.

2014-06-01

156

Concrete dam on the Bratsk hydroelectric station  

SciTech Connect

The Bratsk concrete dam was designed and constructed with a sufficient degree of reliability. Settlement of the dam together with the powerhouse developed uniformly under the entire foundation. Two irreversible processes causing aging of the dam have been established by operating observations: leaching of the concrete and decompression of the contact zone of the foundation near the upstream face of the powerhouse sections. The decompression is due to the fact that the powerhouse sections are lighter than the spillway sections. At the present level this process can only be slowed by the combined use of grouting and drainage unloading.

Solov'eva, Z.I.

1988-07-01

157

Channel Bed Mobility Downstream from the Elwha Dams, Washington  

Microsoft Academic Search

Dams are a major source of fragmentation and degradation of rivers. Although substantial research has been conducted on the environmental impacts of large structures in the United States, smaller dams have received less attention. This study evaluated the impact of two dams of moderate size, the Elwha Dams, on the downstream channel system using field data collection at river cross-sections.

Molly Pohl

2004-01-01

158

7. SOUTHEAST VIEW OF BIG DALTON DAM SHOWING THE MULTIPLE ...  

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

7. SOUTHEAST VIEW OF BIG DALTON DAM SHOWING THE MULTIPLE ARCHES, AN UPSTREAM VIEW OF THE PARAPET WALL ALONG THE CREST OF THE DAM, AND THE SHELTER HOUSE AT THE EAST END OF THE DAM. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

159

Implications of Dam Obstruction for Global Freshwater Fish Diversity  

Microsoft Academic Search

Dams are obstructing rivers worldwide, impairing habitat and migration opportunities for many freshwater fish species; however, global data linking dam and fish distributions have been limited. Here, we quantify dam obstruction at the biogeographic scale of freshwater ecoregion, which provides the spatial framework necessary to assess the risk of fish species loss due to dams and allows us to identify

Catherine Reidy Liermann; Christer Nilsson; James Robertson; Rebecca Y. Ng

2012-01-01

160

2. Overview of the Lost River Diversion Dam House complex ...  

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

2. Overview of the Lost River Diversion Dam House complex taken from west edge of horseshoe-shaped Lost River Diversion Dam. Interior of east side of dam in the foreground. Facing East. - Klamath Basin Project, Lost River Diversion Dam House, Lost River near intersection of State Highway 140 & Hill Road, Klamath Falls, Klamath County, OR

161

4. VIEW OF DOWNSTREAM FACE OF DAM, WITH SCARS FROM ...  

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

4. VIEW OF DOWNSTREAM FACE OF DAM, WITH SCARS FROM EARTH MOVING TO CONSTRUCT DAM IN FOREGROUND, LOOKING NORTHWEST - High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

162

Civil Engineering Explore the environmental impact of dams.  

E-print Network

Dams Civil Engineering Objective · Explore the environmental impact of dams. · Discuss the need for dams, and how environmental engineers mitigate some impacts. Standards and Objectives · Earth Systems humans' standard of living and environmental impacts. · The basic concept of constructing a dam

Provancher, William

163

9. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH ...  

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

9. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH MOVING TO CONSTRUCT DAM, LOOKING EAST - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

164

66. AVALON DAM Photographic copy of historic photo, May ...  

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

66. AVALON DAM - Photographic copy of historic photo, May 22, 1908 (original print filed in Record Group 115, National Archives, Washington, D.C.) W.J.Lubken, photographer 'VIEW LOOKING EAST FROM WEST END OF AVALON DAM, SHOWING DOWNSTREAM FACE OF DAM' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

165

53. AVALON DAM Photographic copy of historic photo, August ...  

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

53. AVALON DAM - Photographic copy of historic photo, August 9, 1893 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'EDDY DAM. LOOKING EAST.' VIEW OF COLLAPSED DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

166

6. DAM AFTERBAY, WITH OWYEE RIVER IN FOREGROUND, SHOWING OUTLET ...  

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

6. DAM AFTERBAY, WITH OWYEE RIVER IN FOREGROUND, SHOWING OUTLET TUNNEL PORTAL (LEFT) AND POWERHOUSE AND ENTRANCE PORTAL TO DAM INTERIOR (RIGHT). NOTE RELEASE OF WATER FROM NEEDLE VALVE NUMBER 2 IN VALVEHOUSE ON DAM. VIEW TO SOUTHEAST. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

167

43. Credit TR. Reconstruction of Dam No. 4 after 1936 ...  

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

43. Credit TR. Reconstruction of Dam No. 4 after 1936 flood. Pouring concrete for new dam section; opening at left for flume to remove water from behind coffer dam. Photo c. 1936 - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

168

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

169

8. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH ...  

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

8. VIEW OF BASIN BEHIND DAM, SHOWING SCARS FROM EARTH MOVING TO CONSTRUCT DAM, LOOKING NORTH - High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home, Duchesne County, UT

170

Physically based simulation of dam breach development for Tangjiashan Quake Dam, China  

Microsoft Academic Search

Physically based modeling approach has been widely developed in recent years for simulation of dam failure process resulting\\u000a from overtopping flow. Due to the lack of field data, there exist few applications to natural quake dams with complex erosion\\u000a mechanisms. This paper presents a physically based simulation of the failure process of the Tangjiashan Quake Dam formed as\\u000a a result

Fan Liu; Xudong Fu; Guangqian Wang; Jennifer Duan

171

Dams and Dam Failure - Module 1: Terminology and Open Channel Hydraulics  

NSDL National Science Digital Library

This is the first module of a two-part series offering an introduction to the science explaining catastrophic dam failure and flood-wave prediction methods associated with these events. Through use of rich illustrations, animations, and interactions, this module explains key terminology and concepts including dam types and purposes, failure statistics, the general dam failure process, open channel hydraulics, critical flow, Manning's equation, and conveyance. The information covered in this two module series will provide a scientific foundation for advanced course work needed to run dam break simulations and to conduct hydraulic modeling as a part of dynamic wave forecasting.

Comet

2008-03-19

172

EVOLVING EXPECTATIONS OF DAM REMOVAL OUTCOMES: DOWNSTREAM GEOMORPHIC EFFECTS FOLLOWING REMOVAL OF A SMALL, GRAVEL-FILLED DAM1  

E-print Network

EVOLVING EXPECTATIONS OF DAM REMOVAL OUTCOMES: DOWNSTREAM GEOMORPHIC EFFECTS FOLLOWING REMOVAL OF A SMALL, GRAVEL-FILLED DAM1 Kelly Kibler, Desiree Tullos, and Mathias Kondolf 2 ABSTRACT: Dam removal, it is necessary to utilize information from ongoing dam removal monitoring to evolve predictive tools, including

Tullos, Desiree

173

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

174

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

175

Toward Policies and Decision-Making for Dam Removal  

Microsoft Academic Search

Dam removal has emerged as a critical issue in environmental management. Agencies responsible for dams face a drastic increase\\u000a in the number of potential dam removals in the near future. Given limited resources, these agencies need to develop ways to\\u000a decide which dams should be removed and in what order. The underlying science of dam removal is relatively undeveloped and

MARTIN W. DOYLE; JON M. HARBOR; EMILY H. STANLEY

2003-01-01

176

Leibis/Lichte Dam in Germany  

NASA Astrophysics Data System (ADS)

In Thuringia the second highest dam of Germany is under construction (figure 1). The new Leibis/Lichte dam is a 370 m long and 102.5 m high gravity dam of concrete with straight axis. With the completion of the Leibis/Lichte dam in 2005 more than 300.000 inhabitants of the Eastern Regions of Thuringia will be supplied with high quality drinking water. The foundation rocks at the dam site are exclusively greyish-blue argillaceous schist, silt schist and cleaved fine sandstones from the Ordovician period (phycode schist). The main joint system consists of three differently orientated joints. Geomechanically of main interest is the shallow dipping bedding, especially in the left abutment because of its downhill dip. The other joints show a generally steep dip. Wide extending faults with thick mylonites or fractured zones, which could influence the foundation of the dam, do not exist within the dam site. The engineering geological field mapping of the foundation surface confirms the rock mass parameters. The excavation works are carried out in four different stages to avoid loosening of the foundation rock. Great care is taken to assure that the foundation rock is protected against weathering. Based on the results of preliminary investigations the foundation level was planned in a depth of 4 to14 m. The abutments of the dam correspond to the expectations. Predominantly the argillaceous rock shows a low permeability. The permeability is exclusively linked to faults respectively few large joints. In order to prevent seepage and to reduce the uplift pressure, a grout curtain in two rows is arranged with a depth of 5 to 44 metres.

Kühnel, Markus

177

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

178

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

179

DAMS, DAM REMOVAL, AND RIVER RESTORATION: A HEDONIC PROPERTY VALUE ANALYSIS  

Microsoft Academic Search

This article presents the results of a hedonic property value analysis for multiple hydropower sites along the Kennebec River in Maine, including the former site of the Edwards Dam in Augusta, Maine. The effect of the removal of the Edwards Dam on the Kennebec River in Maine is examined through consumer’s marginal willingness to pay to be close to or

LYNNE Y. LEWIS; CURTIS BOHLEN; SARAH WILSON

2008-01-01

180

Dam nation: A geographic census of American dams and their large-scale hydrologic impacts  

Microsoft Academic Search

Newly available data indicate that dams fragment the fluvial system of the continental United States and that their impact on river discharge is several times greater than impacts deemed likely as a result of global climate change. The 75,000 dams in the continental United States are capable of storing a volume of water almost equaling one year's mean runoff, but

William L. Graf

1999-01-01

181

Reservoir-triggered seismicity at the highest Brazillian dam  

NASA Astrophysics Data System (ADS)

Irapé Reservoir has the highest brazillian dam, with 208 meter high, and is located at Minas Gerais State, in the Jequitinhonha river. Since September 2003 a 3-component broadband digital seismic station is in opperation at the area and more three 3-component short period digital stations were installed nine months before the impoundment of the lake. During this two years pre-impoundment monitoring no local event was detected at the area of the lake. The filling of the reservoir started in December 7, 2005, and was followed by microearthquakes just one day after. Until October 2006 more than 300 events were detected by this local network. The largest microearthquake occurred in May 14, 2006 with 3.0 magnitude and was felt by the officials of the power plant. A preliminary hypocentral determination was performed for these events showing that the seismicity is located in a small area, with hypocenters below the lake or at its margins near the dam. The clear time correlation between the start of impoundment of the lake and the occurence of seismicity shows a causative relationship for these seismicity. Also the spatial distribution of the epicenters let us to conclude that this is another case of reservoir- triggered seismicity in Brazil of the rapid or initial response type.

Chimpliganond, C.; França, G. S.; Bandeira, A. E.; Bevilaqua, L. A.

2007-05-01

182

Hiwassee Dam rehabilitation to combat concrete growth  

SciTech Connect

Hiwassee Dam is experiencing concrete growth caused by alkali-aggregate reaction (AAR). The AAR is the alkali-silica tape associated with excessive alkali in the cement and a micaceous quartzite (siliceous) aggregate used in the concrete. Concrete growth at Hiwassee Dam caused by this reaction has resulted in high stresses and deflections within the dam. These stresses and deflections have caused the nonoverflow blocks to deflect into the spillway openings causing the spillway gates to bind. This growth has also caused the spillway bridge expansion joints to close, and structural cracking in the upper portion of the dam. This is a continuation of the paper that was presented at the International conference on Hydropower {open_quotes}WATERPOWER `93{close_quotes} entitled {open_quotes}MODIFICATION AT HIWASSEE DAM DUE TO CONCRETE GROWTH PROBLEMS{close_quotes} Volume 2, page 860 to 869. It presents: The rehabilitation to date, the instrumentation that has been installed to monitor the rehabilitation, and the results of these efforts.

Newell, V.A.; Tanner, D.T.; Wagner, C.D. [Tennessee Valley Authority, Chattanooga, TN (United States)

1995-12-31

183

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

184

Analysis of landslide dams induced by the 2008 Wenchuan earthquake  

NASA Astrophysics Data System (ADS)

Landslide dams caused by earthquakes are extremely hazardous disruptions of the flow of water and sediment in mountain rivers, capable of delivering large outburst floods that may devastate downstream areas. We analyzed a unique inventory of 828 landslide dams triggered by the Mw 7.9 2008 Wenchuan tectonic earthquake, China, constituting ˜1.4% of the >60,000 coseismic slope failures mapped and attributed to this event. While 501 landslides blocked the rivers completely, the remainder caused only partial damming or channel diversion. The spatial distribution of landslide dams follows the same trend of that of the total landslide distribution, with landslide dams being most abundant in the steep watersheds of the hanging wall of the Yingxiu-Beichuan Thrust Fault, and in the northeastern part of the strike-slip fault near Qingchuan. Besides the co-seismic landslide density, the river width also played a key role in determining the landslide dam formation. Narrow rivers are more prone to be dammed than the wide rivers. The correlation between river width and landslide dam volume follows a linear relation, which can be used to roughly estimate the dam formation possibility. However, the applicability of this correlation needs to be validated in other regions. The decay (failure) rate of dams, defined here as the percentage of the number and area of landslide dams that have failed over time, shows that ˜25% of dams accounting for ˜30% of total landslide dam area failed one week after the earthquake. These percentages increased to ˜60% within 1 month, and to >90% within 1 year. The geomorphometric parameters were analyzed, revealing power-law relations between landslide area and dam width, landslide source area and dam area, as well as lake area and lake volume. The inventory presented in this study will enrich the worldwide earthquake-induced landslide dam database and will also contribute to a better understanding of the post-earthquake dam decay.

Fan, Xuanmei; van Westen, Cees J.; Xu, Qiang; Gorum, Tolga; Dai, Fuchu

2012-09-01

185

DSM saves the dam. [Deep Soil Mix  

SciTech Connect

As US dams age and deteriorate, there is a growing need to upgrade them to meet new regulations and factors of safety. This article describes how, at Lockington Dam in Ohio's Miami Valley, construction of a deep-soil-mix soil-cement cutoff wall offered the best solution, both technically and economically, to prevent potential seepage-induced failure. Seventy-five years ago, the largest single constructing project in the US was the flood-control works of the Miami Conservancy District in Ohio. Begun in 1918 and completed in 1921 at a cost of $33 million, the project included five hydraulic-fill flood-control dams and 73 mi of levees constructed in response to 10 major floods, including a catastrophic 1913 flood in Dayton, that had caused more than 1,000 deaths and $100 million in damages over the previous century.

Walker, A.D. (Nicholson Construction, Bridgeville, PA (United States))

1994-12-01

186

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

187

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

188

Revised Final Independent External Peer Review Report for the East Branch Dam, Clarion River,  

E-print Network

Revised Final Independent External Peer Review Report for the East Branch Dam, Clarion River, Elk County, Pennsylvania: Dam Safety Modification Report Prepared by Battelle Memorial Institute Prepared Report East Branch Dam, Clarion River, Elk County, Pennsylvania: Dam Safety Modification Report

US Army Corps of Engineers

189

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

190

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

191

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

192

87. DAM TAINTER GATE OPERATING MACHINERY TRAVELING HOIST ...  

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

87. DAM - TAINTER GATE OPERATING MACHINERY - TRAVELING HOIST - AMERICAN TYPE ASSEMBLY (ML-5-55/111-FS), February 1938 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

193

View of powerhouse and dam from third floor of original ...  

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

View of powerhouse and dam from third floor of original section of Langdale Cotton Mill, looking northeast - Langdale Cotton Mill, Powerhouse & Dam, 5910 Nineteenth Avenue, Valley, Chambers County, AL

194

4. VIEW OF DAM, SHOWING TAINTER GATE PIERS, TAINTER GATE ...  

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

4. VIEW OF DAM, SHOWING TAINTER GATE PIERS, TAINTER GATE NO. 1 SERVICE BRIDGE, AND LOCOMOTIVE CRANE, LOOKING NORTHEAST (UPSTREAM) - Upper Mississippi River Nine-Foot Channel Project, Lock & Dam No. 25, Cap au Gris, Lincoln County, MO

195

5. VIEW OF DAM, SHOWING TAINTER GATE PIERS, TAINTER GATE ...  

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

5. VIEW OF DAM, SHOWING TAINTER GATE PIERS, TAINTER GATE NO. 1, AND SERVICE BRIDGE, LOOKING SOUTHEAST (DOWNSTREAM) - Upper Mississippi River Nine-Foot Channel Project, Lock & Dam No. 25, Cap au Gris, Lincoln County, MO

196

77. Plan of Proposed Concrete of Rubble Masonry Dam at ...  

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

77. Plan of Proposed Concrete of Rubble Masonry Dam at Frog Tanks on the Agua Fria River, Arizona. September 1903. - Waddell Dam, On Agua Fria River, 35 miles northwest of Phoenix, Phoenix, Maricopa County, AZ

197

5. DETAIL VIEW OF DAM, SHOWING ROLLER GATE HEADHOUSES, WITH ...  

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

5. DETAIL VIEW OF DAM, SHOWING ROLLER GATE HEADHOUSES, WITH AUXILIARY LOCK IN FOREGROUND, LOOKING NORTHEAST, UPSTREAM - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

198

25. VIEW OF MOVABLE CRANE ON DAM BRIDGE, WITH ROLLER ...  

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

25. VIEW OF MOVABLE CRANE ON DAM BRIDGE, WITH ROLLER GATE HEADHOUSE/PIERS IN BACKGROUND, LOOKING SOUTHEAST - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

199

86. DAM TAINTER GATE OPERATING MACHINERY HOIST CAR ...  

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

86. DAM - TAINTER GATE OPERATING MACHINERY - HOIST CAR NO. 2 - ELECTRIFICATION HOIST CLUTCH MODIFICATION (ML-5-55/6), March 1956 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN

200

6. VIEW NORTHEAST, WEST END OF DAM DURING CONSTRUCTION OF ...  

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

6. VIEW NORTHEAST, WEST END OF DAM DURING CONSTRUCTION OF FISHWAY, DECEMBER 1995, SHOWING REMOVAL OF PLANKING - Norwich Water Power Company, Dam, West bank of Shetucket River opposite Fourteenth Street, Greenville section, Norwich, New London County, CT

201

Seepage Chemistry Manual. Dam Safety Technology Development Program.  

National Technical Information Service (NTIS)

Gypsum, anhydrite, calcite, dolomite, and halite are soluble minerals that are common in the western United States where the Bureau of Reclamation has constructed many dams. Dams sited on foundations and abutments containing soluble minerals have the pote...

D. Craft

2005-01-01

202

1. CONTEXTUAL VIEW OF LITTLE FALLS DAM POWERPLANT AND NORTHWEST ...  

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

1. CONTEXTUAL VIEW OF LITTLE FALLS DAM POWERPLANT AND NORTHWEST END OF LITTLE FALLS TIE LINE. LOOKING WEST - Little Falls Tie Line Towers, Near Little Dam Falls on Spokane River, Wellpinit, Stevens County, WA

203

61. 'LITTLEROCK DAM LOOKING FROM LEFT TO RIGHT ABUTMENTSPILLWAY ...  

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

61. 'LITTLEROCK DAM - LOOKING FROM LEFT TO RIGHT ABUTMENT-SPILLWAY DISCHARGING.' No date; probably 1960s. Photographer unknown. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

204

1. VIEW SHOWING (LEFT TO RIGHT) DAM, PENSTOCK, SURGE TANKS ...  

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

1. VIEW SHOWING (LEFT TO RIGHT) DAM, PENSTOCK, SURGE TANKS AND POWERHOUSE, GREAT NORTHERN RAILWAY ROADBED (ABANDONED, CENTER), AND THE SIMILKAMEEN RIVER (LOWER FOREGROUND), LOOKING NORTHWEST - Enloe Dam, On Similkameen River, Oroville, Okanogan County, WA

205

20. VIEW OF ENLOE DAM (APPARENTLY COMPLETED), PENSTOCK UNDER CONSTRUCTION ...  

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

20. VIEW OF ENLOE DAM (APPARENTLY COMPLETED), PENSTOCK UNDER CONSTRUCTION (LEFT, CENTER), AND THE ORIGINAL POWERHOUSE (RIGHT, CENTER). LOOKING NORTH - Enloe Dam, On Similkameen River, Oroville, Okanogan County, WA

206

ORIGINAL ARTICLE Big dams and salmon evolution: changes in thermal  

E-print Network

salmon (Oncorhynchus tshawytscha). We estimated that dams on the Rogue River, the Willamette River (Oncorhynchus spp.) across portions of their natural range, dams have arguably played a major role in many

Angilletta, Michael

207

79. PALMDALE WATER COMPANY, LITTLEROCK DAM, EASTWOOD MULTIPLEARCHED TYPE: REINFORCEMENT, ...  

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

79. PALMDALE WATER COMPANY, LITTLEROCK DAM, EASTWOOD MULTIPLE-ARCHED TYPE: REINFORCEMENT, SHEET 6; OCTOBER 2, 1919. Littlerock Water District files. - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

208

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

209

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

210

12. VIEW SHOWING THE CLOSING OF THE GATES OF DAM ...  

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

12. VIEW SHOWING THE CLOSING OF THE GATES OF DAM 341 ON APRIL 15, 1936, THE DAY THEY BEGAN FLOODING THE MARSHES - J. Clark Salyer National Wildlife Refuge, Dam 341, Along Lower Souris River, Kramer, Bottineau County, ND

211

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

212

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

213

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

214

"No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing ...  

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

"No. 190. Grand Valley Diversion Dam. Diversion gates, water flowing into high line. June, 1917. R.B.D." - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

215

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

216

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

217

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

218

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

219

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

220

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

221

32. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO NORTH. ...  

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

32. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO NORTH. Photocopy of photograph by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, May 1981. - Boise Project, Boise River Diversion Dam, Across Boise River, Boise, Ada County, ID

222

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

223

9. VIEW OF DAM FROM LEFT SIDE. PUMPCRETE PIPE LINES ...  

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

9. VIEW OF DAM FROM LEFT SIDE. PUMPCRETE PIPE LINES ARE CARRIED ON WALKWAY. UPSTREAM PARTS OF BUTTRESSES ARE FOG-SPRAYED TO PERMIT PROMPT FILLING OF CONTRACTION JOINTS. July 30, 1938 - Bartlett Dam, Verde River, Phoenix, Maricopa County, AZ

224

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

225

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

226

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

227

3. Down river view of lock and dam to southwest ...  

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

3. Down river view of lock and dam to southwest - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

228

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

229

Evaluation of the dynamic response of the Damlapinar CFR dam  

Microsoft Academic Search

Concrete faced rock-fill (CFR) dams are now very popular. The structural complexity of these dams and the high risk associated\\u000a with the social and environmental consequences of failures require very reliable analyses of their performance, especially\\u000a as regards seismic loading. In this paper, a dynamic analysis procedure for CFR dams is proposed and described, using the\\u000a Damlap?nar CFR dam as

Niyazi U. Terzi

2011-01-01

230

Seismic performance analysis of Tendaho earth fill dam, Ethiopia.  

NASA Astrophysics Data System (ADS)

The Tendaho dam is found in the Afar regional state, North Eastern part of Ethiopia. It is located within an area known as the ‘Tendaho Graben' ,which forms the center of Afar triangle, a low lying area of land where East African, Red sea and the Gulf of Eden Rift systems converge. The dam is an earthfill dam with a volume of about 4 Million cubic meters and with mixed clay core. The geological setting associated with the site of the dam, the geotechnical properties of the dam materials and seismicity of the region are reviewed. Based on this review, the foundation materials and dam body include some liquefiable granular soils. Moreover, the active East African Rift Valley fault, which can generate an earthquake of magnitude greater than 6, passes through the dam body. This valley is the primary seismic source contributing to the hazard at the Tendaho dam site. The availability of liquefiable materials beneath and within the dam body and the presence of the active fault crossing the dam site demand a thorough seismic analysis of the dam. The peak ground acceleration (PGA) is selected as a measure of ground motion severity. The PGA was selected according to the guidelines of the International Commission on Large Dams, ICOLD. Based on the criteria set by the ICOLD, the dam is analyzed for two different earthquake magnitudes, the Maximum Credible Earthquake (MCE) and the Operating Basis Earthquake (OBE). Numerical codes are useful tools to investigate the safety of dams in seismic prone areas. In this paper, FLAC3D numerical tool is used to investigate the performance of the dam under dynamic loading. Based on the numerical analysis, the seismic performance of the dam is investigated.

Berhe, T.; Wu, W.

2009-04-01

231

"No. 172. General view of the dam, looking downstream from ...  

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

"No. 172. General view of the dam, looking downstream from the east end. F.E.D. June, 1916." Compare this historic image, taken upon dam completion (1916), with current-condition photograph HAER CO-90-1. The dam retains a remarkable degree of integrity of design and setting - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

232

Student Competition: Siting Potential Dams at Camp Del Webb, Utah  

E-print Network

Siting Potential Dams at Camp Del Webb, Utah Presented By: Kyle Wamser Problem ? Camp Del Webb is Lacking an Onsite Lake ? High Adventure Bases generally need aquatics ? Large lake nearby, but transportation is required ? Possible Solution... hillshade ? Finding Possible Lake Locations ? Added three potential dam sites ? Calculated watersheds ? Extended dams through terrain to prevent runoff on the sides ? Calculated watershed dam elevation, which identified lakes Results...

Wamser, William Kyle

2007-11-14

233

33 CFR 100.1102 - Marine Events on the Colorado River, between Davis Dam (Bullhead City, Arizona) and Headgate Dam...  

Code of Federal Regulations, 2010 CFR

... false Marine Events on the Colorado River, between Davis Dam (Bullhead City...1102 Marine Events on the Colorado River, between Davis Dam (Bullhead City...Lake Moovalya, Parker, Arizona between river miles 179 and 185 (between the...

2010-07-01

234

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

Code of Federal Regulations, 2010 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...

2010-07-01

235

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

236

Out, Out, Dam Spot: The Geomorphic Response of Rivers to Dam Removal. Science Findings, Issue Seventy One, March 2005.  

National Technical Information Service (NTIS)

About 75,000 irrigation, flood control, and hydropower dams in the United States are aging, deteriorating, or have outlived their useful lives and purposes. Not surprisingly, dam removal is emerging as both a challenge and opportunity for river management...

2005-01-01

237

Seismic performance analysis of Tendaho earth fill dam, Ethiopia  

Microsoft Academic Search

The Tendaho dam is found in the Afar regional state, North Eastern part of Ethiopia. It is located within an area known as the `Tendaho Graben' ,which forms the center of Afar triangle, a low lying area of land where East African, Red sea and the Gulf of Eden Rift systems converge. The dam is an earthfill dam with a

T. Berhe; W. Wu

2009-01-01

238

REVIEW PLAN John Redmond Dam Reservoir, Coffee County, Kansas  

E-print Network

#12;#12;REVIEW PLAN John Redmond Dam Reservoir, Coffee County, Kansas Reallocation Study Tulsa PLAN John Redmond Dam Reservoir, Coffee County, Kansas Reallocation Study Tulsa District TABLE review for the Final Reallocation Report to the John Redmond Dam and Reservoir, Coffee County, Kansas

US Army Corps of Engineers

239

55. AVALON DAM (Photographic copy of photo in Reservoirs ...  

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

55. AVALON DAM - (Photographic copy of photo in Reservoirs for Irrigation, Water-Power, and Domestic Water Supply. New York: John Wiley & Sons, 1902.) 'CANAL HEADGATES, LAKE AVALON DAM' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

240

Flood Control Reservoirs Operable September 30, 2008 Characteristics of Dam  

E-print Network

APPENDIX A Flood Control Reservoirs Operable September 30, 2008 A-1 Characteristics of Dam Name A Flood Control Reservoirs Operable September 30, 2008 A-2 Characteristics of Dam Name River Basin Stream Reservoirs Operable September 30, 2008 A-3 Characteristics of Dam Name River Basin Stream Community

US Army Corps of Engineers

241

Flood Control Reservoirs Operable September 30, 2009 Characteristics of Dam  

E-print Network

APPENDIX A Flood Control Reservoirs Operable September 30, 2009 A-1 Characteristics of Dam Name A Flood Control Reservoirs Operable September 30, 2009 A-2 Characteristics of Dam Name River Basin Stream Reservoirs Operable September 30, 2009 A-3 Characteristics of Dam Name River Basin Stream Community

US Army Corps of Engineers

242

Flood Control Reservoirs Operable September 30, 2007 Characteristics of Dam  

E-print Network

APPENDIX A Flood Control Reservoirs Operable September 30, 2007 A-1 Characteristics of Dam Name Creek Superior 960 34,500 NPP F Earth 25 978 ARKANSAS Blakely Mountain Ouachita Dam Ouachita Hot Springs,554 Narrows Dam Ouachita Little Missouri Murfreesboro 1949 407,900 2,500 FP Concrete 175 941 Nimrod Arkansas

US Army Corps of Engineers

243

LOOKING DOWNSTREAM FROM KACHESS DAM CREST, 1910 RIVER CUTOFF CHANNEL ...  

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

LOOKING DOWNSTREAM FROM KACHESS DAM CREST, 1910 RIVER CUTOFF CHANNEL WITH CRIB STRUCTURE IN CENTER. BRIDGE FOOTING CRIB STRUCTURE AT RIGHT (Upstream face of Kachess Dam in foreground) - Kachess Dam, Cutoff Channel and Crib Structures, Kachess River, 1.5 miles north of Interstate 90, Easton, Kittitas County, WA

244

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

245

The Geomorphic Response of Gravel-bed Rivers to Dams  

E-print Network

15.1 INTRODUCTION Dams and reservoirs represent the single most profound human alteration of the fluvial system. In almost all cases, dams interrupt and modify the downstream flux of sediment through controls of channel form ­ sediment and water ­ dams have the potential to alter the entire hierarchy

246

Regulated expression of the Escherichia coli dam gene.  

PubMed

Regulated expression of the Escherichia coli dam gene has been achieved with the araBAD promoter lacking a ribosome binding site. Cultures of dam mutants containing plasmid pMQ430 show no detectable methylation in the absence of arabinose and complete methylation in its presence. Dam methyltransferase is a substrate for the Lon protease. PMID:12897023

Calmann, Melissa A; Marinus, M G

2003-08-01

247

Regulated Expression of the Escherichia coli dam Gene  

Microsoft Academic Search

Regulated expression of the Escherichia coli dam gene has been achieved with the araBAD promoter lacking a ribosome binding site. Cultures of dam mutants containing plasmid pMQ430 show no detectable methylation in the absence of arabinose and complete methylation in its presence. Dam methyltransferase is a substrate for the Lon protease.

Melissa A. Calmann; M. G. Marinus

2003-01-01

248

Yangtze Sediment Decline Partly From Three Gorges Dam  

Microsoft Academic Search

It could be argued that nowhere has the impact of dams on rivers been more important of dams on rivers than in China, where since 1950 almost half of the world's large dams (higher than 15 meters) have been built [Fuggle and Smith, 2000]. China's Yangtze River (Changjiang)-the largest river in south Asia (1.8 million square kilometers) and whose basin

Kehui Xu; John D. Milliman; Zuosheng Yang; Houjie Wang

2006-01-01

249

Bed Sediment Monitoring of Multiple Contiguous Small Dam Removals  

Microsoft Academic Search

Dam removal is crucial for reconnecting river habitats, restoring passage of fish and other aquatic organisms, and restoring the free flow of water and sediment. However, removal of obsolete dams is often resisted due to concerns of releasing sediment and initiating channel instability. Two dams on the Musconetcong River in northern New Jersey have been removed as part of a

J. C. Galster; J. R. Wyrick

2010-01-01

250

Effective dam removal and river channel restoration approaches  

Microsoft Academic Search

Millions of dams have been built on the planet's rivers and streams to provide societal needs for freshwater supplies, irrigation, hydroelectric development, industrial activities and flood control. The structural and operational components of most dams include features that reflect technological advancements and changing societal priorities over time. Many dams were constructed and operated with no consideration for river ecology; some

C. Katopodis; L. P. Aadland

2006-01-01

251

29. At Willard, Little Salmon Creek. Site of former dam ...  

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

29. At Willard, Little Salmon Creek. Site of former dam and water supply pond for Broughton flume. View from downstream of intake, dam wind wall to right, lower wall of overflow chute in left foreground (contains pipes and small dam, possibly for water pumping). West 320 degrees. - Broughton Flume, Hood River Junction on Columbia River at Washington/Oregon border, Hood, Skamania County, WA

252

6. VIEW SHOWING CREST OF DAM AND OUTLET GATE WHEEL, ...  

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

6. VIEW SHOWING CREST OF DAM AND OUTLET GATE WHEEL, STEM AND STEM GUIDE, LOOKING SOUTHEAST - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

253

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

254

Treatment for a fully weathered rock dam foundation  

Microsoft Academic Search

The main dam at the upper reservoir of Tianhuanping pumped storage power station is a rockfill dam with an asphalt concrete impervious lining on the upstream face. It is constructed on a non-homogeneous fully weathered rock foundation. In this paper, we present the case study on the treatment for this non-homogeneous fully weathered rock dam foundation. The treatment includes the

Y. S. Wang; S. H. Liu

2005-01-01

255

PVC waterproofing membranes and alkali-aggregated reaction in dams  

SciTech Connect

A waterproofing polyvinylchloride (PVC) based geocomposite was installed on two dams subject to alkali-aggregate reaction, to eliminate water intrusion and to protect the facing from further deterioration. The installation system allows drainage of the infiltrated water, thus accomplishing dehydration of the dam body. On one dam, the membrane also provided protection for future slot cutting.

Scuero, A.M. [C.A.R.P.I. Technologies SA, Lugano (Czech Republic)

1995-12-31

256

3. NORTHEAST VIEW OF BIG TUJUNGA DAM SHOWING THE RIGHT ...  

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

3. NORTHEAST VIEW OF BIG TUJUNGA DAM SHOWING THE RIGHT ABUTMENT WITH THE SPILLWAY AND THE BRIDGE IN THE BACKGROUND. PHOTO TAKEN NEAR THE PARKING AREA SOUTH OF THE DAM. - Big Tujunga Dam, 809 West Big Tujunga Road, Sunland, Los Angeles County, CA

257

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

258

DESCHUTES PROJECT, OREGON, WICKIUP DAM, LOOKING NORTH FROM RIGHT ABUTMENT. ...  

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

DESCHUTES PROJECT, OREGON, WICKIUP DAM, LOOKING NORTH FROM RIGHT ABUTMENT. BUREAU MAINTENANCE BUILDINGS LOCATED BELOW THE DAM WITH ROUND MOUNTAIN BEYOND. SHOW COVERED CULTUS MOUNTAIN TO THE LEFT. Photocopy of historic photographs (original photograph on file at National Archives, Rocky Mountain Region, Denver, CO). R.A. Baker, Photographer, April 25, 1950 - Wickiup Dam, Deschutes River, La Pine, Deschutes County, OR

259

7. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, WITH ...  

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

7. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, WITH OUTLET CULVERT AND WING RETAINING WALLS, LOOKING NORTH - High Mountain Dams in Upalco Unit, Twin Pots Dam, Ashley National Forest, 10.1 miles North of Mountain Home, Mountain Home, Duchesne County, UT

260

Geologic Hazards Associated With a Proposed Dam on the Yarlung-  

E-print Network

-Gyala antiform. Active faults drawn in black. Approximate location of the dam and diversion tunnel proposedGeologic Hazards Associated With a Proposed Dam on the Yarlung- Tsangpo River in SE Tibet Peter K of data relevant to dam siting. Figure 8. Fission-track data from detrital zircons obtained from sands

Kidd, William S. F.

261

2. Upstream face of Rock Creek Diversion Dam, looking east ...  

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

2. Upstream face of Rock Creek Diversion Dam, looking east (Canal slide gates to left, Rock Creek diversion gate to right in raised position) - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

262

Three-Gorges Dam: Risk to Ancient Fish  

E-print Network

Three-Gorges Dam: Risk to Ancient Fish THE HUGETHREE-GORGES DAM (TGD) OFTHE Yangtze River is going and animals, as discussed by J. Wu et al. in their Policy Forum "Three-Gorges Dam-- experiment in habitat vulnerable. The Yangtze River basin is one of the richest areas in freshwater fish species diversity

Wu, Jianguo "Jingle"

263

Effects of Beaver Dams on Subarctic Wetland Hydrology  

Microsoft Academic Search

Beaver dams are ubiquitous in subarctic wetlands, where runoff in the flat terrain is highly prone to changes as the stream courses are modified by beaver activities. Depending on the state of preservation, stream flow can overtop or funnel through gaps in the dams, leak from the bottom of the dams or seep through the entire structure. Peak and low

MING-KO WOO; JAMES M. WADDINGTON

1990-01-01

264

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

265

DRAFT San Acacia Reach San Acacia Dam to Escondida Bridge  

E-print Network

by Reclamation on the San Acacia reach. The 11.6 mile long extends from the San Acacia Diversion dam (River Mile and the construction of the diversion dam. Due to the degradation, the particle diameter has coarsened from a 0.1 mmDRAFT San Acacia Reach San Acacia Dam to Escondida Bridge Hydraulic Modeling Analysis 1918

Julien, Pierre Y.

266

1. Upstream face of Rock Creek Diversion Dam, looking east ...  

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

1. Upstream face of Rock Creek Diversion Dam, looking east (Overflow weir right, diversion section into Irrigation District Canal to left) - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

267

4. Downstream face of Rock Creek Diversion Dam, looking west ...  

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

4. Downstream face of Rock Creek Diversion Dam, looking west (Irrigation District canal to right, creek gate and weir to left) - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

268

San Acacia Reach San Acacia Dam to Escondida Bridge  

E-print Network

by Reclamation on the San Acacia reach. The 11.6 mile long reach extends from the San Acacia Diversion dam (River and the construction of the diversion dam. Due to the degradation, the particle diameter has coarsened from about 0San Acacia Reach San Acacia Dam to Escondida Bridge Hydraulic Modeling Analysis 1918-2006 Middle

Julien, Pierre Y.

269

1. Overview of the Lost River Diversion Dam House complex, ...  

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

1. Overview of the Lost River Diversion Dam House complex, showing house, workshop, and landscaping. Portions of the Lost River Diversion Dam visible to left, background of the house. Facing northwest. - Klamath Basin Project, Lost River Diversion Dam House, Lost River near intersection of State Highway 140 & Hill Road, Klamath Falls, Klamath County, OR

270

6. Downstream face of Rock Creek Diversion Dam, looking west ...  

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

6. Downstream face of Rock Creek Diversion Dam, looking west (Gate raised to cut off flow to Rock Creek, weir section to left of photo) - Bitter Root Irrigation Project, Rock Creek Diversion Dam, One mile east of Como Dam, west of U.S. Highway 93, Darby, Ravalli County, MT

271

28. Photocopied August 1978. UPPER INTAKE COFFER DAM, OCTOBER 7, ...  

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

28. Photocopied August 1978. UPPER INTAKE COFFER DAM, OCTOBER 7, 1901. LOGS WERE PLACED ON THE WATER SIDE OF THIS DAM TO COUNTERACT WAVE ACTION AGAINST THE DAM. NOTE THE TIMBER RETAINING WALL ON THE NORTH SIDE OF THE LOWER INTAKE. (185) - Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie, Chippewa County, MI

272

INCORPORATING UNCERTAINTY INTO DAM SAFETY RISK Sanjay S. Chauhan1  

E-print Network

INCORPORATING UNCERTAINTY INTO DAM SAFETY RISK ASSESSMENT Sanjay S. Chauhan1 and David S. Bowles2 ABSTRACT Risk assessment is becoming more widely used to supplement traditional approaches to dam safety decision-making. Dam owners throughout Australia, the U.S. Army Corps of Engineers, and the U.S. Bureau

Chauhan, Sanjay S.

273

THREE GORGES DAM Matthew Morioka, Alireza Abrishamkar, Yve Kay  

E-print Network

THREE GORGES DAM Matthew Morioka, Alireza Abrishamkar, Yve Kay CEE 491 #12;Specifications.3 Billion · Total Cost (2008) ¥ 148.4 Billion = $ 21.8 Billion #12;Source of Funds · Three Gorges Dam Construction Fund · Profits from the Gezhouba Dam · Policy Loans from the Chinese Development Bank · Loans from

Prevedouros, Panos D.

274

Dam-Breach Flood Wave Propagation Using Dimensionless Parameters  

E-print Network

Dam-Breach Flood Wave Propagation Using Dimensionless Parameters Victor M. Ponce, M.ASCE1 ; Ahmad to study the sensitivity of dam-breach flood waves to breach-outflow hydrograph volume, peak discharge the channel. A dam-breach Froude number is defined to enable analysis through a wide range of site and flow

Ponce, V. Miguel

275

FLOOD WARNING SYSTEM BRISBANE RIVER BELOW WIVENHOE DAM  

E-print Network

FLOOD WARNING SYSTEM for the BRISBANE RIVER BELOW WIVENHOE DAM TO BRISBANE CITY This brochure for the Brisbane River below Wivenhoe Dam to Brisbane City. It includes reference information which will be useful kilometres of which about half is below Wivenhoe Dam. The Lockyer-Laidley Valley drains into the Brisbane

Greenslade, Diana

276

Executive Summary The Report of the World Commission on Dams  

E-print Network

xxvii Executive Summary The Report of the World Commission on Dams Executive Summary The global debate about large dams is at once overwhelmingly complex and fundamentally simple. It is complex because the issues are not confined to the design, construction and operation of dams themselves but embrace

Kammen, Daniel M.

277

43 CFR 418.18 - Diversions at Derby Dam.  

...2014-10-01 false Diversions at Derby Dam. 418.18 Section 418.18 Public Lands...Management § 418.18 Diversions at Derby Dam. (a) Diversions of Truckee River water at Derby Dam must be managed to maintain minimum...

2014-10-01

278

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

279

25 CFR 173.16 - Reserved area, Coolidge Dam.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

2010-04-01

280

25 CFR 173.16 - Reserved area, Coolidge Dam.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

2011-04-01

281

25 CFR 173.16 - Reserved area, Coolidge Dam.  

Code of Federal Regulations, 2012 CFR

...2011-04-01 true Reserved area, Coolidge Dam. 173.16 Section 173.16 Indians... § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business...of a mile from the center of the Coolidge Dam,...

2012-04-01

282

FLOOD WARNING SYSTEM BRISBANE RIVER ABOVE WIVENHOE DAM  

E-print Network

FLOOD WARNING SYSTEM for the BRISBANE RIVER ABOVE WIVENHOE DAM This brochure describes the flood above Wivenhoe Dam. It includes reference information which will be useful for understanding Flood above Wivenhoe Dam drains an area of approximately 7,000 square kilometres. The Brisbane River rises

Greenslade, Diana

283

A review of proposed Glen Canyon Dam interim operating criteria  

Microsoft Academic Search

Three sets of interim operating criteria for Glen Canyon Dam on the Colorado River have been proposed for the period of November 1991, to the completion of the record of decision for the Glen Canyon Dam environmental impact statement (about 1993). These criteria set specific limits on dam releases, including maximum and minimum flows, up-ramp and down-ramp rates, and maximum

K. LaGory; I. Hlohowskyj; D. Tomasko; J. Hayse; L. Durham

1992-01-01

284

A Deep Soil Mix Cutoff Wall At Lockington Dam, Ohio  

Microsoft Academic Search

The Miami Conservancy District built five flood control dams after the catastrophic flood of 1913 in Dayton, Ohio. Lockington Dam was one of these five hydraulic fill structures. The Ohio State Department of Natural Resources (ODNR) issued new regulations in 1981 requiring that design flood for class I dams be considered equal to the Probable Maximum Flood (PMF). Flood routing

Andrew D. Walker

1994-01-01

285

DEEP SOIL MIXING AT THE JACKSON LAKE DAM  

Microsoft Academic Search

The Jackson Lake Dam was constructed in 1917 in the Grand Teton National Park near Jackson, Wyoming. The dam was a hydraulic fill placed on a natural alluvium and outwash foundation. The Bureau of Reclamation (Burec) determined that the dam and its foundation would be susceptible to liquefaction and failure during a potential earthquake; a series of contracts was let

Christopher R. Ryan; Brian H. Jasperse

286

Dams and Dam Failure - Module 2: St. Venant Equations, Modeling, and Case Study  

NSDL National Science Digital Library

This second module in the two-part series expands on the science explaining catastrophic dam failure and flood-wave prediction methods associated with these events. Through the use of rich illustrations and interactions, this module introduces the St. Venant equations for dynamic wave flow, and flood wave characteristics. It also explains the general dam failure modeling process along with advantages and limitations of dam failure models including model stability, accuracy, and sensitivity issues. Finally, it also provides an overview of the Teton River dam failure, one of the most famous hydrologic events in U.S. history. The two modules that comprise this series are designed to be taken consecutively and together provide a fundamental understanding of this complex hydrologic topic.

Comet

2008-08-25

287

Facilitating fish passage at ultra low head dams: An alternative to dam removal  

USGS Publications Warehouse

Ecosystem sustainability and returning the biological integrity to rivers continue to change the landscape of fish passage technology. Installing a conventional fishways has a limited degree of success in accommodating fish passage needs. Recently, the option of total dam removal has been gaining momentum among resource managers, conservationists, and even engineers. Certain dams, however, cannot be removed, and conventional fishways are either too expensive to build or the real estate is simply not available; yet freedom of passage must be attained. At the Little Falls Dam on the Potomac River a notch in the crest of the dam was installed to accommodate passage of fish. The notch has three labyrinth weirs used for energy dissipation. Water velocities are maintained at less than about 4 m/s anywhere within the passage structure during migratory season of the target species (American shad). Construction of this novel design was recently completed (March 2000) and future biological evaluations are ongoing. Copyright ASCE 2004.

Odeh, M.

2004-01-01

288

The evolution of gravel bed channels after dam removal: Case study of the Anaconda and Union City Dam removals  

Microsoft Academic Search

The Anaconda and Union City Dams on the Naugatuck River in Connecticut were removed in February and October 1999. A detailed study of the sites prior to removal was undertaken including sediment testing and predictions of upstream channel formation post-dam removal. The 3.35-m-high timber crib\\/rock fill spillway of the Anaconda Dam partially breached during a storm prior to the dam's

Laura A. S. Wildman; James G. MacBroom

2005-01-01

289

White Oak Dam stability analysis. Volume I  

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

290

Dam water quality study. Report to Congress  

SciTech Connect

The objective of the report is to identify water quality effects attributable to the impoundment of water by dams as required by Section 524 of the Water Quality Act of 1987. The document presents a study of water quality effects associated with impoundments in the U.S.A.

Not Available

1989-05-01

291

Turbine venting at Clarks Hill Dam  

Microsoft Academic Search

Like most deep water bodies, Clarks Hill Lake undergoes thermal stratification during the summer and early fall resulting in a relatively cold, oxygen depleted bottom layer of water termed the hypolimnion. The turbine intakes are located far below the surface in this hypolimnion; therefore, it is this lower layer of water that is released from the dam year-round, and during

Mauldin

1982-01-01

292

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

293

Will We. . .? Thai Dam Resource Book.  

ERIC Educational Resources Information Center

This resource book is intended as an aid to persons working with Thai Dam refugees. To help the language teacher, some differences between Lao and English are discussed, specifically tonal inflections, positioning, declension of pronouns, conjugation of verbs, interrogatives, classifiers and predicate adjectives. An outline of cultural differences…

Murphy, Richard, Ed.; And Others

294

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.

295

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. PMID:23844387

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

2013-01-01

296

US Society on Dams Annual Conference, March 2007, Philadelphia, Pennsylvania TOLERABLE RISK FOR DAMS: HOW SAFE IS SAFE ENOUGH?  

E-print Network

US Society on Dams Annual Conference, March 2007, Philadelphia, Pennsylvania 1 TOLERABLE RISK FOR DAMS: HOW SAFE IS SAFE ENOUGH? David S. Bowles 1 To grapple with this topic requires that we cross the boundary from the technical world of dam safety engineering into the far more subjective world of values

Bowles, David S.

297

Evaluating Dam Safety Retrofits With Uncertain Benefits: The Case of Mohawk Dam (Walhonding River, Ohio)  

NASA Astrophysics Data System (ADS)

Mohawk Dam, part of the Muskingum basin flood control system, was built in 1938 and is operated by the U.S. Army Corps of Engineers (Corps). Since this high-hazard dam could not survive a probable maximum flood (PMF), the Corps conducted a study to determine the least expensive means of enabling the dam to survive a PMF. Applying a previously proposed framework to select the social cost minimizing capacity of a dam, we show that Mohawk Dam had sufficient capacity that any retrofit has a social cost larger than expected benefits. Sensitivity analyses were performed adjusting the peak flow distribution, the costs of modification, and downstream flood damage, as well as the possibility of loss of life. For any reasonable value of these variables the conclusion does not change that the structure already met so high a safety goal regarding extreme floods that no retrofit is needed. Using risk-based methods to perform reservoir safety evaluations, as recommended by a National Research Council committee in 1985, is indeed feasible. Furthermore, their use provides valuable insight and guidance into the selection of strategies to enhance the safety of dams.

Resendiz-Carrillo, Daniel; Lave, Lester B.

1990-05-01

298

Flood - Volume Analysis and Efficiency of The Dam Spillways  

NASA Astrophysics Data System (ADS)

Past experience and statistical data show that extreme floods constitute an important risk for the hydrological safety of dams. Overtopping represents more than 40% of dam failures in the world, and has been also cause of many other accidents. For this reason, the problem of selecting the appropriate design flood is a constant concern to dam engineering. This concern is even more important for those dams that are also explicitly committed to flood control target. In the present talk we investigate the hydrological safety of dams checking the efficiency of the dam spillways. A new statistical procedure based on the flood-volume analysis is developed. An application to Ceppo Morelli dam, on Anza river basin, in Piedmont, Italy, is given.

Canossi, M.; de Michele, C.; Petaccia, A.; Rosso, R.

299

Nile River, Lake Nasser, Aswan Dam, Egypt  

NASA Technical Reports Server (NTRS)

Egypt's High Aswan Dam on the Nile River at the first cataracts, Nile River, (24.0N, 33.0E) was completed in 1971 to provide cheap hydroelectric power and to regulate the historically uneven flow of the Nile River. The contrast between the largely base rock desert east of the Nile versus the sand covered desert west of the river and the ancient irrigated floodplain downstream from the damsite is clearly shown.

1991-01-01

300

Between a dam and a hard spot  

Microsoft Academic Search

On 1\\/27\\/78, an ice gorge in the Ohio River broke and swept down on 13 towboats and 125 barges (many carrying petrochemicals, e.g., xylene and gasoline) waiting at the icebound Markland Locks and Dam, 60 mi south of Cincinnati. During salvage operations on 2\\/5\\/78, a 108 ft wide, 1000 ft long gasoline tow became wedged solid in the lock chamber

1979-01-01

301

Evaluating the behavior of dams during earthquakes  

SciTech Connect

The severe earthquake that killed dozens of people and resulted in billions of dollars in economic loss in southern California in January 1994 provides a sobering reminder of the potential damage such events can cause... and the need to ensure that structures can withstand them. A team of California-based researchers is working on a program to give dam owners better tools for understanding their structures` response to earthquakes.

Duron, Z.H.; Aagaard, B.; Fischer, B. [Harvey Mudd College, Clarement, CA (United States)] [and others

1994-04-01

302

Sediment removal at a diversion dam  

SciTech Connect

The Central Nebraska Public Power and Irrigation District has been involved in sediment removal at their Diversion Dam on the Platte River, Lincoln County, Nebraska for 44 years. This paper summarizes methods that have been utilized, both successful and unsuccessful. The conclusion demonstrates how the District cooperated with various state agencies to alleviate water quality and sediment build-up concerns in obtaining a five-year dredging permit from the Army Corp of Engineers.

Boyd, K.M. [Central Nebraska Public Power and Irrigation District, Gothenburg, NE (United States)

1995-12-31

303

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

304

Hydrodynamic pressure on arch dam and gravity dam including absorption effect of reservoir sediments  

NASA Astrophysics Data System (ADS)

Based on the scaled boundary finite element method (SBFEM), a procedure is developed for evaluation of hydrodynamic pressure acting on arch/gravity dam face. The effect of water compressibility and the absorption of reservoir bottom and sides are taken into consideration. Various factors that affect the earthquake induced hydrodynamic pressure are examined. Emphasis is placed on the influence of reservoir geometry on the magnitude and distribution of hydrodynamic pressure on arch/gravity dam face. Numerical examples demonstrate that SBFEM is a powerful numerical method dealing with hydrodynamic problems. It is computationally quite economical. The effects of water compressibility, reservoir boundary absorption as well as reservoir geometry can be considered with relative ease. Results also show that reservoir geometry affects the amplitude and distribution of hydrodynamic pressure acting on arch/gravity dam face considerably.

Lin, Gao; Wang, Yi; Hu, Zhiqiang

2010-06-01

305

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

306

Shock wave propagation of circular dam break problems  

NASA Astrophysics Data System (ADS)

We examine the behavior of shock wave propagation of circular (radial) dam break problems. A dam break problem represents a reservoir having two sides of water at rest initially with different depth separated by a wall, then water flows after the wall is removed. The behavior of shock wave propagation is investigated with respect to water levels and with respect to the speeds of the shock waves. To the author's knowledge, such investigation for circular dam break problems had never been done before. Therefore, this new work shall be important for applied computational mathematics and physics communities as well as fluid dynamic researchers. Based on our research results, the propagation speed of shock wave in a circular dam break is lower than that of shock wave in a planar dam break having the same initial water levels as in the circular dam break.

Mungkasi, Sudi

2014-10-01

307

Hydrologic and Hydraulic Factors Affecting Passage of Paddlefish through Dams in the Upper Mississippi River  

Microsoft Academic Search

Populations of paddlefish Polyodon spathula have been adversely affected by dams that can block their movements. Unlike high-head dams that preclude fish passage (unless they are equipped with fishways), the dams on the upper Mississippi River are typically low-head dams with bottom release gates that may allow fish passage under certain conditions. We evaluated the relation of dam head and

Steven J. Zigler; Michael R. Dewey; Brent C. Knights; Ann L. Runstrom; Mark T. Steingraeber

2004-01-01

308

Examining the economic impacts of hydropower dams on property values using GIS  

Microsoft Academic Search

While the era of dam building is largely over in the United States, globally dams are still being proposed and constructed. The articles in this special issue consider many aspects and impacts of dams around the world. This paper examines dam removal and the measurement of the impacts of dams on local community property values. Valuable lessons may be found.

Curtis Bohlen; Lynne Y. Lewis

2008-01-01

309

Dam Removal Express Assessment Models (DREAM). Part 1: Model development and validation  

Microsoft Academic Search

Many dams have been removed in the recent decades in the U.S. for reasons including economics, safety, and ecological rehabilitation. More dams are under consideration for removal; some of them are medium to large-sized dams filled with millions of cubic meters of sediment. Reaching a decision to remove a dam and deciding as how the dam should be removed, however,

YANTAO CUI; Hydraulic Engineer; GARY PARKER; CHRISTIAN BRAUDRICK; WILLIAM E. DIETRICH; BRIAN CLUER

310

Examining the economic impacts of hydropower dams on property values using GIS  

Microsoft Academic Search

While the era of dam building is largely over in the United States, globally dams are still being proposed and constructed. The articles in this special issue consider many aspects and impacts of dams around the world. This paper examines dam removal and the measurement of the impacts of dams on local community property values. Valuable lessons may be found.In

Curtis Bohlen; Lynne Y. Lewis

2009-01-01

311

Modeling the costs and benefits of dam construction from a multidisciplinary perspective  

E-print Network

: Dam construction Dam removal Program evaluation a b s t r a c t Although the benefits of damModeling the costs and benefits of dam construction from a multidisciplinary perspective Philip H for electricity, recent experience has shown that many dams have serious negative environmental, human

Tullos, Desiree

312

Dynamic model failure tests of dam structures Dalian University of Technology, Dalian 116024, China  

E-print Network

Dynamic model failure tests of dam structures Gao Lin Dalian University of Technology, Dalian 116024, China ABSTRACT: For the earthquake safety evaluation of dam structures, it is desirable to extend failure tests of a number of concrete gravity dams, concrete arch dams and embankment dams have been

Spencer Jr., B.F.

313

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

314

Seismic Simulation and Base Sliding of Concrete Gravity Dams  

Microsoft Academic Search

\\u000a A simplified procedure to estimate possible base sliding of concrete gravity dams induced by an earthquake is proposed on\\u000a the basis of results obtained by parametric analysis. A simple mechanical model is developed to take into account the most\\u000a relevant parameters influencing seismic response such as dam-water and dam-foundation interaction. In order to catch base\\u000a residual displacement, a threshold value

M. Basili; C. Nuti

315

Left-bank dam of the Bratsk hydroelectric station  

Microsoft Academic Search

Conclusions 1.According to the data of 16-yr observations the left-bank earth dam is operating satisfactorily.2.Settlement of the dam, forming due to consolidation of its soils, has still not ended, but is already noticeably decreasing.3.The seepage regime at the dam site meets the calculated condition, but differs somewhat from the design forecasts owing to anisotropy of the sandstones which was not

Z. I. Solov'eva; Yu. A. Zhebelev

1984-01-01

316

Innovative resettlement schemes planned for the Numata Dam project  

NASA Astrophysics Data System (ADS)

The Numata Dam, planned for the Tone River basin of Gunma Prefecture, was the largest dam construction project ever considered in Japan. This dam construction project, however, did not materialize. The proposal for the Numata Dam was first launched in 1959, at a time when the Tokyo Metropolitan area was mushrooming, both in population and industrial activity. The Numata Dam was supposed to be a prioritized dam construction project to alleviate the then anticipated water shortage in the Tokyo Metropolitan area. The Numata Dam plan experienced fierce opposition from those who would have been obliged to resettle, whereas those in Tokyo and the surrounding metropolitan area welcomed the plan. The major concern of the planned Numata Dam was the number of resettlers, which was then estimated to be around 3000 families. The resettlement plan developed for the Numata Dam included some innovative concepts, which may be applicable even today, for dam construction projects in the developing world. The plan included such ideas as (a) having resettlers share existing farmland with the present owners provided improvements were made to increase productivity, (b) paying rent to resettlers, and (c) establishing the Tone River Development Agency. After more than a decade of debate, both at national and local levels, the Numata Dam project was finally discarded through a decision of the Prime Minister in 1972. The resettlement schemes elaborated for the Numata Dam still appear to be innovative. Such schemes may be applied to projects in the developing world, in particular, in nations that are about to take off with economic development. Copyright

Nakayama, Mikiyasu

2003-10-01

317

3D effects on the seismic performance of earthfill dams.  

NASA Astrophysics Data System (ADS)

Conventionally the seismic performance of earth dams is usually studied by assuming plane-strain problems. However, considerable effort is required to estimate the overall three dimensional dynamic response of dams as a result of earthquake hazard. The cumbersomeness increases when the dam is to be constructed in narrow canyon. This is so because the plane strain analysis does not take into account the arching effect of the valley which is particularly relevant for dams in narrow valleys. Researches reported in this paper represent 3D numerical study of an earthfill dam subjected to earthquake loading and 3D effects on its seismic performance. The shapes of the canyon are varied to determine the related 3D effects to the seismic performance of the assumed earthfill dam model. A finite difference numerical code, FLAC3D is used during the study. The assumed 3D model contains all details of the dam body and foundation materials of Tendaho earthfill dam. The dam is an earth fill dam located in Afar regional state of Ethiopia. The area is a seismically active area as it lies on the East African Rift valley which can generate earthquake of magnitude greater than 6. The results of the study indicated an important clue which analysis model (3D or 2D) to use for which problem. Results and discussions related with the 3D effects on the seismic performance of earthfill dams are presented and applied to the seismic performance study of Tendaho dam. Keywords: 3D, narrow canyon, seismic performance, earthquake hazard, plane-strain, arching.

Berhe, Tensay; Wu, Wei

2010-05-01

318

Providing protection: Agencies receive funding to repair, upgrade dams  

E-print Network

Story by Kathy Wythe tx H2O | pg. 26 Providing protection Agencies receive funding to repair, upgrade dams along with local partners, can apply for grant funds, he said. Construction of the dams began through four federal authorizations.... With recent funding from Congress and the Texas Legislature, the U.S. Department of Agriculture?s Natural Resources Conservation Service (NRCS), and the Texas State Soil and Water Conservation Board (TSSWCB) can repair or upgrade some of these dams...

Wythe, Kathy

2009-01-01

319

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

320

IMPACTS OF LANDSLIDE DAMS ON MOUNTAIN VALLEY MORPHOLOGY  

Microsoft Academic Search

Landslide dams can influence mountain-valley morphology significantly in the vicinity of the dam sites, as well as upstream\\u000a and downstream. The effects are: (1) impoundment of lakes that results in changes in stream gradients, (2) deposition of lacustrine\\u000a and deltaic sediments in these impoundments that causes changes in surficial morphology and geologic materials upstream from\\u000a the dams, (3) diversion of

R. L. SCHUSTER

321

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

322

Recent sediment studies refute Glen Canyon Dam hypothesis  

USGS Publications Warehouse

Recent studies of sedimentology hydrology, and geomorphology indicate that releases from Glen Canyon Dam are continuing to erode sandbars and beaches in the Colorado River in Grand Canyon National Park, despite attempts to restore these resources. The current strategy for dam operations is based on the hypothesis that sand supplied by tributaries of the Colorado River downstream from the dam will accumulate in the channel during normal dam operations and remain available for restoration floods. Recent work has shown that this hypothesis is false, and that tributary sand inputs are exported downstream rapidly typically within weeks or months under the current flow regime.

Rubin, David M.; Topping, David J.; Schmidt, John C.; Hazel, Joe; Kaplinski, Matt; Melis, Theodore S.

2002-01-01

323

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

324

LITTER DAMS: A NEW METHOD OF MAPPING SURFACE DISPERSION VECTORS AT THE WHITE DAM PROSPECT, CURNAMONA CRATON, SA  

Microsoft Academic Search

A novel approach to measuring surface dispersion vectors has been developed at the White Dam Au-Cu prospect in South Australia. The use of 'stick dams', also known as 'litter dams', has allowed for the mapping of surface dispersion vectors to accompany detailed (1:2,000) regolith-landform mapping. This can also be used as a tool in interpreting geochemical results in areas of

A. D. Brown; S. M. Hill

325

River response to dam removal: the Souhegan River and the Merrimack Village Dam, Merrimack, New Hampshire  

Microsoft Academic Search

The Souhegan River is a tributary of the Merrimack River that drains a 443 km2 watershed in southern New Hampshire. The lowermost barrier on the Souhegan River was the ~4-m high Merrimack Village Dam (MVD, ~500 m upstream of the confluence with the Merrimack River), which was breached and removed starting on August 6, 2008. The MVD was built in

A. J. Pearson; N. P. Snyder; M. J. Collins; D. J. Santaniello

2009-01-01

326

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

327

Horse and Libby dams. VarQ was made permanent at Libby and Hun-gry Horse dams by 2009, after an extensive Environmental  

E-print Network

VarQ Horse and Libby dams. VarQ was made permanent at Libby and Hun- gry Horse dams by 2009, afterQ providedecosystembenefitswhilemaintainingthesameFRMbenefits as under standard FRM. How Does VarQ Impact Canada? Above Libby Dam, both U of the border. Below Libby Dam, both U.S. and Canadian fish populations benefit from river flows that more

328

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

329

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

330

BASINWIDE SEDIMENTATION PROCESSES AT GLACIER-DAMMED ICEBERG LAKE, SOUTHCENTRAL ALASKA  

E-print Network

BASINWIDE SEDIMENTATION PROCESSES AT GLACIER-DAMMED ICEBERG LAKE, SOUTHCENTRAL 2012 BASINWIDE SEDIMENTATION PROCESSES AT GLACIER-DAMMED ICEBERG LAKE, SOUTHCENTRAL ALASKA by Katie E examining sedimentation rates and varve thickness at Iceberg Lake, a glacier-dammed proglacial lake

Loso, Michael G.

331

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

332

33 CFR 208.34 - Norman Dam and Lake Thunderbird, Little River, Okla.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 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...

2012-07-01

333

33 CFR 208.34 - Norman Dam and Lake Thunderbird, Little River, Okla.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 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...

2011-07-01

334

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

335

33 CFR 165.T09-0405 - Safety Zone; Salvage Operations at Marseilles Dam; Illinois River.  

Code of Federal Regulations, 2013 CFR

...Safety Zone; Salvage Operations at Marseilles Dam; Illinois River. 165.T09-0405 ...Safety Zone; Salvage Operations at Marseilles Dam; Illinois River. (a) Location. ...extending 600 yards upstream of the Marseilles Dam to Mile Marker 247.2. (b)...

2013-07-01

336

Quasi-stable Slope-Failure Dams in High Asia  

NASA Astrophysics Data System (ADS)

Collapses of steep mountain slopes in the Himalaya, Karakoram, Pamir, Hindu Kush, and Tibetan Plateau are well known as a result of:(1) generally high seismicity in active tectonic areas; (2) prior deglaciation leaving undercut, unstable cliffs; (3) present-day debuttressing of rock cliffs by glacial down-wasting in conditions of global warming; and (4) degradation of permafrost cohesion and water-ice cementation in high mountain slopes. Landslide dams across mountain rivers are also well known worldwide and generally do not endure for long because of the common landslide-lake outburst floods (LLOF) whose discharge is commonly sufficiently large to remove much of the dam in a short time. A number of massive slope-failure dams in south High Asia, however, have endured for centuries and require explanations for the length of duration, whereas recent examples require robust assessment for better predictive hazard analysis. Three main factors contribute to longevity of slope-failure dams: (1) mega-rocks >15-30 m that inhibit dam failure in overflow breaches; (2) mega-porosity wherein incoming discharge to the landslide lake is balanced by subterranean water through-flow within the landslide dam; (3) impermeable clay fills caused by remobilization of prior lacustrine-dammed sediment that impart dam strength to allow lasting integrity for a time, and (4) climate-change induced lake-level lowering. Several examples of long-lived or unusually stable, slope-failure dams associated with pronounced structural/tectonic associations include: (1) Pangong Tso, Ladakh and Tibet; (2) Lake Shewa, Afghanistan; (3) Sarez Lake, Tajikistan; and (4) Lake Hunza, Pakistan. Pangong Tso and Lake Shewa were emplaced thousands of years ago and only Lake Shewa shows some instability of the dam front where percolating water maintains lake level but may be causing new slumping. Sarez Lake behind the Usoi landslide dam was emplaced by an earthquake in 1911 and maintains its level by seepage. Lake Hunza developed behind a new landslide dam in 2010 but remobilized lacustrine clay from a prior damming event and large blocks have maintained dam integrity in spite of overflow beginning 29 May 2010. Character and condition of landslide dams clearly controls whether LLOF or stability will prevail.

Shroder, J. F.

2010-12-01

337

Gypsum-karst problems in constructing dams in the USA  

NASA Astrophysics Data System (ADS)

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.

Johnson, Kenneth S.

2008-01-01

338

Battle looms over hydroelectric dam relicensing  

SciTech Connect

Environmental groups, buoyed by support from influential lawmakers, are vowing to change the Federal Energy Regulatory Commission's (FERC's) hydroelectric relicensing procedures. For too long, the groups say, the hydroelectric industry has benefitted from a cozy relationship with the FERC, which has emphasized economic over environmental considerations. The success or failure of the environmentalists agenda will likely prove critical to the hydroelectric industry. With 237 hydroelectric licenses up for renewal this year - the most ever considered by the FERC in one year - and four vacant seats at the Commission, FERC hydro policy appears poised for upheaval. The groups have proposed a multipoint program to address perceived shortcomings in the FERC's hydroelectric relicensing procedures. The program includes recommendations to: Shorten dam licenses (which currently stretch 30 to 50 years) and require the FERC to periodically reevaluate the terms of hydropower licenses; Increase Congressional oversight of the FERC to assure adherence to environmental laws, including the National Environmental Policy Act, which mandates the preparation of environmental impact statements where appropriate; Mandate facilities for upstream and downstream fish passage; Establish a mitigation fund, collectable from dam owners, for river conservation and restoration programs; Promote all alternatives to relicensing projects, including denial of project licenses; and Reassign the FERC's hydropower jurisdiction to another federal agency, such as the Environmental Protection Agency or the Department of the Interior.

Simpson, J.

1993-04-15

339

NOVA: Bombing HitlerâÂÂs Dams  

NSDL National Science Digital Library

NOVA is well-known for its engaging documentaries and the team delivers once more with âÂÂBombing HitlerâÂÂs Dams.â Located within the Military + Espionage section of the NOVA site, this episode follows experts as they recreate the 1943 efforts of the âÂÂdam busterâ pilots and their one-of-a-kind bouncing bomb. A revolutionary secret weapon, the bomb was used to destroy two German dams, effectively cutting off the water supply to vital arms factories during WWII. The entire episode (nearly 2 hours in length) can be viewed here, accompanied by a complete Transcript of the program and Related Links, such as âÂÂD-DayâÂÂs Sunken Secretsâ and âÂÂEscaping a Nazi Prison Camp.â Visitors can also read through the TV Schedule to view Upcoming Broadcasts or Recent Broadcasts that can all be viewed online and are accompanied by related websites, articles, interviews, slideshows, and other great features.

2012-01-11

340

54. AVALON DAM (Photographic copy of photo in Reservoirs ...  

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

54. AVALON DAM - (Photographic copy of photo in Reservoirs for Irrigation, Water-Power, and Domestic Water Supply. New York: John Wiley & Sons, 1902.) 'ROCK-FILL IN PROCESS OF CONSTRUCTION' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

341

33 CFR 117.705 - Beaver Dam Creek.  

Code of Federal Regulations, 2010 CFR

...Navigable Waters 1 2010-07-01 2010-07-01 false Beaver Dam Creek. 117.705 Section 117.705 Navigation and...REGULATIONS Specific Requirements New Jersey § 117.705 Beaver Dam Creek. The draw of the Ocean County bridge,...

2010-07-01

342

Foundation Investigation at Hickory Log Creek Dam, Canton, Georgia  

Microsoft Academic Search

Hickory Log Creek Dam is a proposed 55 meter high roller compacted concrete dam located on a tributary of the Etowah River near Canton, Georgia. The site characterization involved several app roaches that facilitated the rapid foundation investigation schedule. These included identification of critical data needs, design of the program to collect these data, and selection of preferred data acquisition

Gary D. Rogers; Chuck Kahler; Scott Deaton

343

Selection of parameters monitoring the reliable operation of concrete dams  

Microsoft Academic Search

Conclusions 1.The conditionality of any calculation scheme of the static behavior of a structure does not make it possible to assign design values of the maximum seepage discharge, settlement of the foundation, displacement of the dam crest, level of stresses, and character of their distribution.2.An analysis of the actual data on the behavior of the dam during its construction and

V. N. Durcheva; S. M. Puchkova

1990-01-01

344

Geo-Seismic Environmental Aspects Affecting Tailings Dams Failures  

Microsoft Academic Search

Seismic performance evaluations of tailings dams are essential for characterizing the geo- environmental risks posed by these earthen structures, which should include the geotechnical hazards implied by slope instability failure, free board loss and the potential release of contaminants. The observed damage is more important when liquefaction occurs on the dam body and foundation, which often leads to cracking, settlements,

Juan M. Mayoral; Miguel P. Romo

2008-01-01

345

The Application of GPS To Dam Surface Monitoring  

Microsoft Academic Search

Dam monitoring relies on the long-term measurement of small structural motions at regular intervals. Traditional surveying techniques and geotechnical instrumentation can effectively monitor one- or two- dimensional modes of motion. However, spatial distribution of geotechnical instrumentation is usually limited to the locations that the instruments can be installed during dam construction, whilst surface monitoring by traditional surveying techniques is a

M STEWART; M TSAKIRI

346

9. Analysis a. Analysis tools for dam removal  

E-print Network

reservoir sediment when removing a dam are river erosion, mechanical removal, and stabilization (ASCE 19979. Analysis a. Analysis tools for dam removal v. Hydrodynamic, sediment transport and physical modeling 1.0 Rationale Sediment erosion from the reservoir and subsequent deposition downstream

Tullos, Desiree

347

dam logic: qualitative reasoning about benthic macroinvertebrate responses  

E-print Network

quickly from sediment releases #12;but...the dam bugs · declines in densities and shifts in species composition of macroinvertebrate communities observed with sediment flushing of reservoirs (Zuellig et aldam logic: qualitative reasoning about benthic macroinvertebrate responses to dam removal desiree

Tullos, Desiree

348

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

349

Channel evolution on the dammed Elwha River, Washington, USA  

Microsoft Academic Search

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

Amy E. Draut; Joshua B. Logan; Mark C. Mastin

2011-01-01

350

22. Close up view of Mormon Flat Dam, original power ...  

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

22. Close up view of Mormon Flat Dam, original power house and HEFU upgrades. Spillway lip, at center, is part of the approach road. Photographer Mark Durben, 1988. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

351

26. At Willard, Little Salmon Creek. Site of former dam ...  

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

26. At Willard, Little Salmon Creek. Site of former dam and water supply pond for Broughton flume. Remains of dam structures on right and left banks. North/northeast 80 degrees. - Broughton Flume, Hood River Junction on Columbia River at Washington/Oregon border, Hood, Skamania County, WA

352

Fallback by Adult Sockeye Salmon at Columbia River Dams  

Microsoft Academic Search

We implanted radio transmitters into sockeye salmon Oncorhynchus nerka in 1997 to determine the (1) fallback percentage and rate at eight Columbia River dams, (2) effect of fallback on adult counts at each dam, (3) relations between spillway discharge and fallback, (4) relations between injuries and fallback, and (5) relations of fallback and survival to spawning tributaries. The rate of

George P. Naughton; Christopher C. Caudill; Matthew L. Keefer; Theodore C. Bjornn; Christopher A. Peery; Lowell C. Stuehrenberg

2006-01-01

353

27. At Willard, Little Salmon Creek. Site of former dam ...  

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

27. At Willard, Little Salmon Creek. Site of former dam and water supply pond for Broughton flume. View of dam structures - wing walls, overflow shute to right, camera in middle of flume intake from pond. North/northeast 40 degrees. - Broughton Flume, Hood River Junction on Columbia River at Washington/Oregon border, Hood, Skamania County, WA

354

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

355

Study on Cemented-rockfill Dam in Hydropower Station Construction  

Microsoft Academic Search

The selection of dam type is an important technical problem in hydropower station construction. Concrete face rockfill dam (CFRD) has been used to build many hydropower stations in recent years as it has less cost and can be built with local materials. In order to solve the great deformation of rockfill which may lead to concrete face and watertight seal

Yunfeng Peng; Chao Hu; Rong Chen

2010-01-01

356

15. UPSTREAM VIEW (PHOTOGRAPHER UNKNOWN) SHOWING BIG DALTON DAM NEAR ...  

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

15. UPSTREAM VIEW (PHOTOGRAPHER UNKNOWN) SHOWING BIG DALTON DAM NEAR FULL CAPACITY AFTER CONSTRUCTION. PICTURE WAS DEVELOPED FROM COPY NEGATIVES WHICH WERE TAKEN ON 2-15-1973 BY PHOTOGRAPHER D. MEIER OF L.A. COUNTY PUBLIC WORKS. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

357

16. AERIAL VIEW OF BIG DALTON DAM TAKEN ON 2161962 ...  

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

16. AERIAL VIEW OF BIG DALTON DAM TAKEN ON 2-16-1962 BY L.A. COUNTY PUBLIC WORKS PHOTOGRAPHER SINGER. PHOTO SHOWS THE RESERVOIR NEAR FULL CAPACITY AND WATER BEING RELEASED ON THE DOWNSTREAM SIDE. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

358

11. VIEW OF UPSTREAM ELEVATION OF BIG DALTON DAM SHOWING ...  

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

11. VIEW OF UPSTREAM ELEVATION OF BIG DALTON DAM SHOWING CONSTRUCTION OF THE ARCH WALLS, TAKEN ON SEPTEMBER 11, 1928 (PHOTOGRAPHER UNKNOWN). PICTURE WAS DEVELOPED FROM COPY NEGATIVES WHICH WERE TAKEN ON 6/5/1973 BY PHOTOGRAPHER GATSON OF L.A. COUNTY PUBLIC WORKS. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

359

13. VIEW OF DOWNSTREAM ELEVATION OF BIG DALTON DAM SHOWING ...  

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

13. VIEW OF DOWNSTREAM ELEVATION OF BIG DALTON DAM SHOWING CONSTRUCTION OF THE ARCHES AND ARCH WALLS TAKEN IN 1928-1929 (PHOTOGRAPHER UNKNOWN). PICTURE WAS DEVELOPED FROM COPY NEGATIVES WHICH WERE TAKEN ON 2-15-1973 BY PHOTOGRAPHER D. MEIER OF L.A. COUNTY PUBLIC WORKS. - Big Dalton Dam, 2600 Big Dalton Canyon Road, Glendora, Los Angeles County, CA

360

Dr.Thomas Van Dam Dr. Peter Taylor  

E-print Network

Authors Dr.Thomas Van Dam Dr. Peter Taylor SUSTAINABLE PAVEMENTS WITH CONCRETE BRIEFING DOCUMENT Harrington, Snyder & Associates. The primary technical expert is Tom Van Dam, Program Manager, Applied. Inquiries can be directed to the Director of Equal Opportunity and Diversity, (515) 294-7612. #12;BUILDING

361

Oblique view, looking eastnortheast, of top of diversion dam. Service ...  

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

Oblique view, looking east-northeast, of top of diversion dam. Service bridge on left, gatehouse and roller gate (raised position) on right - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

362

Oblique overview, looking westsouthwest, of north side of diversion dam, ...  

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

Oblique overview, looking west-southwest, of north side of diversion dam, showing eastern profiles of towers, piers, and rollers. Headworks in background - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

363

Oblique overview, looking northeast, of south side of diversion dam, ...  

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

Oblique overview, looking northeast, of south side of diversion dam, showing western profiles of towers, piers, and rollers. Note lateral recesses in piers for gate operating mechanisms. Southeast sluiceway wall in foreground. - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

364

31. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO SOUTH. ...  

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

31. AERIAL VIEW OF BOISE DIVERSION DAM. VIEW TO SOUTH. Photocopy of photograph by Glade Walker, U.S. Bureau of Reclamation, Pacific Northwest Region, September 3, 1978. - Boise Project, Boise River Diversion Dam, Across Boise River, Boise, Ada County, ID

365

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

366

Oblique overview, looking southeast, of north side of diversion dam, ...  

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

Oblique overview, looking southeast, of north side of diversion dam, showing western profiles of towers, piers, and rollers. Northeast sluiceway wall in foreground - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

367

IMPACT PREDICTION OF THE REACTIVATION OF AN UNUSED TAILINGS DAM  

Microsoft Academic Search

A frequent occurrence in areas with a long history of mining is the reactivation of mine residue deposits. This paper presents an impact prediction study conducted for the reactivation of a gold tailings dam. Two phases of new tailings deposition are proposed. The objective of the study was to assess the potential impact on downstream groundwater quality. The tailings dam

TERRY HARCK; BERNADETTE AZZIE; CATRIONA COYLE; TALITA GERMISHUYSE; RAVI VADAPALLI; ALBERT VAN ZYL

368

Lead isotopes as seepage indicators around a uranium tailings dam  

Microsoft Academic Search

Lead isotope ratios and lead concentrations have been measured in water from 26 bores around the Ranger uranium tailings dam, Northern Territory, Australia, and from the dam itself to determine possible migration of lead derived from the radioactive decay of uranium. Lead isotope compositions have also been measured for the particulates retained on selected filters. The concentration of lead in

Brian L. Gulson; Karen J. Mizon; Michael J. Korsch; Barry N. Noller

1989-01-01

369

Geological impact of some tailings dams in Sardinia, Italy  

Microsoft Academic Search

This article deals with the results of a survey carried out in Sardinia on both active and abandoned tailings dams, and we also discuss the geological impact of tailings dams of two mines: the Masua mine, a large syngenetic Pb-Zn deposit located in Cambrian limestones, and the Montevecchio mine, a Pb-Zn vein deposit near a Hercynian granite intrusion. The characteristics

Felice Di Gregorio; Raniero Massoli-Novelli

1992-01-01

370

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

371

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 Navigable...REGULATIONS Specific Requirements New Jersey § 117.705 Beaver Dam Creek. The draw of the Ocean County bridge, mile...

2013-07-01

372

33 CFR 117.705 - Beaver Dam Creek.  

Code of Federal Regulations, 2011 CFR

...Waters 1 2011-07-01 2011-07-01 false Beaver Dam Creek. 117.705 Section 117.705 Navigation and Navigable...REGULATIONS Specific Requirements New Jersey § 117.705 Beaver Dam Creek. The draw of the Ocean County bridge, mile...

2011-07-01

373

33 CFR 117.705 - Beaver Dam Creek.  

Code of Federal Regulations, 2012 CFR

...Waters 1 2012-07-01 2012-07-01 false Beaver Dam Creek. 117.705 Section 117.705 Navigation and Navigable...REGULATIONS Specific Requirements New Jersey § 117.705 Beaver Dam Creek. The draw of the Ocean County bridge, mile...

2012-07-01

374

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

375

Wavelet-Based Multiresolution Analysis of Wivenhoe Dam Water Temperatures  

E-print Network

- tations Xt recorded at dam wall (temperature is regarded as important driver for other water qualityWavelet-Based Multiresolution Analysis of Wivenhoe Dam Water Temperatures Don Percival Applied;Background: I · Queensland Bulk Water Supply Authority (Seqwater) manages catchments, water storages

Percival, Don

376

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

377

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

378

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

379

Failure analysis of the granite for a dam foundation  

NASA Astrophysics Data System (ADS)

This paper presents the numerical and experimental investigation of a dam foundation. The site consists of granite and especially weathered granite. Numerical and analytical analyses have been conducted to evaluate suitability of the granite for a dam foundation. Mohr Coulomb failure criterion has been used to calculate the compressive strength of the rock mass. Finite element implementation of Mohr Coulomb criterion has been used for deformation and settlement analysis. Packer testing and in-situ estimation of rock mass deformability using the Goodman jack have been performed. The results of the evaluations show that very small normal and differential settlements can be expected in structural regions due to dam construction, and the compacted concrete dam can safely be constructed on either the competent granite or the weathered granite. However, the dam foundation on the weathered granite has high conductivity potential problems for the reservoir.

Arslan, Haydar; Rosassanchez, Leonardo

2008-05-01

380

Performance of San Fernando dams during 1994 Northridge earthquake  

SciTech Connect

The 1994 Northridge and 1971 San Fernando Earthquakes subjected the Lower and Upper San Fernando Dams of the Van Norman Complex in the San Fernando Valley, Calif., to strong near-source ground motions. In 1994, these earth dams, which were out of service and retained only a few meters of water, extensively cracked and settled due to the liquefaction of their hydraulic fill. The Lower San Fernando Dam moved over 15 cm upstream as the hydraulic fill liquefied beneath its upstream slope. The Upper San Fernando Dam moved even more and deformed in a complicated three-dimensional pattern. The responses of the Lower and Upper San Fernando Dams during the 1994 Northridge Earthquake, although less significant than in 1971, provide the geotechnical engineering community with two useful case histories.

Bardet, J.P. [Univ. of Southern California, Los Angeles, CA (United States). Civil Engineering Dept.] [Univ. of Southern California, Los Angeles, CA (United States). Civil Engineering Dept.; Davis, C.A. [Los Angeles Dept. of Water and Power, CA (United States)] [Los Angeles Dept. of Water and Power, CA (United States)

1996-07-01

381

A Vulnerability Assessment Approach for Dams of Mississippi  

NASA Astrophysics Data System (ADS)

As part of a state-wide effort to characterize the vulnerability of Mississippi's dams, we are developing a new set of vulnerability assessment tools. Our vulnerability assessment methods will consider earlier attempts to develop risk indexing methods for dams, but will be designed to be applied to Mississippi's entire database of over 3,700 dams. Unlike earlier efforts to dams, which emphasized hazards posed by the dams, our methods will be designed to consider intrinsic and extrinsic vulnerability, and consider consequences as well. Intrinsic sources of vulnerability consider such factors as the potential for unstable slopes, piping, and spillway inadequacy. Extrinsic sources of vulnerability will include features such as the potential for intentional or unintentional human acts. Other factors that will be included will be the potential for neglect of maintenance of the dam and susceptibility to interference from wildlife. Consequences will be assessed by considering the downstream population and economic resources that may be at risk due to an uncontrolled release of the reservoir. The analysis of these vulnerabilities and consequences is being calculated using a GIS-based database of all of Mississippi's dams along with population distribution, terrain, and economic resources across the state. Conventional methods of analysis of a dam breach or other uncontrolled release will still be necessary, but the extent to which downstream features and population are affected can be more readily identified. This approach facilitates assessment and decision making on a large dam inventory to permit resources within the state to be directed efficiently to dams that merit attention.

Kuszmaul, J. S.; Gunter, B.; McGregor, G.; Holt, R. M.; Pickens, J.; Holtz, T.; Jones, T.; Phillips, P.

2007-12-01

382

Channel evolution on the dammed Elwha River, Washington, USA  

NASA Astrophysics Data System (ADS)

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, Amy E.; Logan, Joshua B.; Mastin, Mark C.

2011-04-01

383

Sediment Transport and Deposition Resulting from a Dam-Removal Sediment Pulse: Milltown Dam, Clark Fork River, MT  

Microsoft Academic Search

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

A. C. Wilcox

2010-01-01

384

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

385

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

386

Planning for a Large Dam Project: The Case of Traveston Crossing Dam  

Microsoft Academic Search

The approval for a large dam project proposal these days predominantly involves satisfying broadly the criteria of economic\\u000a development, social equity, and environmental sustainability. It is justified that the criterion of economic development seeks\\u000a full project cost recovery as well as significant contribution to economic growth of a region. Cost–benefit analysis is normally\\u000a used as the yardstick for economic development

Saleh Ahmed Wasimi

2010-01-01

387

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

388

Diverting water at dams during construction of hydro plants  

SciTech Connect

The Federal Energy Regulatory Commission (FERC) estimates that hydropower could contribute another 24,000 MW of electricity to the US power supply by building new plants at existing dams. (Conventional hydro currently contributes about 71,800 MW of electricity.) When installing a plant at an existing dam, it is often feasible to connect the plant to the existing outlet works of the dam. To do this, however, typically requires a temporary shutdown of the outlet works during construction. Since most dam owners are required to discharge a minimum flow of water through the outlet works to meet water quality standards, some type of temporary diversion scheme is essential. The Incorporated County of Los Alamos, New Mexico, was recently faced with this situation when constructing a hydroelectric project at an existing US Army Corps of Engineers' dam. The county hired Tudor Engineering Company in Oakland, California, to perform the design for the hydro project, including a water diversion system that temporarily conveyed reservoir discharges over the dam to the river downstream. The diversion was necessary so modifications could be made to the outlet works of the dam where the county was building its 13-MW plant. This system, comprised of pumps mounted on a floating barge in the reservoir, allowed the Corps of Engineers to maintain required instream flows while the outlet works were being modified.

Kneitz, P.R. (Tudor Engineering Company, Oakland, CA (United States))

1991-04-01

389

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

390

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

391

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

392

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

393

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

394

Quantifying and Generalizing Hydrologic Responses to Dam Regulation using a Statistical Modeling Approach  

SciTech Connect

Despite the ubiquitous existence of dams within riverscapes, much of our knowledge about dams and their environmental effects remains context-specific. Hydrology, more than any other environmental variable, has been studied in great detail with regard to dam regulation. While much progress has been made in generalizing the hydrologic effects of regulation by large dams, many aspects of hydrology show site-specific fidelity to dam operations, small dams (including diversions), and regional hydrologic regimes. A statistical modeling framework is presented to quantify and generalize hydrologic responses to varying degrees of dam regulation. Specifically, the objectives were to 1) compare the effects of local versus cumulative dam regulation, 2) determine the importance of different regional hydrologic regimes in influencing hydrologic responses to dams, and 3) evaluate how different regulation contexts lead to error in predicting hydrologic responses to dams. Overall, model performance was poor in quantifying the magnitude of hydrologic responses, but performance was sufficient in classifying hydrologic responses as negative or positive. Responses of some hydrologic indices to dam regulation were highly dependent upon hydrologic class membership and the purpose of the dam. The opposing coefficients between local and cumulative-dam predictors suggested that hydrologic responses to cumulative dam regulation are complex, and predicting the hydrology downstream of individual dams, as opposed to multiple dams, may be more easy accomplished using statistical approaches. Results also suggested that particular contexts, including multipurpose dams, high cumulative regulation by multiple dams, diversions, close proximity to dams, and certain hydrologic classes are all sources of increased error when predicting hydrologic responses to dams. Statistical models, such as the ones presented herein, show promise in their ability to model the effects of dam regulation effects at large spatial scales as to generalize the directionality of hydrologic responses.

McManamay, Ryan A [ORNL

2014-01-01

395

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

396

LEAKAGE THROUGH GEOSYNTHETIC DAM LINING SYSTEMS Christine T. Weber, The University of Texas at Austin  

E-print Network

liner as a redundant lining system for earth dams. Introduction Embankment dams are susceptible to internal erosion and piping. Geomembranes have been used in dam rehabilitation projects as a way and have been placed on either the upstream face of the dam or in its core. Geomembranes have also been

Zornberg, Jorge G.

397

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

398

Surface Water-Groundwater Connectivity Under Dam Operations and Potential Trajectories Under Drought  

E-print Network

Surface Water-Groundwater Connectivity Under Dam Operations and Potential Trajectories Under Bencala (USGS) #12;Hydropeaking #12;Mansfield Dam Tom Miller Dam Longhorn Dam Study Site #12;Flushing;Electrical Resistivity Tomography #12;Mixing of groundwater and river water in the riverbed #12;Delineation

Yang, Zong-Liang

399

Post-construction settlement of rockfill dams analyzed via adaptive network-based fuzzy inference systems  

Microsoft Academic Search

An attempt has been made to investigate the possibility of using adaptive network-based fuzzy inference systems to predict the post-construction settlement of rockfill dams. Four types of dams, namely, central core, sloping core, compacted membrane faced, and dumped membrane faced rockfill dams are considered in this study. An index is defined to indicate the combined compressibility of the dam embankment

Ghassem Habibagahi

2002-01-01

400

Effect of reservoir boundaries on the seismic response of gravity dams  

Microsoft Academic Search

Dam safety is an important issue of current interest. In seismic regions, dynamic forces on the dam may be significant and may lead to crack initiation and propagation in the dam. A significant component of the dynamic forces is due to the hydrodynamic effects of the impounded water in the reservoir. The developed hydrodynamic force on the dam is highly

Kianoosh Hatami

1997-01-01

401

A. Reservoir Effects of Stream Channels DAM IMPACTS ON AND RESTORATION OF AN ALLUVIAL RIVER  

E-print Network

A. Reservoir Effects of Stream Channels DAM IMPACTS ON AND RESTORATION OF AN ALLUVIAL RIVER ­ RIO and reservoirs on alluvial rivers extends both upstream and downstream of the dam. Downstream of dams, both and sediment retention. Prior to dam construction, the Rio Grande was a wide, sandy braided river. Following

Julien, Pierre Y.

402

DOWNSTREAM CHANNEL CHANGES AFTER A SMALL DAM REMOVAL: USING AERIAL PHOTOS AND MEASUREMENT ERROR FOR CONTEXT;  

E-print Network

). There are a myriad of problems associated with the aging of dams: reservoir sedimentation leading to reduced storage in the reservoir and downstream after a dam removal have been established based upon studies of dam removalsDOWNSTREAM CHANNEL CHANGES AFTER A SMALL DAM REMOVAL: USING AERIAL PHOTOS AND MEASUREMENT ERROR

Tullos, Desiree

403

Effects of upstream dams versus groundwater pumping on stream temperature under varying climate conditions  

E-print Network

with inreach pumping, and (4) no dam with pumping, resulting in 12 cases. Dam removal, in the presence constant. This approach provides a context for future in- vestigators to assess the impact of dam removalClick Here for Full Article Effects of upstream dams versus groundwater pumping on stream

404

Introduction to the special issue: Understanding and linking the biophysical, socioeconomic and geopolitical effects of dams  

E-print Network

). Dam removal is also emerging as a promising option for restoring continuums and reconnecting habitats the consequences of dam removal (Aspen Institute, 2002; Hart et al., 2002), particularly the unknowns related-disciplinary approaches for understanding and predicting how dams and dam removals affect societies and ecosystems

Tullos, Desiree

405

DOWNSTREAM BENTHIC RESPONSES TO SMALL DAM REMOVAL IN A COLDWATER STREAM  

E-print Network

DOWNSTREAM BENTHIC RESPONSES TO SMALL DAM REMOVAL IN A COLDWATER STREAM CAILIN H. ORR,* STEVE J with an aging dam infrastructure has led to an increase in dam removals. However, ecological responses removals on downstream periphyton and macroinvertebrates in Boulder Creek, WI (USA). The dams were 180 m

Stanley, Emily

406

Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA  

E-print Network

represent extremely vigorous erosion of a dam, they still conclude that removal of the dam was a resultPeak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA Cassandra R Received 6 May 2005 Availble online 7 February 2006 Abstract The failure of a lava dam 165,000 yr ago

407

Effects of Stronach Dam removal on fluvial geomorphology in the Pine River, Michigan, United States  

Microsoft Academic Search

Although dam removal has been increasingly used as an option in dam management, and as a river restoration tool, few studies provide detailed quantitative assessment of the geomorphological response of rivers to dam removal. In this study, we document the response of the Pine River, Michigan, to the gradual removal of Stronach Dam. In 1996, prior to the initiation of

Bryan A. Burroughs; Daniel B. Hayes; Kristi D. Klomp; Jonathan F. Hansen; Jessica Mistak

2009-01-01

408

Sediment from hydraulic mining detained by Englebright and small dams in the Yuba basin  

E-print Network

substantial modifications or removal of Englebright Dam, a large dam (86 million m3 capacity) built by the U to complete dam removal. This paper examines the extraordinary history of the watershed and resulting: Hydraulic gold mining sediment; Dam removal; Aquatic restoration, Sierra Nevada, California 0169-555X

James, L. Allan

409

Examination of Physical and Regulatory Variables Leading to Small Dam Removal in Wisconsin  

Microsoft Academic Search

The decision to remove or repair a dam depends on multiple variables, many of which encompass both physical and social factors. In Wisconsin, the Department of Natural Resources is mandated to inspect small dams every ten years. A safety inspection often acts as a trigger event to a dam removal or repair decision. Although the issues surrounding a dam removal

Cailin H. Orr; Brian M. Roth; Kenneth J. Forshay; James D. Gonzales; Michael M. Papenfus; Rebecca D. G. Wassell

2004-01-01

410

Benthic invertebrate assemblage change following dam removal in a Wisconsin stream  

Microsoft Academic Search

Small dams (height <10 m) have transformed stream networks across the United States. Shopiere Dam was removed from Turtle Creek, a fourth order stream in Southeastern Wisconsin in the fall of 1999. We sampled three sites (upstream of the impoundment, immediately below the dam, and farther downstream) before and after dam removal to identify changes in the invertebrate assemblage following

Amina I. Pollard; Tara Reed

2004-01-01

411

Signature of Rhine Valley sturzstrom dam failures in Holocene sediments of Lake Constance, Germany  

E-print Network

Signature of Rhine Valley sturzstrom dam failures in Holocene sediments of Lake Constance, Germany 4 November 2003; received in revised form 12 April 2004; accepted 26 April 2004 Abstract Landslide-dammed that the hyperpycnite deposits are directly related to the failure of two sturzstrom dams and the draining of the dammed

Gilli, Adrian

412

Discriminant analysis of the geomorphic characteristics and stability of landslide dams  

Microsoft Academic Search

Landslides can cause the formation of dams, but these dams often fail soon after lake formation. Thus, rapidly evaluating the stability of a landslide dam is crucial for effective hazard mitigation. This study utilizes discriminant analysis based on a Japanese dataset consisting of 43 well documented landslide dams to determine the significant variables, including log-transformed peak flow (or catchment area),

Jia-Jyun Dong; Yu-Hsiang Tung; Chien-Chih Chen; Jyh-Jong Liao; Yii-Wen Pan

2009-01-01

413

Evidence for fluoride effects on salmon passage at John Day Dam, Columbia River, 1982-1986  

Microsoft Academic Search

There is evidence that fluoride from an aluminum plant near John Day Dam had a significant negative effect on passage time and survival of adult Pacific salmon Oncorhynchus species at the dam. In 1982, fluoride concentrations of 0.3-0.5 milligrams per liter were recorded at the dam, these concentrations were probably representative of fluoride levels at the dam in earlier years

D. M. Damkaer; D. B. Dey

2009-01-01

414

Mutations within the Catalytic Motif of DNA Adenine Methyltransferase (Dam) of Aeromonas hydrophila Cause the Virulence of the Dam-Overproducing Strain To Revert to That of the Wild-Type Phenotype  

Microsoft Academic Search

In this study, we demonstrated that the methyltransferase activity associated with Dam was essential for attenuation of Aeromonas hydrophila virulence. We mutated aspartic acid and tyrosine residues to alanine within the conserved DPPY catalytic motif of Dam and transformed the pBAD\\/damD\\/A, pBAD\\/damY\\/A, and pBAD\\/damAhSSU (with the native dam gene) recombinant plasmids into the Escherichia coli GM33 (dam- deficient) strain. Genomic

Tatiana E. Erova; Amin A. Fadl; J. Sha; Bijay K. Khajanchi; Lakshmi L. Pillai; E. V. Kozlova; Ashok K. Chopra

2006-01-01

415

Analysis of Factors Affecting Stress Solution at Concrete Gravity Dam Heel  

NASA Astrophysics Data System (ADS)

Along with Vietnam's development, various hydraulic constructions including concrete gravity dams have been being built. In some of these dams, the fractures occurred at the heel of the dams are even in small and media dams. There are various reasons cause the factures at dam heel but the main reason is the stress states at dam heel are not determined correctly while designing dam. In this paper, several factors affecting stress solution at concrete gravity dam heel such as element mesh size, crack joints of upstream foundation, execution process are investigated by using finite element model of Banve concrete gravity dam. This work is very significant when the more high concrete gravity dams will be constructed in Vietnam year after year.

Hung, Vu Hoang; Quoc Cong, Trinh; Tongchun, Li

2010-05-01

416

Dynamic response of embankment, concrete-gravity and arch dams including hydrodynamic interaction  

SciTech Connect

An analysis procedure in the frequency domain for determining the earthquake responses of a dam was developed. The procedure inclides hydrodynamic interaction and water compressibility effects. Linear responses of idealized, two dimensional gravity dams and three dimensional dams, including arch dams were obtained. For an infinite uniform region a finite element discretization provides for a proper transmission of pressure waves. Hydrodynamic effects are equivalent to an added mass and added load in the frequency domain equations of motion of the dam. Complex frequency response functions for acceleration at the dam crest are presented for two dimensional concrete gravity and earth dams and for a three dimensional arch dam. Water compressibility and fluid foundation interaction significantly influence the response of concrete gravity dams and are even more important for each dam.

Hall, J.F.; Chopra, A.K.

1980-10-01

417

Route-Specific Passage Proportions and Survival Rates for Fish Passing through John Day Dam, The Dalles Dam, and Bonneville Dam in 2010 and 2011  

SciTech Connect

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 are published in late 2012. This report tabulates route-specific fish-passage proportions and survival rates for steelhead and Chinook salmon smolts passing through various sampled routes at John Day Dam, The Dalles Dam, and Bonneville Dam in 2010 and 2011. Results were compiled from analyses of data acquired in spring 2010 and 2011 studies that were specifically designed to estimate dam-passage and forebay-to-tailrace survival rates, travel time metrics, and spill passage efficiency, as stipulated by the 2008 Federal Columbia River Power System Biological Opinion and the Columbia Basin Fish Accords. The study designs allowed for estimation of route-specific fish passage proportions and survival rates as well as estimation of forebay-passage survival, all of which are summarized herein.

Ploskey, Gene R.; Weiland, Mark A.; Carlson, Thomas J.

2012-06-04

418

78 FR 7810 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

...Canyon Dam, consistent with the Grand Canyon Protection Act. The AMWG meets...consultation requirements of the Grand Canyon Protection Act (Pub. L. 102-575...technical work group (TWG), a Grand Canyon Monitoring and Research...

2013-02-04

419

VIEW OF BLAKELY ROAD ACROSS TUMALO DAM, RESERVOIR SIDE TO ...  

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

VIEW OF BLAKELY ROAD ACROSS TUMALO DAM, RESERVOIR SIDE TO RIGHT AND DOWNSTREAM SIDE TO LEFT. LOOKING EAST - Tumalo Irrigation District, Tumalo Project, West of Deschutes River, Tumalo, Deschutes County, OR

420

10. VIEW OF THE SEDIMENT DAM AND POND, FACING SOUTH. ...  

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

10. VIEW OF THE SEDIMENT DAM AND POND, FACING SOUTH. PHOTO TAKEN FROM WATER PUMP (FEATURE B-25). - Nevada Lucky Tiger Mill & Mine, East slope of Buckskin Mountain, Paradise Valley, Humboldt County, NV

421

12. Looking northwest along Adams Dam Road toward State Routes ...  

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

12. Looking northwest along Adams Dam Road toward State Routes 92 and 100 intersection, stone wall on right. - Winterthur Farms, Intersection State Routes 92 & 100, Intersection State Routes 92 & 100, Winterthur, New Castle County, DE

422

Some considerations in the stability analysis of upstream tailings dams  

Microsoft Academic Search

Upstream constructed tailings dams represent a significant challenge to the geotechnical engineer in terms of analysis of their stability, in large part because the shear strength of the loose sands and fine grained or \\

T. E. Martin; E. C. McRoberts

423

93. VIEW; OF THE WATER WORKS, RESERVOIRS, DAM AND PARK ...  

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

93. VIEW; OF THE WATER WORKS, RESERVOIRS, DAM AND PARK FROM LEMON HILL, CA. 1880 Collection of the Free Library of Philadelphia - Fairmount Waterworks, East bank of Schuylkill River, Aquarium Drive, Philadelphia, Philadelphia County, PA

424

16. GENERAL VIEW OF HOLYOKE DAM AND HOLYOKE WATER POWER ...  

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

16. GENERAL VIEW OF HOLYOKE DAM AND HOLYOKE WATER POWER CO. PLANT, THROUGH WEB OF UPSTREAM TRUSS, SPAN 1, VIEW TO W - Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Hadley Falls, Holyoke, Hampden County, MA

425

11. VIEW OF THE ROAD TO SEDIMENT DAM LOOKING FROM ...  

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

11. VIEW OF THE ROAD TO SEDIMENT DAM LOOKING FROM EDGE OF TAILINGS. WATER PUMP (FEATURE B-25) IS VISIBLE IN CENTER LEFT OF FRAME. - Nevada Lucky Tiger Mill & Mine, East slope of Buckskin Mountain, Paradise Valley, Humboldt County, NV

426

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.

427

GEOSYNTHETIC DAM LINING SYSTEMS By: Christine T. Weber1  

E-print Network

. A testing program involving quantification of leakage under high heads through geomembranes, soils, concrete as a solution to dam seepage problems since 1959. However, geomembranes are not absolutely impervious to water

Zornberg, Jorge G.

428

25 CFR 173.16 - Reserved area, Coolidge Dam.  

...THE INTERIOR LAND AND WATER CONCESSIONS, PERMITS AND LEASES ON LANDS WITHDRAWN OR ACQUIRED IN CONNECTION WITH INDIAN IRRIGATION PROJECTS § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business or other activity (except...

2014-04-01

429

25 CFR 173.16 - Reserved area, Coolidge Dam.  

Code of Federal Regulations, 2013 CFR

...THE INTERIOR LAND AND WATER CONCESSIONS, PERMITS AND LEASES ON LANDS WITHDRAWN OR ACQUIRED IN CONNECTION WITH INDIAN IRRIGATION PROJECTS § 173.16 Reserved area, Coolidge Dam. No permit for any commercial business or other activity (except...

2013-04-01

430

Geological impact of some tailings dams in Sardinia, Italy  

NASA Astrophysics Data System (ADS)

This article deals with the results of a survey carried out in Sardinia on both active and abandoned tailings dams, and we also discuss the geological impact of tailings dams of two mines: the Masua mine, a large syngenetic Pb-Zn deposit located in Cambrian limestones, and the Montevecchio mine, a Pb-Zn vein deposit near a Hercynian granite intrusion. The characteristics and metal content of material in the dams were analyzed. A high contamination of heavy metals (Pb, Zn, Cd, Cu) was found both in the soils and water of Rio Montevecchio, a stream draining the tailings dams and other mining operations in the area. The study indicates that a control plan to minimize heavy metal pollution must be drawn up for all mines of the area, whether active or abandoned.

di Gregorio, Felice; Massoli-Novelli, Raniero

1992-05-01

431

Lead isotopes as seepage indicators around a uranium tailings dam  

SciTech Connect

Lead isotope ratios and lead concentrations have been measured in water from 26 bores around the Ranger uranium tailings dam, Northern Territory, Australia, and from the dam itself to determine possible migration of lead derived from the radioactive decay of uranium. Lead isotope compositions have also been measured for the particulates retained on selected filters. The concentration of lead in the bore waters is extremely low (usually < 1 ppb). The /sup 206/Pb//sup 204/Pb ratio measured in the bore waters differs by more than a factor of 100 from that in the tailings dam and shows no evidence of lead derived from a significant uranium accumulation. It may be possible to distinguish between lead from the tailings dam and that derived from a nearby uranium ore body.

Gulson, B.L.; Mizon, K.J.; Korsch, M.J.; Noller, B.N.

1989-03-01

432

17. General view of dam and headworks, looking northeast. Photo ...  

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

17. General view of dam and headworks, looking northeast. Photo by Brian C. Morris, Puget Power, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

433

21. Detail of dam and flashboards, looking north. Photo by ...  

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

21. Detail of dam and flashboards, looking north. Photo by Brian C. Morris, Puget Power, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

434

18. View, looking south, of low crib dam and headworks ...  

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

18. View, looking south, of low crib dam and headworks from north side of White River. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

435

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

436

21 CFR 872.6300 - Rubber dam and accessories.  

Code of Federal Regulations, 2010 CFR

...rubber dam clamp. This classification does not include devices intended for use in preventing transmission of sexually transmitted diseases through oral sex; those devices are classified as condoms in § 884.5300 of this chapter. (b)...

2010-04-01

437

21 CFR 872.6300 - Rubber dam and accessories.  

...rubber dam clamp. This classification does not include devices intended for use in preventing transmission of sexually transmitted diseases through oral sex; those devices are classified as condoms in § 884.5300 of this chapter. (b)...

2014-04-01

438

21 CFR 872.6300 - Rubber dam and accessories.  

Code of Federal Regulations, 2013 CFR

...rubber dam clamp. This classification does not include devices intended for use in preventing transmission of sexually transmitted diseases through oral sex; those devices are classified as condoms in § 884.5300 of this chapter. (b)...

2013-04-01

439

21 CFR 872.6300 - Rubber dam and accessories.  

Code of Federal Regulations, 2012 CFR

...rubber dam clamp. This classification does not include devices intended for use in preventing transmission of sexually transmitted diseases through oral sex; those devices are classified as condoms in § 884.5300 of this chapter. (b)...

2012-04-01

440

21 CFR 872.6300 - Rubber dam and accessories.  

Code of Federal Regulations, 2011 CFR

...rubber dam clamp. This classification does not include devices intended for use in preventing transmission of sexually transmitted diseases through oral sex; those devices are classified as condoms in § 884.5300 of this chapter. (b)...

2011-04-01

441

View of Diversion Dam and Flume Intake of the Childs ...  

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

View of Diversion Dam and Flume Intake of the Childs System at the Irving Powerhouse. Looking northwest - Childs-Irving Hydroelectric Project, Childs System, Flume Intake & Forebay, Forest Service Road 708/502, Camp Verde, Yavapai County, AZ

442

Aquatic Toxicity of the Decontamination Agent: Multipurpose (DAM) Decontamination Solution.  

National Technical Information Service (NTIS)

A new formulation, Decontaminating Agent: Multipurpose (DAM) Decontamination Solution, is being considered as a replacement to the DS-2 decontaminating solution. The new formulation is composed of calcium hypochlorite and N-cyclohexyl-2-pyrrolidinone. Sin...

M. V. Haley, C. W. Kurnas, N. A. Chester, W. T. Muse

1994-01-01

443

Landslide Dams in the Central Andes of Argentina (Northern Patagonia and the Argentine Northwest)  

Microsoft Academic Search

\\u000a Landslide dams are frequent phenomena in the Argentine Andes. We studied 20 landslide dams in NW Argentina and 41 landslide\\u000a dams in northern Patagonia. These examples show that most of the landslide dams in both regions have longevity of several\\u000a hundred to several tens of thousands of years. In those cases where the mode of dam erosion\\/breach was reconstructable it

Reginald L. Hermanns; Andres Folguera; Ivanna Penna; Luis Fauqué; Samuel Niedermann

444

Channel Adjustment Downstream of the Hapcheon Re-regulation Dam in South Korea  

Microsoft Academic Search

The Hwang River is a tributary of the Nakdong River as it covers a drainage area of 1,329 km2 in South Korea. The Hwang River has experienced channel adjustments after the construction of two dams. The Hapcheon dam and re-regulation dam, located 2 km downstream of the main dam, were completed in 1989. The purpose of the lower dam is

Young Ho Shin; Pierre Y. Julien

2007-01-01

445

Water leakage paths in the Doosti Dam, Turkmenistan and Iran  

Microsoft Academic Search

The Doosti Dam, with a reservoir capacity of 1,250 million cubic meters, was constructed on the Harirood River at the border\\u000a of Turkmenistan and Iran. The reservoir is in direct contact with permeable formations on the right abutment of the dam including\\u000a the Neyzar Sandstone, the Kalat Limestone and the Pesteleigh alternative layers of marlstone and sandstone. After the reservoir

Morteza Mozafari; Ezzatollah Raeisi; Mohammad Zare

446

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

447

Right-bank earth dam of the Bratsk hydroelectric station  

Microsoft Academic Search

Conclusions 1.The right-bank earth dam is working satisfactorily, but there are processes which require greater attention.2.Settlement of the dam for the most part is diminishing, but it has still not ended. Consolidation of the loose layers of the foundation is continuing.3.The overall seepage regime is stable in time. The piezometric levels and discharges are staying within certain limits at the

Yu. A. Zhebelev; Z. I. Solov'eva

1984-01-01

448

Failure analysis of the granite for a dam foundation  

Microsoft Academic Search

This paper presents the numerical and experimental investigation of a dam foundation. The site consists of granite and especially\\u000a weathered granite. Numerical and analytical analyses have been conducted to evaluate suitability of the granite for a dam\\u000a foundation. Mohr–Coulomb failure criterion has been used to calculate the compressive strength of the rock mass. Finite element\\u000a implementation of Mohr–Coulomb criterion has

Haydar Arslan; Leonardo Rosassanchez

2008-01-01

449

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

450

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

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

Oblique view, looking west-southwest, of top side of diversion dam, showing roller gate operating mechanism (within pier recess) and lift mechanism (within gatehouse). Service bridge is on right, and 60-foot-long roller gate (raised position) over sluiceway is on left - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

451

A Web GIS Application for Dams and Drought in India  

Microsoft Academic Search

Dams and diversion are built in India for meeting needs of water and energy. Due to variability of monsoon in space and time,\\u000a precipitation falls short or exceeds causing in extreme cases drought and floods respectively. Water resource planners and\\u000a engineers need information on dams and diversion. Drought information is needed in disaster management. For dissemination\\u000a of these spatial data,

Devendra Singh Rathore; Deepa Chalisgaonkar; R. P. Pandey; Tanvear Ahmad; Yatveer Singh

2010-01-01

452

Emergy evaluation perspectives of a multipurpose dam proposal in Korea.  

PubMed

The 'emergy' concept was used to evaluate the economy of Korea and the contributions of a multipurpose dam proposal to the real wealth of the Korean economy. Emergy is defined as the available energy of one kind previously used up directly and indirectly to make a product or service. The indices for Korea calculated from the emergy evaluation were close to those of developed countries. Even though its monetary balance of payments was negative in 1997, the economy of Korea showed positive balance in trade when exports and imports were expressed in emergy. The emergy evaluation showed that the Korean economy places a large stress on its environment. Water supply and generation of electricity were the most important contributions of the proposed dam in terms of emergy; 46.5 and 45.1% of the total benefit, respectively. Flood control contributed 8.4% of the total benefit. Major costs associated with the proposed dam were from sediments (33.2% of the total cost), construction services (22.8%), and social disruption of the region (21.6%). In terms of emergy, the ratio of benefits to costs of the proposed dam was 2.78 if sediments are not included, and 1.86 if sediments are included, which result in more benefits than costs in both cases. The benefit to cost ratio of the dam was larger than that of the current system (1.42) without the dam whether sediments are included in the total cost or not. The environmental stress of the proposed dam was considerably lower than that of the Korean economy, but the dam might increase stress on local environment. PMID:12448407

Kang, Daeseok; Park, Seok Soon

2002-11-01

453

A comparison of different rubber dam systems on a dental simulator.  

PubMed

The purpose of this study was to test the hypothesis that more recently developed rubber dam systems (OptraDam ® Plus and OptiDam™) are faster and easier to handle, and that the quality of isolation is not decreased. The rubber dam systems were applied in standard conditions on a dental simulator in several model clinical situations. The time of preparation, application and removal were measured and the quality of isolation was evaluated. The median time of rubber dam placement was 51 s (Q1 = 38 s; Q3 = 79 s). The shortest median time of application was with OptiDam™ (42 s), followed by a conventional rubber dam (53 s), and finally the longest was with OptraDam® Plus (58 s). The median volume of fluid remaining in the isolated space after 5 minutes was 9.5 mL (Q1 = 8 mL; Q3 = 10 mL). The largest median volume of remaining water was with OptiDam™ (10 mL), followed by a conventional rubber dam (9.5 mL) and the least with OptraDam® Plus (8.5 mL). The afore-stated hypothesis about the advantages of modern rubber dam isolation systems was accepted for OptiDam™, but rejected for OptraDam® Plus. The results could contribute to decision-making concerning the choice of rubber dam system. PMID:25006658

Kapitan, Martin; Sustova, Zdenka; Ivancakova, Romana; Suchanek, Jakub

2014-01-01

454

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

455

Guidelines for Assessing Sediment-Related Effects of DAM Removal  

NASA Astrophysics Data System (ADS)

Dam removal is becoming more common in the United States as dams age and environmental concerns increase. Sediment management is an important part of many dam removal projects, but there are no commonly accepted methods to assess the level of risk associated with sediment stored behind dams. Therefore, the interagency Subcommittee on Sedimentation (SOS) is sponsoring the development of a decision framework for assessing sediment-related effects from dam removals. The decision framework provides guidance on the level of sediment data collection, analysis, and modeling needed for reservoir sediment management. The framework is based on criteria which scale the characteristics of the reservoir sediment to sediment characteristics of the river on which the reservoir is located. To assist with the framework development, workshops of invited technical experts from around the United States were convened October 2008 in Portland, Oregon and October 2009 in State College, Pennsylvania. The decision framework developed at these workshops is currently being validated with actual dam-removal case studies from across the United States including small, medium, and large reservoir sediment volumes. This paper provides the latest thinking on key components of the guidelines. The paper represents contributions from over 26 entities who have participated in the development of the guidelines. After completion of the case study application, the framework will be finalized and published.

Greimann, B. P.; Randle, T.; Bountry, J.

2010-12-01

456

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

457

Channel response to dam removal, Clear Creek, California  

NASA Astrophysics Data System (ADS)

Clear Creek drains 720 km2, joining the Sacramento River south of Redding, California. The 4.6-m high Saeltzer Dam blocked upstream migration of chinook salmon (Oncorhynchus tshawytscha) since it was built in 1912 to divert water for irrigation. Saeltzer Dam was removed in 2000 to restore anadromous fish access to upstream reaches. Before the dam was taken down, 19,000 m3 of sediment stored behind the dam was mechanically removed, but substantial deposits remained. A 2001 survey (Stillwater Sciences and University of California Davis 2001) detected little channel change in the former reservoir area over the 2001 flow season (peak flow 35 m3s-1). We resurveyed the channel in 2003 (peak flow 130 m3s-1). Our survey documented post 2001 incision of more than 1 m, over about 320 m upstream of the former dam site to an active headcut, and lateral erosion of 15-18 m, for total erosion of over 3000 m3 from the former reservoir deposit. Dam removal has led to desiccation of riparian trees (mostly Alnus spp.), with over 50 trees visibly dead or dying, and lateral bank erosion has removed more trees.

Miller, P.; Kondolf, G. M.; Ferry, M.

2003-12-01

458

Quantifying and generalizing hydrologic responses to dam regulation using a statistical modeling approach  

NASA Astrophysics Data System (ADS)

Despite the ubiquitous existence of dams within riverscapes, much of our knowledge about dams and their environmental effects remains context-specific. Hydrology, more than any other environmental variable, has been studied in great detail with regard to dam regulation. While much progress has been made in generalizing the hydrologic effects of regulation by large dams, many aspects of hydrology show site-specific fidelity to dam operations, small dams (including diversions), and regional hydrologic regimes. A statistical modeling framework is presented as a predictive tool to quantify and generalize hydrologic responses to varying degrees of dam regulation at large spatial scales. In addition, the approach provides a method to expand sample sizes beyond that of traditional dam-hydrologic-effect analyses. Model performance was relatively poor with models explaining 10-31% of the variation in hydrologic responses. However, models had relatively high accuracies (61-89%) in classifying the direction of hydrologic responses as negative or positive. Responses of many hydrologic indices to dam regulation were highly dependent upon regional hydrology, the purpose of the dam, and the presence of diversion dams. In addition, models revealed opposite effects of dam regulation in systems regulated by individual dams versus many upstream dams, suggesting that the effects of dams may be countered by other dams in basins experiencing intensified cumulative disturbance. Results also suggested that particular contexts, including multipurpose dams, high cumulative regulation, diversions, and regions of unpredictable hydrology are all sources of increased error when predicting hydrologic responses to dams. Statistical models, such as the ones presented herein, show promise in their ability to generalize the directionality of hydrologic responses to dam regulation and provide parameter coefficients to inform future site-specific modeling efforts.

McManamay, Ryan A.

2014-11-01

459

Envir202b Earth, Air, Water: the Human Context Winter 2003 F. Stahr The River Dammed: Proposed Removal of the Lower Snake River Dams A Case Study  

E-print Network

Removal of the Lower Snake River Dams ­ A Case Study Assignment & Schedule for Day 2 We will next workEnvir202b ­ Earth, Air, Water: the Human Context Winter 2003 F. Stahr The River Dammed: Proposed as your group will be asked to answer the following questions: 1) What changes (if any) to the dams

460

Temporary Restoration of Bull Trout Passage at Albeni Falls Dam  

SciTech Connect

This study was designed to monitor movements of bull trout that were provided passage above Albeni Falls Dam, Pend Oreille River. Electrofishing and angling were used to collect bull trout below the dam. Tissue samples were collected from each bull trout and sent to the U. S. Fish and Wildlife Service Abernathy Fish Technology Center Conservation Genetics Lab, Washington. The DNA extracted from tissue samples were compared to a catalog of bull trout population DNA from the Priest River drainage, Lake Pend Oreille tributaries, and the Clark Fork drainage to determine the most probable tributary of origin. A combined acoustic radio or radio tag was implanted in each fish prior to being transported and released above the dam. Bull trout relocated above the dam were able to volitionally migrate into their natal tributary, drop back downstream, or migrate upstream to the next dam. A combination of stationary radio receiving stations and tracking via aircraft, boat, and vehicle were used to monitor the movement of tagged fish to determine if the spawning tributary it selected matched the tributary assigned from the genetic analysis. Seven bull trout were captured during electrofishing surveys in 2008. Of these seven, four were tagged and relocated above the dam. Two were tagged and left below the dam as part of a study monitoring movements below the dam. One was immature and too small at the time of capture to implant a tracking tag. All four fish released above the dam passed by stationary receivers stations leading into Lake Pend Oreille and no fish dropped back below the dam. One of the radio tags was recovered in the tributary corresponding with the results of the genetic test. Another fish was located in the vicinity of its assigned tributary, which was impassable due to low water discharge at its mouth. Two fish have not been located since entering the lake. Of these fish, one was immature and not expected to enter its natal tributary in the fall of 2008. The other fish was large enough to be mature, but at the time of capture its sex was unable to be determined, indicating it may not have been mature at the time of capture. These fish are expected to enter their natal tributaries in early summer or fall of 2009.

Paluch, Mark; Scholz, Allan; McLellan, Holly [Eastern Washington University Department of Biology; Olson, Jason [Kalispel Tribe of Indians Natural Resources Department

2009-07-13

461

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

462

Close-range photogrammetric reconstruction of moraine dam failures  

NASA Astrophysics Data System (ADS)

Glacial Lake Outburst Floods (GLOFs) from moraine-dammed lakes represent a high magnitude, low frequency catastrophic glacio-fluvial phenomena, with the potential to cause significant damage to property and infrastructure in high-mountain regions. Detailed accounts of GLOF dynamics, in particular the initiation and propagation of dam breaching are extremely rare, owing to their occurrence in often remote, inaccessible areas, as well as the impracticalities associated with attempting to directly instrument such high magnitude, turbulent flows. In addition to the dearth of detailed, first-hand observations of dam failures, reconstruction of breaches and failure mechanisms derived from morphological evidence is hampered by the lack of high-quality, high-resolution DTMs of remote alpine areas. Previous studies have therefore resorted to the use of coarse resolution data products (SRTM, ASTER GDEM) to quantify characteristics of failure events, e.g. pre-flood lake volume, dam height/width, which may give rise to considerable uncertainty in related numerical simulations and assessments of downstream flood hazards. In this paper we employ a novel low-cost, close-range photogrammetric technique, termed 'Structure-from-Motion' (SfM) to provide detailed in-situ reconstructions of dam and valley topography for two moraine dam complexes which have produced historical GLOFs in the Khumbu Himal, Nepal. Requiring little more than a consumer-grade digital camera and suitable ground control for implementation, the resolution of the final data products are comparable to that obtained using ground-based or airborne LiDAR. These data facilitate the extraction of precise estimates of dam (and breach) geometry, volumes of water and sediment removed during the outburst events, and the downstream channel topography. We conclude by directly comparing such key metrics derived from low-resolution topographic datasets, with those acquired in situ using the SfM technique, and discuss the implications for the reconstruction of flood dynamics.

Westoby, M. J.; Brasington, J.; Glasser, N. F.; Hambrey, M. J.; Reynolds, J. M.

2012-04-01

463

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

464

Cover photo descriptions: 1. (upper left) View from the left bank of the Yuba River at Daguerre Point Dam, looking across from Daguerre Point Dam. M.P. Hunerlach, 2001.  

E-print Network

fluctuations and human activities, is vital to evalu- ating effects of forest land use, dams, diversions . . . . . . . . . . . . . . . . . .2 The Allocation Challenge . . . . . . . . . . . . . .3 Dam the Consequences, dam relicensing, and whole watershed management. In western Oregon, the Forest Service sits squarely

465

Campus Construction Situation Report #4 February 29th, 2012 Hechenbleikner Lake Dam --Dewatering maintenance continues. Major construction activity will  

E-print Network

Campus Construction Situation Report #4 ­ February 29th, 2012 Hechenbleikner Lake Dam -- Dewatering Report #3 ­ February 24, 2012 Hechenbleikner Lake Dam -- Dewatering maintenance continues. Major . Campus Construction Situation Report #2 ­ February 16, 2012 Hechenbleikner Lake Dam -- Dewatering

Chen, Keh-Hsun

466

Flood hydrology and dam-breach hydraulic analyses of five reservoirs in Colorado  

USGS Publications Warehouse

The U.S. Department of Agriculture Forest Service has identified hazard concerns for areas downstream from five Colorado dams on Forest Service land. In 2009, the U.S. Geological Survey, in cooperation with the Forest Service, initiated a flood hydrology analysis to estimate the areal extent of potential downstream flood inundation and hazard to downstream life, property, and infrastructure if dam breach occurs. Readily available information was used for dam-breach assessments of five small Colorado reservoirs (Balman Reservoir, Crystal Lake, Manitou Park Lake, McGinnis Lake, and Million Reservoir) that are impounded by an earthen dam, and no new data were collected for hydraulic modeling. For each reservoir, two dam-breach scenarios were modeled: (1) the dam is overtopped but does not fail (break), and (2) the dam is overtopped and dam-break occurs. The dam-breach scenarios were modeled in response to the 100-year recurrence, 500-year recurrence, and the probable maximum precipitation, 24-hour duration rainstorms to predict downstream flooding. For each dam-breach and storm scenario, a flood inundation map was constructed to estimate the extent of flooding in areas of concern downstream from each dam. Simulation results of the dam-break scenarios were used to determine the hazard classification of the dam structure (high, significant, or low), which is primarily based on the potential for loss of life and property damage resulting from the predicted downstream flooding.

Stevens, Michael R.; Hoogestraat, Galen K.

2013-01-01

467

Modeling the costs and benefits of dam construction from a multidisciplinary perspective.  

PubMed

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 biophysical, socio-economic, and geopolitical implications of dams. To meet the simultaneous demands for water, energy, and environmental protection well into the future, a broader view of dams is needed. We thus propose a new tool for evaluating the relative costs and benefits of dam construction based on multi-objective planning techniques. The Integrative Dam Assessment Modeling (IDAM) tool is designed to integrate biophysical, socio-economic, and geopolitical perspectives into a single cost/benefit analysis of dam construction. Each of 27 different impacts of dam construction is evaluated both objectively (e.g., flood protection, as measured by RYI years) and subjectively (i.e., the valuation of said flood protection) by a team of decision-makers. By providing a visual representation of the various costs and benefits associated with two or more dams, the IDAM tool allows decision-makers to evaluate alternatives and to articulate priorities associated with a dam project, making the decision process about dams more informed and more transparent. For all of these reasons, we believe that the IDAM tool represents an important evolutionary step in dam evaluation. PMID:18995948

Brown, Philip H; Tullos, Desiree; Tilt, Bryan; Magee, Darrin; Wolf, Aaron T

2009-07-01

468

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, T.V., II; Berenbrock, C.E.; Freckleton, J.R.; Guymon, G.L.

1985-01-01

469

Morphological adjustment monitoring after dam removals: Urumea and Leitzaran Rivers  

NASA Astrophysics Data System (ADS)

Dam removal has been demonstrated as one of the most frequent and effective fluvial restoration actions. The results of the geomorphological monitoring implemented in two dams in Urumea and Leitzaran Rivers (northern Spain) are presented. The first one was removed completely whereas the second one is being removed in 4 different phases. Changes in channel morphology, sediment size and mobility and river bed morphologies were assessed. Geomorphological variables and field measurements were adapted to the local characteristics of the channel and river typology. The monitoring included different techniques: topographical measurements of the channel, terrestrial laser scanner measurements of river bed and sediment bars, sediment size, transport and hardness assessment and geomorphological mapping. Channel morphological adjustment was mainly given just after dam removals and flood events reactivated geomorphological processes and morphological changes.

Ibisate, Askoa; Ollero, Alfredo; Acín, Vanesa; Ballarín, Daniel; Granado, David; Mora, Daniel; Mesanza, Amaia

2014-05-01

470

Feasibility report on the potential hydroelectric development at Combie Dam  

NASA Astrophysics Data System (ADS)

The power plant would utilize flows which presently pass over the dam's spillway. The project would involve expanding the existing four foot diameter outlet on the southern gravity portion of the dam, installing a penstock and constructing a 3500 kilowatts (kW) power plant on the south bank of the river below the dam. The capital cost of the project, including interest during construction, would total approximately $4,500,000 in July 1980 Dollars. The unit capacity cost of the project at the 1980 price level would be $1,285 per kilowatt. The energy production unit cost would be 41.4 mills per kilowatt hour in 1980, and 56.3 mills per kilowatt hour in 1984. The primary conclusion is that the project is economically, environmentally and institutionally viable, and continued escalation of energy values will make this project even more attractive.

1980-10-01

471

Accumulation of allochthonous sediment and litter on a sediment bar subject to sand release from an upstream dam  

Microsoft Academic Search

Release of trapped sediment from a dam is currently considered to be an effective mitigation method in dammed rivers. However,\\u000a it has a high impact on the ecosystems downstream. In order to mitigate the impact of the sediment trapped by these dams,\\u000a sediment gates were constructed in the two most downstream dams—Dashidaira Dam and Unazuki Dam—to release trapped sediment\\u000a into

Kentaro SakamotoHideaki Sekine; Hideaki Sekine; Takayuki Kawashima

2010-01-01

472

Merowe Dam and the inundation of paleochannels of the Nile  

E-print Network

The course of the Nile in northern Sudan follows a contorted path through bedrocks, creating the Great Bend. Few years ago, the satellite images showed a fertile strip of land with villages, where paleochannels of the river hosted many fields with cultivations and archaeological sites. Now, a huge part of this valley is under the waters of Merowe Dam reservoir. Comparing the images of the region before and after the dam gates were closed, we can see that the reservoir created itself through flooding the paleochannels.

Sparavigna, Amelia Carolina

2010-01-01

473

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

474

Modern design and technological solutions for earthquakeproof gravity dams  

Microsoft Academic Search

Conclusion  An analysis of the characteristics of modern design and technological solutions used for earthquakeproof concrete dams, experience\\u000a of their construction and operation, and generalization of the results of investigations in recent years in the area of design,\\u000a technology, and materials for hydrotechnical construction lead to the following conclusions.\\u000a \\u000a \\u000a \\u000a \\u000a \\u000a 1) \\u000a \\u000a Gravity dams should be recommended for construction in seismically hazardous regions,

V. B. Sudakov; A. N. Marchuk; A. V. Karavaev

1996-01-01

475

Stress conditions in rock foundations of concrete gravity dams  

Microsoft Academic Search

Conclusions  \\u000a \\u000a \\u000a \\u000a 1. \\u000a \\u000a The results of theoretical and experimental investigations and data from full-scale observations indicate that even in the\\u000a case of sufficiently high safety factors in dams and absence of tensile stresses in the concrete-rock interface, a zone of\\u000a tensile stresses below the interface is almost always developed, which at some dams leads to damage of the impervious curtains\\u000a and

Yu. A. Fishman

1975-01-01

476

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

477

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

478

30 CFR 715.18 - Dams constructed of or impounding waste material.  

Code of Federal Regulations, 2010 CFR

...0 (iv) The dam, foundation, and abutments shall be stable under all conditions...Seepage through the dam, foundation, and abutments shall be controlled to prevent excessive uplift pressures, internal erosion, sloughing,...

2010-07-01

479

30 CFR 717.18 - Dams constructed of or impounding waste material.  

Code of Federal Regulations, 2010 CFR

...0 (iv) The dam, foundation, and abutment shall be stable under all conditions...Seepage through the dam, foundation, and abutments shall be controlled to prevent excessive uplift pressures, internal erosion, sloughing,...

2010-07-01

480

76 FR 20707 - Cle Elum Dam Fish Passage Facilities and Fish Reintroduction Project; Kittitas County, WA  

Federal Register 2010, 2011, 2012, 2013

...of Reclamation [INT-FES 11-02] Cle Elum Dam Fish Passage Facilities and Fish Reintroduction Project; Kittitas County, WA AGENCY...Environmental Impact Statement (FEIS) for the Cle Elum Dam Fish Passage Facilities and Fish Reintroduction...

2011-04-13

481

The distribution of dams in Costa Rica and their hydrologic impacts  

E-print Network

compared to temperate regions. However, this analysis revealed that two dams, Arenal and Sandillal, are having a disproportionately significant impact on their individual basins. Analysis of flow regime for individual dams followed standard hydrologic...

Laurencio, Laura Richards

2006-04-12

482

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

483

55. Photocopy of a photograph1921 PANORAMA OF 1913 DAM LOOKING ...  

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

55. Photocopy of a photograph--1921 PANORAMA OF 1913 DAM LOOKING EAST - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

484

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

485

54. Photocopy of a photograph1921 PANORAMA OF 1913 DAM FROM ...  

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

54. Photocopy of a photograph--1921 PANORAMA OF 1913 DAM FROM ISLAND POWER PLANT - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

486

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

487

Large dams and alluvial rivers in the Anthropocene: The impacts of the Garrison and Oahe Dams on the Upper Missouri River  

USGS Publications Warehouse

The Missouri River has had a long history of anthropogenic modification with considerable impacts on river and riparian ecology, form, and function. During the 20th century, several large dam-building efforts in the basin served the needs for irrigation, flood control, navigation, and the generation of hydroelectric power. The managed flow provided a range of uses, including recreation, fisheries, and habitat. Fifteen dams impound the main stem of the river, with hundreds more on tributaries. Though the effects of dams and reservoirs are well-documented, their impacts have been studied individually, with relatively little attention paid to their interaction along a river corridor. We examine the morphological and sedimentological changes in the Upper Missouri River between the Garrison Dam in ND (operational in 1953) and Oahe Dam in SD (operational in 1959). Through historical aerial photography, stream gage data, and cross sectional surveys, we demonstrate that the influence of the upstream dam is still a major control of river dynamics when the backwater effects of the downstream reservoir begin. In the “Anthropocene”, dams are ubiquitous on large rivers and often occur in series, similar to the Garrison Dam Segment. We propose a conceptual model of how interacting dams might affect river geomorphology, resulting in distinct and recognizable morphologic sequences that we term “Inter-Dam sequence” characteristic of major rivers in the US.

Skalak, Katherine;Benthem, Adam J.;Schenk, Edward R.;Hupp, Cliff R.;Galloway, Joel M.;Nustad, Rochelle A.;Wiche, Gregg J.

2013-01-01

488

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

489

An investigation into the seismic behaviour of dams using dynamic centrifuge modelling  

Microsoft Academic Search

Dynamic response of dams is significantly influenced by foundation stiffness and dam-foundation interaction. This in turn,\\u000a significantly effects the generation of hydrodynamic pressures on upstream face of a concrete dam due to inertia of reservoir\\u000a water. This paper aims at investigating the dynamic response of dams on soil foundation using dynamic centrifuge modelling\\u000a technique. From a series of centrifuge tests

S. Saleh; S. P. G. Madabhushi

2010-01-01

490

Liquefaction assessments by field-based methodologies: foundation soils at a dam site in Northeast Turkey  

Microsoft Academic Search

Recent examples show that strong earthquakes can cause damage to dams, notably tailings or hydraulic fill dams or relatively\\u000a small earth fill embankments. Liquefaction is known to be one of the most dangerous consequences of the dynamic loading of\\u000a an embankment dam and hence must be considered during the dam site selection and construction stages. This paper presents\\u000a the liquefaction

Resat Ulusay; Ergün Tuncay; Nilsun Hasancebi

2007-01-01

491

Application to monitoring of tailings dam based on 3D laser scanning technology  

NASA Astrophysics Data System (ADS)

This paper presented a new method of monitoring of tailing dam based on 3D laser scanning technology and gave the method flow of acquiring and processing the tailing dam data. Taking the measured data for example, the author analyzed the dam deformation by generating the TIN, DEM and the curvature graph, and proved that it's feasible to global monitor the tailing dam using 3D laser scanning technology from the theory and method.

Ren, Fang; Zhang, Aiwu

2011-06-01

492

Effects of dam size and nutritional plane during pregnancy on lamb performance to weaning  

Microsoft Academic Search

This study examined the effects of dam size and plane of nutrition during pregnancy on dam udder size, lamb colostrum intake, and lamb liveweight gain (LWG). The study also attempted to quantify the effects of a number of dam and offspring parameters on lamb LWG. Two hundred and fifty-five heavy (H) (60.8±0.18kg) and 255 light (L) (42.5±0.17kg) Romney dams were

P. R. Kenyon; D. S. van der Linden; H. T. Blair; S. T. Morris; C. M. C. Jenkinson; S. W. Peterson; D. D. S. Mackenzie; E. C. Firth

2011-01-01

493

Evidence for Fluoride Effects on Salmon Passage at John Day Dam, Columbia River, 1982–1986  

Microsoft Academic Search

There is evidence that fluoride from an aluminum plant near John Day Dam had a significant negative effect on passage time and survival of adult Pacific salmon Oncorhynchus spp. at the dam. In 1982, fluoride concentrations of 0.3-0.5 mg\\/L were recorded at the dam. These concentrations were probably representative of fluoride levels at the dam in earlier years as well,

David M. Damkaer; Douglas B. Dey

1989-01-01

494

Problems of friction posed by the use of geomembranes on dam slopes—examples and measurements  

Microsoft Academic Search

Two examples are presented of the use of geomembranes for the water- proofing of earth fill dams approximately 15 m high. These are, firstly, a PVC geomembrane used as an upstream facing on the Aubrac dam and, secondly, a bitumen membrane used as an internal core in the Valence d'Albi dam. A partial slip of the facing during the construction

H. Girard; S. Fischer; E. Alonso

1990-01-01

495

Slope Stability Analysis of Earth and Rockfill Dam by Numerical Modeling  

Microsoft Academic Search

The development in geotechnical engineering and the advancement in the earth moving machineries enabled the construction of high earth and rockfill dams. The construction of earth and rockfill dams has become more popular as they allow the use of available soil of different gradations in appropriate zones of dam cross section. Moreover the flexibility of the materials provides excellent seismic

Rajesh Khanna; R Chitra; Manish Gupta

496

Indirect Upstream Effects Of Dams: Consequences Of Migratory Consumer Extirpation In Puerto Rico  

Microsoft Academic Search

Large dams degrade the integrity of a wide variety of ecosystems, yet direct downstream effects of dams have received the most attention from ecosystem managers and researchers. We investigated indirect upstream effects of dams resulting from deci- mation of migratory freshwater shrimp and fish populations in Puerto Rico, USA, in both high- and low-gradient streams. In high-gradient streams above large

Effie A. Greathouse; Catherine M. Pringle; William H. McDowell; Jeff G. Holmquist

2006-01-01

497

The influence of large dams on surrounding climate and precipitation patterns  

E-print Network

formation are identified around the reservoir shoreline for 92 large dams of North America. Our study the reservoir shoreline and farther from these dams. Because of the increasing correlation observed between CAPE argued that very little is known on how artificial reservoirs (hereafter interchanged with `dam') modify

Niyogi, Dev

498

Enhanced durability performance of fly ash concrete for concrete-faced rockfill dam application  

Microsoft Academic Search

The main purpose of this research was to enhance the durability in both the design and construction of dams. Especially, in case of rockfill dams, the durability of face slab concrete in a concrete-faced rockfill dam (CFRD) is achieved by optimizing the fly ash replacement for cement. The effect on durability corresponding to the increasing replacement of fly ash was

Young-Soo Yoon; Jong-Pil Won; Sang-Kyun Woo; Young-Chul Song

2002-01-01

499

Influence of Sediment Condition on Water Quality in the Izarigawa Dam Reservoir  

Microsoft Academic Search

The water environment of dam reservoirs is greatly influenced by sediment inflow from upstream, weather, and hydrological conditions. The Izarigawa Dam was completed in 1980, and sedimentation has been progressing yearly. The volume of accumulated sediment was 840,000 m 3 as of 2002. A sediment shelf formed in the dam reservoir has been advancing and it became conspicuous in 1993,

Tetsuya YABIKI; Makoto NAKATSUGAWA; Yasuhiro MURAKAMI

500

Integrated watershed management: a planning methodology for construction of new dams in Ethiopia  

Microsoft Academic Search

Integrated watershed management (IWM) is emerging as an alternative to the centrally planned and sectoral approaches that currently characterize the planning process for dam construction in Ethiopia. This report clarifies the concept of IWM, and reviews the major social, environmental and economic problems caused by dams in Ethiopia and elsewhere. Dams are planned from a top-down perspective in Ethiopia, some

Tefera Bezuayehu; L. Stroosnijder

2007-01-01