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1

Itaipu: never underestimate the Latins. [Paraguay/Brazil binational project  

SciTech Connect

The Itaipu hydroelectric project, a joint effort of Brazil and Paraguay (with a cost of US $16 to 18 billion), will be finished in December 1989. The project is situated on the Parana River, 14 km beyond the Puente de da Amistad (Friendship Bridge), which connects the city Presidente Stroessner, in Paraguay, with Foz do Iguacu, in Brazil. It is considered today not only the biggest hydroelectric plant in the world, but also a great socio-economic boom in the making. Itaipu will add a total of 12.6-million kilowatt-hours (kWh) of hydroelectricity to the region, an equivalent of 600,000 barrels of oil daily (b/d). This issue of Energy Detente reviews the progress of Itaipu. Also appearing in this issue is the fuel price/tax series and the principal industrial fuel prices for April 1983 for countries of the Eastern Hemisphere.

Not Available

1983-04-06

2

Selected trace and minor elements in sediments of Itaipu dam reservoir  

NASA Astrophysics Data System (ADS)

The X-ray fluorescence analysis of some minor and trace elements in sediments of Itaipu Dam reservoir was used for a study of geochemical processes and the evolution and history of a water body, which characterise the geological history as well as the present changes in the area. Inter alia good correlation with the Ti and incompatible elements content in whole rock was found and that REEs can be used as provenance indicators.

Facetti-Masulli, J. F.; Kump, P.; de Diaz, Z. V.

2003-01-01

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

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

5

Fish diversity along spatial gradients in the Itaipu Reservoir, Paraná, Brazil.  

PubMed

Local and turnover patterns of fish diversity in the Itaipu Reservoir were evaluated and related to a longitudinal or river-dam gradient (composed of riverine, transitional, and lacustrine zones) and to transversal or upstream-downstream gradients of the tributaries (composed of lotic and lentic stretches of tributaries and reservoir shores). Thirteen stations were sampled quarterly during 2 years. A total of 85 fish species were caught. Local (alpha) and turnover (beta) patterns of fish diversity showed significant differences in reservoir spatial gradients. Along the longitudinal gradient, total and alpha-diversity were the highest in the riverine and transitional zones of the reservoir and lowest in the lacustrine zone. Along the transversal gradient, total and alpha-diversity increased from the lotic stretches of the tributaries to the reservoir shores. The lotic and lentic stretches of the tributaries presented the highest beta-diversity values, indicating heterogeneity in species compositions among the sub-basins. We conclude with recommendations for reservoir management based on the results of this study. PMID:15622842

Oliveira, E F; Goulart, E; Minte-Vera, C V

2004-08-01

6

Diet of Iheringichthys labrosus (Pimelodidae, Siluriformes) in the Itaipu Reservoir, Paraná River, Brazil-Paraguay  

Microsoft Academic Search

Iheringichthys labrosus is a secondary commercial fish species in the Itaipu Reservoir, but it is important in other reservoirs of the basin. However, little information exists about this species in the literature. The purpose of this study was to describe the diet of this species in the Itaipu Reservoir. Stomachs of 306 fishes were analyzed, collected from October 1994 to

Sara da Silva Abes; Angelo Antonio Agostinho; Edson Kiyoshi Okada; Luiz Carlos Gomes

2001-01-01

7

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

2012-09-27

8

Allozyme relationships in hypostomines (Teleostei: Loricariidae) from the Itaipu Reservoir, Upper Rio Paraná basin, Brazil.  

PubMed

In an allozyme electrophoresis survey of 15 hypostomine species from the Itaipu Hydroelectric Reservoir, 25 loci from 14 enzyme systems were scored. Allozyme data allowed recording diagnostic genetic markers for all species analyzed and for some species groups within Hypostomus, a taxon which is taxonomically still unresolved in the Upper Rio Paraná basin. The mean expected heterozygosity of the species was considerably variable and hypotheses to tentatively explain this variation are discussed. A cladogram based upon the allelic frequencies of the species analyzed was produced by the continuous maximum likelihood method: Rhinelepis aspera and M. parananus were separated from the species of Hypostominae by a long branch length. Pterygoplichthys anisitsi was the sister of all the representatives of the genus Hypostomus. Within Hypostomus, two main clades were produced: in the first, H. cochliodon was the sister of the species comprising the H. plecostomus group, and in the second, the tree showed the following relationships: (H. albopunctatus (H. regani + Hypostomus sp. 3) + (H. margaritifer (H. microstomus (Hypostomus sp. 1 (H. ternetzi + Hypostomus sp. 2)). Hypostomus ternetzi and Hypostomus sp. 2 are referred to here as representatives of the H. ternetzi group. PMID:15954498

Zawadzki, Cláudio Henrique; Renesto, Erasmo; dos Reis, Roberto Esser; Moura, Maurício Osvaldo; Mateus, Rogério Pincela

2005-03-01

9

Greenhouse Gas Emissions from a Hydroelectric Reservoir (Brazil’s Tucuruí Dam) and the Energy Policy Implications  

Microsoft Academic Search

Greenhouse gas emissions from hydroelectric dams are oftenportrayed as nonexistent by the hydropower industry, and havebeen largely ignored in global calculations of emissions fromland-use change. Brazil’s Tucuruí Dam provides an example with important lessons for policy debates on Amazonian development and on how to assess the global warming impact ofdifferent energy options. Tucuruí is better from the pointof view of

Philip M. Fearnside

2002-01-01

10

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

11

SPECIAL PROTECTION SCHEMES IN OPERATION AT ITAIPU POWER PLANT  

Microsoft Academic Search

SUMMARY Nowadays, the installed power capacity of Itaipu Power Plant is 14.000 MW, with a energy production around 90.000 GWh per year. This amount of energy makes the plant responsible for the supplying about 23% of Brazil and 90% of Paraguay electricity markets. Another parameter gives an idea of the dimension of the involved systems: only 6% of the energy

JOVITA G. CORRÊA DA SILVA; JOSÉ BENEDITO; MOTA JÚNIOR; ROBSON ALMIR DE OLIVEIRA; GREGÓRIO ACHA NAVARRO; MARCELINO PEREIRA DE ALMEIDA; FERNANDO VEGA DAHER; ALEXANDRE GONÇALVES LEITE; ITAIPU BINACIONAL

12

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

13

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

14

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

15

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

16

Environmental Impacts of Brazil's Tucuruí Dam: Unlearned Lessons for Hydroelectric Development in Amazonia  

Microsoft Academic Search

Brazil's Tucuruí Dam provides valuable lessons for improving decision-making on major public works in Amazonia and elsewhere.\\u000a Together with social impacts, which were reviewed in a companion paper, the project's environmental costs are substantial.\\u000a Monetary costs include costs of construction and maintenance and opportunity costs of natural resources (such as timber) and\\u000a of the money invested by the Brazilian government.

PHILIP M. FEARNSIDE

2001-01-01

17

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

18

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

19

Patterns of Local Circulation in the Itaipu Lake Area: Numerical Simulations of Lake Breeze.  

NASA Astrophysics Data System (ADS)

The lake-breeze circulation in the Itaipu region was investigated numerically using a nonhydrostatic version of the Topographic Vorticity Model. The area of study corresponds to a 100 km × 180 km rectangle, located on the Brazil-Paraguay border, with Itaipu Lake in its center. The characteristics of the lake breeze generated by the numerical experiments were consistent with the observations available in the area. The numerical experiments have shown that the land use effect is important in the spatial distribution of the lake-breeze circulation and that the topography contributes to modulating the breeze intensity, with the daytime valley-mountain circulation intensifying the lake breeze. However, the circulation pattern observed during daytime over the region is mainly due to the Itaipu Lake presence. The numerical results indicated that Itaipu Lake is able to generate and sustain a lake breeze, with 3.5 m s1 of maximum intensity and 1500-m depth, that propagates inland at 5.1 km h1 under typical undisturbed and calm-wind summer conditions.

Stivari, Sônia M. S.; de Oliveira, Amauri P.; Karam, Hugo A.; Soares, Jacyra

2003-01-01

20

Retrospective study of malaria prevalence and Anopheles genus in the area of influence of the Binational Itaipu Reservoir.  

PubMed

The importance of hydroelectric dams beside the human interchange in the maintenance of malarious foci and the occurrence of the Anopheles genus on the Binational Itaipu Reservoir were the main points of this retrospective study. Data were collected from existing registrations at National, State and Municipal Health Departments and literature systematic overview, from January 1984 to December 2003. The occurrence of some outbreak of malaria, mainly by Plasmodium vivax, and the prevalence of species of the Anopheles genus different from Anopheles darlingi in the region are discussed. The malaria in the left bank of Paraná River is a focal problem, which must be approached locally through health, educational and social actions to prevent the continuity of outbreaks in the area. Concomitantly, it is necessary to plan and apply effective surveillance measures in the influence area of the Itaipu Reservoir. PMID:15880218

Falavigna-Guilherme, Ana Lucia; Silva, Allan Martins da; Guilherme, Edson Valdemar; Morais, Dina Lúcia

2005-05-04

21

Optimal dispatch of generating units of the Itaipu hydroelectric plant  

Microsoft Academic Search

This paper is concerned with the optimal dispatch of generating units of Itaipu, the world's largest hydroelectric plant in operation. Itaipu is a 12.6 GW hydro plant, located on the Parana river, in South America, composed of 18 identical 700 MW generating units. A dynamic programming model has been developed to optimize the number of generating units in operation at

A. Arce; T. Ohishi; S. Soares

2002-01-01

22

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

23

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

24

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

25

Susceptibility of Biomphalaria straminea from Peixe Angical dam, Tocantins, Brazil to infection with three strains of Schistosoma mansoni.  

PubMed

Environmental changes from water resource developmental projects affect the epidemiology of water-associated diseases, as well as malaria and schistosomiasis. Aiming to investigate the occurrence and distribution of freshwater snails of medical and veterinary importance in the area of influence of the Peixe Angical hydroelectric dam, a survey has been conducted over four years (2004-2008). The study has revealed the occurrence of populations of Biomphalaria straminea (Dunker) in all municipalities surrounding the lake. Studies on parasite-mollusc compatibility were undertaken using 35 populations of B. straminea, descendants of specimens obtained from that area and three strains of Schistosoma mansoni (Sambon) (BH, CM and CMO). The main results are as follows: (i) among the 1,314 specimens used, eight had been infected (infection index of 0.6%) with only the BH strain, (ii) for B. straminea populations, the mortality index was 6.8% and, depending on the strain used, the indexes were 4.6%, 8.49% and 19% with BH, CM and CMO strains, respectively, (iii) the infection indexes varied according to the B. straminea populations, ranging from 0-12.5% and (iv) the duration of the precercarial period varied from 25-49 days. These results, in addition to environmental and social changes that took place in the Peixe Angical dam region, indicate the possibility of B. straminea emerging as a schistosomiasis vector in this area. PMID:20721496

Fernandez, Monica Ammon; Thiengo, Silvana Carvalho

2010-07-01

26

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

27

Cracking Dams  

NSDL National Science Digital Library

This is a comprehensive site that looks at many components of dams, including construction, destruction, and other issues. Access is organized into three levels by grade level. Information on cracks, case histories of the building and problems associated with some well known dams, and some real and imagined scenarios are included.

Polaha, Megann

28

Sediment grain size distribution and heavy metals determination in a dam on the Paraná River at Ilha Solteira, Brazil.  

PubMed

This paper reports on a preliminary evaluation of the grain size distribution of cadmium, lead and copper in sediment from Catarina Beach, Ilha Solteira, in the state of São Paulo, Brazil. Surface sediments were fractionated with <63 microm nylon sieves and subjected to three digestion procedures: the proposed open digestion, the standard USEPA-3050B and closed digestion in a Teflon tube. The metals were determined by atomic absorption spectrometry. The results of the three procedures showed no significant differences. The 309 mg Kg1 concentration of copper found at the P3 sampling point exceeded the PEL (probable effect level) value of 197 mg Kg1, which represents an environmental hazard to aquatic organisms. The sediments organic matter content determined by the loss on ignition was 6.8, 1.7 and 0.6% in the P3, P1 and P2 samples, respectively. The distribution of metal concentrations in sieved sediment followed the order P3 < P2 < P1 thereby suggesting an interaction with organic matter. PMID:19799055

Minello, Maria Clara S; Paçó, Ana L; Martines, Marco Antonio U; Caetano, Laercio; Dos Santos, Ademir; Padilha, Pedro M; Castro, Gustavo R

2009-07-15

29

Studies on entomological monitoring: mosquito species frequency in riverine habitats of the Igarapava Dam, Southern Region, Brazil.  

PubMed

Diversity of mosquito species was evaluated in different habitats before and after the Igarapava reservoir flooding in the Grande River, Southern Cerrado of Brazil. We aimed at verifying changes in these mosquito populations in consequence of the lake formation. Four habitats were selected as sampling stations: peridomiciliary habitat, pasture, "veredas" and gallery forest patch. Bimonthly collections were made with the Shannon trap and human bait, including diurnal, crepuscular and nocturnal period of mosquito activity. The Shannon Index results from the potential vectors were compared using Student t-test. Aedes scapularis, Anopheles darlingi and An. albitarsis senso latu seasonal abundance were described with moving average and compared using chi2 test. There were changes in the mosquito frequency in the habitats, except for the "veredas" that was 13 km away from the catchment area. The altering in mosquito species seasonal abundance suggests breeding places expansion. Diversity indexes can be used to monitor changes in mosquito vector population in environments where abrupt disturbance can alter disease transmission cycles. PMID:15361975

Tubaki, Rosa Maria; Menezes, Regiane Maria Tironi de; Cardoso, Rubens Pinto; Bergo, Eduardo Sterlino

2004-09-03

30

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

2012-07-10

31

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

32

Methane release below a tropical hydroelectric dam  

NASA Astrophysics Data System (ADS)

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

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

2007-06-01

33

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

34

Survey of microcystins in water between 1995 and 1996 in Paraná, Brazil using ELISA.  

PubMed

An enzyme-linked immunosorbent assay (ELISA) based on a monoclonal antibody was used to determine microcystin (MC) concentrations in water supplies and water plant samples collected between November 1995 and October 1996, from five regions of Paraná, Brazil. In addition, the presence of Microcystis sp. was monitored. Of the 50 samples obtained, 12 were from an urban lake, 8 from human water supplies, 10 from recreational lakes, 13 from farm waters used for animal pasture and 7 from aquaculture facilities. M. aeruginosa was positive in all locations. MCs were positive (>50 pg ml(-1)) in 9 samples (2 samples from human water supplies, 5 from recreational lakes and 2 from animal pasture). Heavy contamination with MCs was observed in water samples collected in May 1996 from 2 recreation (swimming-fishing sites at Itaipu dam, 6380 and 10,000 pg ml(-1)) and human supplies (6627 pg ml(-1)) samples. At these sites, a large bloom of Microcystis sp. was detected. Treatment with 1 ppm Cl- reduced MCs levels, although 267 pg ml(-1) remained in the water plant samples. Our data showed frequent occurrence of Microcystis sp., which may be a hazard to humans and animals in the state of Paraná. More detailed investigations are required to evaluate the risk of natural MC contamination in the water supplied in this region. PMID:10647512

Hirooka, E Y; Pinotti, M H; Tsutsumi, T; Yoshida, F; Ueno, Y

1999-01-01

35

DAM OVERTOPPING RESEARCH  

Technology Transfer Automated Retrieval System (TEKTRAN)

Aging of the watershed dams and development within the watersheds that have created changes in watershed hydrology have increased the potential for dam overtopping. Development around the dam and reservoir may increase the consequences of associated dam failure and, combined with financial constrai...

36

Geology and Dams. Volume V.  

National Technical Information Service (NTIS)

Contents: Kama Dam on river Kama; Kairakkum Dam on river Syr-Dar'ya; Head* Dam on river Vakhsh; Uch-Kurgan Dam on river Naryn; Lower-Bozsu Dam no. 4 on irrigational channel Lower-Bozsu; First Khrami Dam on the river Kharami; Dubossar Dam on r. Dniester; K...

A. A. Borovog

1971-01-01

37

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

Microsoft Academic Search

Development projects are rapidly changing the landscape in Brazilian Amazonia. Environmental impact assessments have been\\u000a required since 1986, and the regulatory system is evolving as precedents are set by each new development project. The Jatapu\\u000a Dam in Roraima provides an illustration of underlying impediments to assessment of environmental costs and to due consideration\\u000a being given to these assessments when decisions

Philip M. Fearnside; Reinaldo Imbrozio Barbosa

1996-01-01

38

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

39

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

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

Safety of Tailings Dams  

NSDL National Science Digital Library

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

2008-08-25

42

Hoover Dam Learning Packet.  

ERIC Educational Resources Information Center

This learning packet provides background information about Hoover Dam (Nevada) and the surrounding area. Since the dam was built at the height of the Depression in 1931, people came from all over the country to work on it. Because of Hoover Dam, the Colorado River was controlled for the first time in history and farmers in Nevada, California, and…

Bureau of Reclamation (Dept. of Interior), Washington, DC.

43

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

44

Hoover Dam Learning Packet.  

ERIC Educational Resources Information Center

|This learning packet provides background information about Hoover Dam (Nevada) and the surrounding area. Since the dam was built at the height of the Depression in 1931, people came from all over the country to work on it. Because of Hoover Dam, the Colorado River was controlled for the first time in history and farmers in Nevada, California, and…

Bureau of Reclamation (Dept. of Interior), Washington, DC.

45

Proceedings of Dam Safety Training Program.  

National Technical Information Service (NTIS)

The papers included are titled: Assessment of Instrumentation Data, Design of Concrete Dams, Instrumentation of Dams, TVA's Dam Safety Program, Design of Earth Dams, Hydrologic Design of Dams, Emergency Action Plans, TVA Dam Safety Studies and Project Reh...

D. T. Tanner R. C. Sloan C. D. Tockstein J. T. Price S. D. Stone

1985-01-01

46

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)

Dynamical downscaling of precipitation in a coastal area of northeastern Brazil.The region has a relatively low predictability of seasonal rainfall and the basin has a small area.Evaluation of an integrated modeling-forecasting system for rainfall-runoff-erosion.The simulated runoff and reservoir-stored volumes are strongly linked to rainfall.The system showed an acceptable performance for the monthly scale.

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

2013-08-01

47

Brazil.  

PubMed

Brazil's population in 1985 was 135 million, with an annual growth rate (1982) of 2.3%. The infant mortality rate (1981) was 92/1000, and life expectancy stood at 62.8 years. 76% of the adult population was literate. Brazil is a federal republic which recognizes 5 political parties. 55% of the population is Portuguese, Italian, German, Japanese, African, or American Indian; 38% is white. Of the work force of 50 million, 35% are engaged in agriculture, 25% work in industry, and 40% are employed in services. Trade union membership totals 6 million. The agricultural sector accounts for 12% of the GDP and 40% of exports. Brazil is largely self-sufficient in terms of food. The GDP was US$218 billion in 1984, with an annual growth rate of 4%. Per capita GDP was US$1645. Brazil's power, transportation, and communications systems have improved greatly in recent years, providing a base for economic development. High inflation rates have been a persistent problem. PMID:12178118

1985-09-01

48

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

49

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

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

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

50

Focusing attention on dam safety  

Microsoft Academic Search

When people think of hydropower, an image of a dam often comes to mind. Indeed, at most high-hazard dams, there is a hydro plant. A North American hydro industry survey shows that dams and their safety are a priority among project owners. The survey identified several recent dam safety activities: development of safety evaluation programs; dam rehabilitation for greater stability;

1992-01-01

51

Detecting dam failures  

SciTech Connect

This article describes efforts by Southern California Edison to meet Federal Energy Regulatory Commission requirements for unattended dam monitoring against failure. The topics include a description of the two dam systems, monitoring system design and operation including warning sirens for remote camping areas, and installation of the systems.

Knarr, C.M.; Barker, T.J.; McKenery, S.F. (Southern California Edison Co., Rosemead, CA (United States))

1994-06-01

52

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

53

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.

54

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...

55

1. GORGE HIGH DAM. THIS THIN ARCH DAM WITH A ...  

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

1. GORGE HIGH DAM. THIS THIN ARCH DAM WITH A GRAVITY SECTION IS THE THIRD DAM BUILT BY SEATTLE CITY LIGHT TO PROVIDE WATER FOR GORGE POWERHOUSE AND WAS COMPLETED IN 1961, 1989. - Skagit Power Development, Gorge High Dam, On Skagit River, 2.9 miles upstream from Newhalem, Newhalem, Whatcom County, WA

56

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

57

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

58

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

59

140. PLAN AND SECTION OF NEW DAM AND OLD DAM ...  

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

140. PLAN AND SECTION OF NEW DAM AND OLD DAM From Annual Report of 1872, Water Department of Philadelphia - Fairmount Waterworks, East bank of Schuylkill River, Aquarium Drive, Philadelphia, Philadelphia County, PA

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

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

62

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

63

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

64

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

2012-06-12

65

Dam health diagnosis and evaluation  

NASA Astrophysics Data System (ADS)

Based on the bionics principle in the life sciences field, we regard a dam as a vital and intelligent system. A bionics model is constructed to observe, diagnose and evaluate dam health. The model is composed of a sensing system (nerve), central processing unit (cerebrum) and decision-making implement (organism). In addition, the model, index system and engineering method on dam health assessment are presented. The proposed theories and methods are applied to evaluate dynamically the health of one concrete dam.

Wu, Zhongru; Su, Huaizhi

2005-06-01

66

Dam health diagnosis and evaluation  

Microsoft Academic Search

Based on the bionics principle in the life sciences field, we regard a dam as a vital and intelligent system. A bionics model is constructed to observe, diagnose and evaluate dam health. The model is composed of a sensing system (nerve), central processing unit (cerebrum) and decision-making implement (organism). In addition, the model, index system and engineering method on dam

Zhongru Wu; Huaizhi Su

2005-01-01

67

A Catalog of Italian Dams.  

National Technical Information Service (NTIS)

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

V. A. Romanova

1971-01-01

68

EARTH DAM OR SPILLWAY?  

Technology Transfer Automated Retrieval System (TEKTRAN)

Aging of the US water control and management infrastructure is increasing the likelihood that some dams will be overtopped during extreme floods. As structures approach their planned service life, sediment pools fill and continued sedimentation results in a reduction in the volume available for flo...

69

Lake Nyos Dam  

Microsoft Academic Search

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

S. J. Freeth

1988-01-01

70

CG-DAMS: Concrete gravity dam stability analysis software  

SciTech Connect

CG-DAMS is a finite element based program written specifically for the stability analysis of concrete gravity dams. The code automates the prediction and evaluation of cracking in the dam, along the dam-rock interface, and in the foundation using incremental nonlinear analysis techniques based on the smeared crack'' approach. Its primary application is in the computation of dam-rock interface sliding stability factors of safety. The automated procedure for crack propagation analysis replaces the trial-and-error cracked-base analysis method commonly used in gravity dam safety analyses. This Application manual of CG-DAMS illustrates, through sample problems, the many features of the software. Example problems illustrate the capabilities of both CG-DAMS-PC and CG-DAMS-ABAQUS. CG-DAMS-PC is a menu driven program that runs on 386/486 PCs under the DOS operating system (4 Megabytes RAM, 25 Megabytes of hard disk space). CG-DAMS-ABAQUS is a pre- and post-processor along with a concrete constitutive model and distributed load module that interfaces with the ABAQUS general purpose finite element program. The PC program contains thermal analysis capabilities, a rough crack constitutive model, and an interface to the CRFLOOD software not available with the ABAQUS version. The CG-DAMS-ABAQUS program contains time marching dynamic analysis capabilities not available with the PC program. Example analyses presented include static, pseudo dynamic, and time marching dynamic analyses. The manual also presents sensitivity evaluations on mesh size and foundation material strength. Comparisons are presented between CG-DAMS and gravity method calculations. Comparisons with other finite element software are included for the dynamic time history analyses.

Not Available

1993-01-01

71

Remediation of Tailings Dams  

Microsoft Academic Search

\\u000a Tailings are a waste product of mining activities. The ore is crushed in processing to a size less than 0.1 to 1.0 mm, the\\u000a metal content is removed, and the remaining product is called tailings. Normally, the tailings will be pumped as slurry to\\u000a a sedimentation pond that is surrounded by dams and, sometimes, natural heights that form a tailings

A. G. Benckert

72

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

73

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.

Joyce, S

1997-01-01

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

78 FR 62627 - Sam Rayburn Dam Rate  

Federal Register 2010, 2011, 2012, 2013

...Southwestern Power Administration Sam Rayburn Dam Rate AGENCY: Southwestern Power Administration...increases the power rate for the Sam Rayburn Dam (Rayburn) project pursuant to the Rayburn...Hydro Power and Energy Sold to Sam Rayburn Dam Electric Cooperative, Inc....

2013-10-22

77

Lightweight Concrete Dams on Rock Foundations.  

National Technical Information Service (NTIS)

The book gives the results of generalization and critical analysis of the experience of design, research, construction, and exploitation of lightweight concrete dams on rock foundations (gravity dams with expansion joints, prestressed concrete gravity dam...

L. V. Oleshkevich

1976-01-01

78

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

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

1999-04-01

80

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'

81

Steam generator nozzle dam system  

Microsoft Academic Search

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

1985-01-01

82

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

83

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

84

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

National Technical Information Service (NTIS)

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

D. C. Jackson C. B. Fraser

1992-01-01

85

A sustainable electricity blueprint for Brazil  

Microsoft Academic Search

Brazil, South America's largest country and leading energy consumer, faces the twofold challenge of energy and environmental security. More than 80% of Brazil's installed generating capacity of about 70,000 MW is hydroelectric, generated by the nation's 450 dams (BEN, 2005), which explains why Brazilian power generation is cleaner with regard to local pollutants and greenhouse gas emissions. On the other

Giulio Volpi; Gilberto Jannuzzi; Rodolfo Dourado; Maia Gomes

2006-01-01

86

The Three Gorges Dam: an ecological perspective  

Microsoft Academic Search

The Three Gorges Dam in China is the largest dam ever built. Its impacts on the biodiversity and ecologi- cal processes in the region are causing concern to ecologists worldwide. The dam and associated environ- mental alterations may result in a number of regional changes in terrestrial and aquatic biodiversity, as well as in ecosystem structure and functioning. The dam

Jianguo Wu; Jianhui Huang; Xingguo Han; Xianming Gao; Fangliang He; Mingxi Jiang; Zhigang Jiang; Richard B. Primack; Zehao Shen

2004-01-01

87

Cost allocation in dam removal project  

Microsoft Academic Search

In many countries, the dam is removed in consideration of several reasons such as safety. When removing a dam, the polluted sedimentation flowing out of the dam may have an impact to the environment of the river and sea. Thus, dam owners may prefer to wait its removal rather than remove now. This is because they are motivated to wait

Keishi Tanimoto

2003-01-01

88

NRC (Nuclear Regulatory Commission) Inventory of Dams.  

National Technical Information Service (NTIS)

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

G. E. Lear O. O. Thompson

1983-01-01

89

Natural Debris Dams and Debris-Dam Lakes  

NSDL National Science Digital Library

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

90

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

National Technical Information Service (NTIS)

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

1982-01-01

91

Deer Creek Dam, Dam, 1,204 feet/238 degrees from intersection of ...  

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

Deer Creek Dam, Dam, 1,204 feet/238 degrees from intersection of dam complex access road and U.S. Highway 189 to center of dam, 874 feet/352 degrees from Hydroelectric Powerplant (HAER UT-93-B) to center of dam, Charleston, Wasatch County, UT

92

Foundation studies for theodore roosevelt dam  

Microsoft Academic Search

Theodore Roosevelt Dam, on the Salt River northeast of Phoenix, Arizona, was originally constructed as an 85.3m-high arched masonry dam between 1903 and 1911. Modifications were completed in 1996, which included raising the dam 23.5 m for dam safety puroses and additional water supply. The dam is founded on Precambrian sandstone, siltstone, and dolomite. Occasional clay partings parallel the bedding,

G. A. Scott

1997-01-01

93

Lake Sherburne Dam Model Study.  

National Technical Information Service (NTIS)

In 1981, a proposal was made to raise the Lake Sherburne Dam crest elevation to increase the reservoir flood detention capabilities to meet IDF (inflow design flood) criteria. The discharge capacity of the existing tower structure under increased reservoi...

B. W. Mefford

1983-01-01

94

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

95

ALAMO DAM DEMONSTRATION RISK ASSESSMENT  

Microsoft Academic Search

A demonstration risk assessment was conducted on the 283-foot high rolled-earthfill Alamo Dam as part of a U.S. Army Corps of Engineers (USACE) Research and Development program. The existing dam and 19 structural risk reduction alternatives were evaluated for flood, earthquake and normal operating conditions. The paper summarizes the risk assessment process, results, findings and recommendations. It also provides an

David S. Bowles; Loren R. Anderson; Joseph B. Evelyn; Terry F. Glover; David M. Van Dorpe

1999-01-01

96

"U.S. Reclamation Service, Grand River Dam, topographical map of dam ...  

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

"U.S. Reclamation Service, Grand River Dam, topographical map of dam site and construction plant. September 15, 1914." - Grand Valley Diversion Dam, Half a mile north of intersection of I-70 & Colorado State Route 65, Cameo, Mesa County, CO

97

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

Federal Register 2010, 2011, 2012, 2013

...TENNESSEE VALLEY AUTHORITY Dam Safety Modifications at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams AGENCY: Tennessee Valley Authority...environmental impact statement (EIS) for the dam safety modifications at Cherokee,...

2013-08-29

98

Genetic parameters for weaning weight by age of dam for Brazilian Nellore  

Technology Transfer Automated Retrieval System (TEKTRAN)

The objective was to estimate genetic parameters by age of dam subclass for weaning weight of Nellore cattle raised on pasture in two regions of São Paulo State, Brazil, between 1975 and 2001. The data were from ABCZ / EMBRAPA and included 51,664 weights at 205 d (W205) from progeny of 24,996 cows....

99

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

100

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

101

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

102

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

103

Group prepares guidelines for documenting dam performance  

SciTech Connect

The Association of State Dam Safety Officials and the Center on the Performance of Dams at Stanford University later this summer expect to complete guidelines for reporting the performance of state, federal, and private dams: A working group of state and federal dam safety engineers and consultants is developing the guidelines to identify incidents that should be reported and to establish reporting requirements. The Federal Emergency Management Agency (FEMA) is funding preparation and publication of the guidelines. The guidelines are expected to expedite the process for reporting information on dam incidents in a timely and complete manner. Much the same as the health care industry compiles and evaluates data related to the incidence of disease and the benefits of treatment, a single standard for reporting the performance of dams in the US will help create a national information base on the occurrence and consequence of dam incidents. Currently, incidents involving dam performance are not reported on a regular basis. The guidelines will define dam incidents in terms of events of engineering interest that provide insights to the safety and structural or operational integrity of dams. Examples of incidents include the performance of a dam that experiences ground motion from a large earthquake, extreme spillway or dam overtopping, rehabilitations made to satisfy dam safety requirements, embankment sliding of an earthen dam, and improper operations that leads to damage downstream. When an incident occurs, the satisfactory or unsatisfactory performance of a dam will be reported, either by a state dam safety official, the owner of the dam, or the owner's engineer.

McCann, M.W. Jr. (Stanford Univ., CA (United States))

1993-06-01

104

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

105

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

106

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

107

7 CFR 1724.55 - Dam safety.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF AGRICULTURE ELECTRIC ENGINEERING, ARCHITECTURAL SERVICES AND DESIGN...the U.S. Army Corps of Engineers Engineering and Design Dam Safety Assurance Program...The U.S. Army Corps of Engineers Engineering and Design Dam Safety...

2013-01-01

108

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

109

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

110

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

111

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

112

Stability Analysis of Troy Lock and Dam,  

National Technical Information Service (NTIS)

Troy Lock, Dam, and Powerhouse are located on the Hudson River in upstate New York (Figure 1) 156 miles from New York Harbor. Troy Lock and Dam allows entrance to the New York Barge Canal which connects to the Great Lakes. This makes Troy Lock and Dam an ...

C. Pace

1987-01-01

113

Remotely installed steam generator nozzle dam system  

Microsoft Academic Search

The Busitech Remotely Installed Nozzle Dam System is for use in Westinghouse Design Nuclear Steam Generators (S\\/G). These Nozzle Dams are used to isolate the primary channel head of the S\\/G from the primary coolant loop during the refueling process. This paper addresses the attributes of these Nozzle Dams utilized in the Westinghouse Steam Generator and does not address the

C. Evans; J. Shah; R. Kaye

1990-01-01

114

ALLOWABLE OVERTOPPING OF EARTHEN DAMS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Aging of the nation’s flood control infrastructure has resulted in a need for reevaluation, and, in some instances rehabilitation, of existing earthen dams. Inadequate spillway capacity is often one of the deficiencies identified for these structures. Inadequate spillway capacity may be the result...

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

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

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

EMBANKMENT-DAM BREACH PARAMETERS.  

USGS Publications Warehouse

The study used data from 43 embankment-dam failures to develop equations that predict breach formation model parameters. These data include the failure mode, embankment characteristics, reservoir conditions at the time of failure, geometry of the final breach, and the time taken to form the breach. Regression equations were developed to predict (1) the average width of a trapezoidal breach, (2) the average side-slope factor of a trapezoidal breach, and (3) the breach formation time.

Froehlich, David, C.

1987-01-01

119

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

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

Remotely installed steam generator nozzle dam system  

SciTech Connect

The Busitech Remotely Installed Nozzle Dam System is for use in Westinghouse Design Nuclear Steam Generators (S/G). These Nozzle Dams are used to isolate the primary channel head of the S/G from the primary coolant loop during the refueling process. This paper addresses the attributes of these Nozzle Dams utilized in the Westinghouse Steam Generator and does not address the Nozzle Dams utilized in the Combustion Engineering or Babcock and Wilcox Steam Generators. This Nozzle Dam System has a remote installation option which will allow installation of the Nozzle Dam with zero entry into the S/G primary channel head. The advantages of this total system is a significant reduction in radiation exposure, manpower and time of installation.

Evans, C.; Shah, J. (BUSITECH, INC., Sandy Hook, CT (US)); Kaye, R. (Duke Power Co., Catawba Nuclear Station, Newport, SC (US))

1990-01-01

122

Hoover Dam: The American Experience Online  

NSDL National Science Digital Library

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

1999-01-01

123

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

124

Hungry Horse Dam`s successful selective withdrawal system  

SciTech Connect

Remodeled intake structures operating with computer precision at the Bureau of Reclamation`s Hungry Horse Dam hydropower plant in Montana now maintain downstream river water at its natural temperature levels. The intake structure uses a three-stage telescoping gate that allows warmer surface water to overflow and mix with the 38 degree bottom water. Test results from the first months of operation show success in warming the downstream water to its natural temperature, and studies are underway to measure the effect on targeted trout.

Christenson, D.J. [Dept. of Interior, Washington, DC (United States); Sund, R.L. [Bureau of Reclamation, Denver, CO (United States); Marotz, B.L. [Montana Department of Fish, Kalispell, MT (United States)

1996-05-01

125

Navajo Safety of Dams Project: Photographic Documentation of Round Rock Dam, Apache County, Arizona.  

National Technical Information Service (NTIS)

Round Rock Dam, located on the Navajo Reservation, was evaluated and determined eligible for nomination to the National Register of Historic Places as part of a safety of dams project. The dam is an off-stream, rolled, homogeneous earthfill embankment typ...

W. G. White

1994-01-01

126

Out, out, dam spot! The geomorphic response of rivers to dam removal.  

Treesearch

Description: About 75,000 irrigation, flood control, and hydropower dams in the ... as both a challenge and opportunity for river management and research. ... Reservoirs created by small dams are often completely filled with sediment and no ... In contrast, reservoirs behind large dams typically still store water and are only ...

127

To Dam Or Not To Dam: An Insight Into The Environmental Politics Of Rivers  

Microsoft Academic Search

In today's highly charged climate of environmental politics, decisions about building dams are extremely hard to make. Simply put, those who have the authority to make such decisions are damned if they dam and are also damned if they don't! There is no easy answer to many of the questions related to dam construction. No matter what the advantages of

Ashraf Ghaly; Megan Ferry

128

4. UPSTREAM ELEVATION VIEW OF BIG TUJUNGA DAM SHOWING THE ...  

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

4. UPSTREAM ELEVATION VIEW OF BIG TUJUNGA DAM SHOWING THE CONTROL HOUSE AND THE SPILLWAY BRIDGE AT THE ENDS OF THE DAM FACING WEST. - Big Tujunga Dam, 809 West Big Tujunga Road, Sunland, Los Angeles County, CA

129

View of upstream face of Lake Sabrina Dam showing the ...  

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

View of upstream face of Lake Sabrina Dam showing the redwood planks and base of dam from Lake Sabrina Basin, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

130

3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELDSTONE DAM (KNOWN ...  

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

3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELD-STONE DAM (KNOWN LOCALLY AS DAM NO. 2), BUILT BY THE CCC - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

131

8. VIEW OF DAM 83, SHOWING OLD SOURIS RIVER CHANNEL ...  

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

8. VIEW OF DAM 83, SHOWING OLD SOURIS RIVER CHANNEL FROM THE DOWNSTREAM FACE OF THE DAM WITH POND A IN THE BACKGROUND, LOOKING SOUTH - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

132

4. VIEW, LOOKING SOUTHWEST, SHOWING A LARGE FIELDSTONE DAM (KNOWN ...  

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

4. VIEW, LOOKING SOUTHWEST, SHOWING A LARGE FIELD-STONE DAM (KNOWN LOCALLY AS DAM NO. 1), BUILT BY THE CCC - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

133

GENERAL VIEW OF THE WILSON DAM, LOOKING SOUTHEAST, GENERATING PLANT ...  

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

GENERAL VIEW OF THE WILSON DAM, LOOKING SOUTHEAST, GENERATING PLANT IN THE BACKGROUND. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

134

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

135

Geologic Setting of Mosul Dam and Its Engineering Implications.  

National Technical Information Service (NTIS)

The geologic setting of Mosul Dam is critically important for its engineering implications and its usefulness and contribution to engineering and operational decisions about the dam. The dam was constructed on alternating and highly variable units of gyps...

J. R. Kelley L. D. Wakeley S. W. Broadfoot M. L. Pearson C. A. McGrath

2007-01-01

136

77 FR 9265 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2012-02-16

137

77 FR 67813 - Sam Rayburn Dam Project Power Rate  

Federal Register 2010, 2011, 2012, 2013

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

2012-11-14

138

78 FR 7810 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2013-02-04

139

76 FR 24516 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2011-05-02

140

78 FR 21415 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2013-04-10

141

77 FR 22801 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2012-04-17

142

77 FR 43117 - Glen Canyon Dam Adaptive Management Work Group  

Federal Register 2010, 2011, 2012, 2013

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

2012-07-23

143

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

144

4. VIEW SHOWING UPSTREAM FACE OF DAM, LOOKING NORTHEAST ...  

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

4. VIEW SHOWING UPSTREAM FACE OF DAM, LOOKING NORTHEAST - High Mountain Dams in Upalco Unit, Kidney Lake Dam, Ashley National Forest, 4.7 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

145

5. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING ...  

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

5. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, Kidney Lake Dam, Ashley National Forest, 4.7 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

146

3. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, LOOKING EAST ...  

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

3. OVERALL VIEW OF DAM, SHOWING UPSTREAM FACE, LOOKING EAST - High Mountain Dams in Upalco Unit, Kidney Lake Dam, Ashley National Forest, 4.7 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

147

6. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING ...  

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

6. VIEW SHOWING DOWNSTREAM FACE AND TOE OF DAM, LOOKING SOUTHWEST - High Mountain Dams in Upalco Unit, Kidney Lake Dam, Ashley National Forest, 4.7 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

148

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

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

5. DETAIL VIEW OF DAM, SHOWING TAINTER GATES, GATE PIERS AND DAM BRIDGE, WITH ROLLER GATE HEADHOUSES IN BACKGROUND, LOOKING NORTHWEST, UPSTREAM - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 10, Guttenberg, Clayton County, IA

149

6. DETAIL VIEW OF DAM, SHOWING TAINTER GATES, GATE PIERS ...  

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

6. DETAIL VIEW OF DAM, SHOWING TAINTER GATES, GATE PIERS AND DAM BRIDGE, WITH ROLLER GATE HEADHOUSE IN BACKGROUND, LOOKING EAST, UPSTREAM - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 10, Guttenberg, Clayton County, IA

150

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

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

4. DETAIL VIEW OF DAM, SHOWING TAINTER AND ROLLER GATES, GATE PIERS AND DAM BRIDGE, LOOKING SOUTHWEST, DOWNSTREAM - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 10, Guttenberg, Clayton County, IA

151

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

Federal Register 2010, 2011, 2012, 2013

...TENNESSEE VALLEY AUTHORITY Permanent Dam Safety Modification at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams, TN AGENCY: Tennessee Valley Authority...permanent modifications to the existing dam facilities at Cherokee, Fort...

2011-06-14

152

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

153

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

154

Dynamic Reservoir Interaction with Monticello Dam,  

National Technical Information Service (NTIS)

The study of arch dam-reservoir interaction is an outgrowth of a 4-year U.S.-China cooperative research project on 'Interaction Effects in the Seismic Response of Arch Dams.' Inconsistent comparisons were obtained in that project between measured and calc...

R. W. Clough X. F. Qui Y. Ghanaat

1987-01-01

155

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

156

EARTH DAM OVERTOPPING AND BREACH OUTFLOW  

Technology Transfer Automated Retrieval System (TEKTRAN)

Over the past half-century, the USDA has assisted in the design and construction of approximately 11,000 flood control and multipurpose dams. As these dams approach the end of their planned service life, sediment pools fill and sediment deposition in the flood pool reduces flood storage. Simultane...

157

Sand dams: Africa's answer to climate change?  

Microsoft Academic Search

In semi-arid regions of Africa, sand dam technology can make a significant contribution to mitigating the impacts of climate change by providing a low-cost solution to the problem of water conservation. Despite clear benefits, sand dams are used relatively little as they are very labour intensive, meaning a lack of effective community engagement can endanger project implementation and sustainability. Excellent

Simon Maddrell; Sophie Bown

158

Weighing a dam's economic and environmental impact  

Microsoft Academic Search

While some people claim that it was a publicity stunt or criticize it as an economic loss and a move in the wrong direction, the breaching of the low-slung Edwards Dam on July 1 has changed the landscape of the Kennebec River flowing through Augusta, Maine, and may also change the landscape for some other dammed rivers nationwide.The breaching marks

Randy Showstack

1999-01-01

159

The protein content of dental rubber dams  

Microsoft Academic Search

Objectives: The purpose of this study was to analyse the protein content of 17 commonly used rubber dams and to determine if they contained known allergenic proteins.Methods: Proteins were eluted with buffer from 17 brands of commercially available rubber dams. The quantity of eluted protein was measured and expressed in micrograms in every gram of rubber. The molecular weights of

K. M. Martin; M. V. Martin; A. J. Birss; E. A. Field

1997-01-01

160

Historic American Engineering Record, Stewart Mountain Dam.  

National Technical Information Service (NTIS)

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

D. C. Jackson

1992-01-01

161

Historic American Engineering Record: Horseshoe Dam.  

National Technical Information Service (NTIS)

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

D. C. Jackson C. B. Fraser

1991-01-01

162

Earthquake-dammed lakes in New Zealand  

Microsoft Academic Search

Eleven small lakes were formed by landslides caused by the 1929 Buller earthquake; four others were formed by other historic earthquakes in New Zealand. At least nine other New Zealand lakes are also dammed by landslides and were probably formed by prehistoric earthquakes. When recognized by morphology, synchronous age, and areal distribution, earthquake-dammed lakes could provide an estimate of paleoseismicity

John Adams

1981-01-01

163

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

164

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

165

Influence of Dams on Downstream Beaches: Eressos, Lesbos, Eastern Mediterranean  

Microsoft Academic Search

Small water storage dams are nowadays regarded as the ideal solution for the water-thirsty islands of the Greek Archipelago. Several of these dams have been already constructed and more are planned for the near future. However, dams can also create problems to coastal areas, particularly to the beaches found at the lower reaches of the dammed rivers. The present contribution

A. F. Velegrakis; M. I. Vousdoukas; O. Andreadis; G. Adamakis; E. Pasakalidou; R. Meligonitis; G. Kokolatos

2008-01-01

166

Guidelines for Assessing Sediment-Related Effects of DAM Removal  

Microsoft Academic Search

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

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

2010-01-01

167

Intelligent early-warning system of dam safety  

Microsoft Academic Search

For the effective control of dam life process, it is important to implement the real-time diagnosis and reasonable evaluation for dam safety based on prototype observations. The development of intelligent early-warning systems of dam safety (IEWSDS) is a significant approach to realize above aim. This paper regarded dam as a vital and intelligent system, thereby constructed a bionics model of

Huai-Zhi Su; Zhi-Ping Wen

2005-01-01

168

Models of ‘appropriate’ practice in private dam safety assurance  

Microsoft Academic Search

Large dams are generally built and managed by Governments and private dams are built by individual owners. A number of horrific failures of both types have triggered serious concerns over the safety of dams in each country. For the larger dams, the response has been to spend vast amounts on structural upgrading works. Unfortunately, only a few countries have developed

John D Pisaniello; Jennifer M McKay

1998-01-01

169

Seismic upgrade of hydraulic fill dam by buttressing  

Microsoft Academic Search

The vulnerability of hydraulic fill dams under strong earthquake shaking has long been recognized. When located in areas of high seismic hazard, seismic upgrading of these types of dams is often required to meet current dam safety standards. Selection of an appropriate design concept for seismic upgrading of such dams requires careful consideration of seismically induced deformations when the hydraulic

L. H. Mejia; J. I. Sun; K. K. Leung

2005-01-01

170

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

171

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

172

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

173

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

174

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

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

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

175

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

176

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

177

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

178

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

179

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

180

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

181

Assessing Sediment-Related Effects of Dam Removals  

Microsoft Academic Search

Subcommittee on Sedimentation: Sediment Management and Dam Removal Workshop; Portland, Oregon, 14-16 October 2008; For a host of reasons including dam safety, maintenance costs, and ecological concerns, more dams are currently being removed each year in the United States than are being constructed. Because many reservoirs have accumulated sediments within their pools, dam removal can potentially impose a variety of

J. Rose Wallick; Timothy Randle

2009-01-01

182

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

183

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

184

Sustainability of dams-an evaluation approach  

NASA Astrophysics Data System (ADS)

Situated in the stream bed of a river, dams and reservoirs interrupt the natural hydrological cycle. They are very sensitive to all kinds of changes in the catchment, among others global impacts on land use, climate, settlement structures or living standards. Vice versa dams strongly affect the spatially distributed, complex system of ecology, economy and society in the catchment both up- and downstream of the reservoir. The occurrence of negative impacts due to large dams led to serious conflicts about future dams. Nevertheless, water shortages due to climatic conditions and their changes, that are faced by enormous water and energy demands due to rising living standards of a growing world population, seem to require further dam construction, even if both supply and demand management are optimised. Although environmental impact assessments are compulsory for dams financed by any of the international funding agencies, it has to be assumed that the projects lack sustainability. Starting from an inventory of today's environmental impact assessments as an integral part of a feasibility study the presentation will identify their inadequacies with regard to the sustainability of dams. To improve the sustainability of future dams and avoid the mistakes of the past, the planning procedures for dams have to be adapted. The highly complex and dynamical system of interrelated physical and non-physical processes, that involves many different groups of stakeholders, constitutes the need for a model-oriented decision support system. In line with the report of the World Commission of Dams an integrated analysis and structure of the complex interrelations between dams, ecology, economy and society will be presented. Thus the system, that a respective tool will be based on, is analysed. Furthermore an outlook will be given on the needs of the potential users of a DSS and how it has to be embedded in the overall planning process. The limits of computer-based decision-support in the very specific context of dam construction will be identified. Special focus will be on the constraints arising from the need to jointly evaluate qualitative and quantitative aspects and the methodological potential of multi-criteria evaluation in this respect.

Petersson, E.

2003-04-01

185

Alterations in morphometric and organosomatic indices and histopathological analyses indicative of environmental contamination in Mullet, Mugil liza, from Southeastern Brazil.  

PubMed

Mullet (Mugil liza) were sampled in five different areas along the Guanabara Bay, southeastern Brazil, classified as non-contaminated, moderately contaminated and contaminated. Morphometric (Fulton condition factor, relative condition factor and weight to length scaling coefficient) and organosomatic (hepatosomatic index) indices of environmental stress were analysed. Fish from the differentially contaminated areas show statistically different Fulton and relative condition factors and hepatosomatic indices, but not the weight to length scaling coefficient. The Kn and the FCF followed the same trend, with fish from São Gonçalo (1.07 ± 0.04 and 0.89 ± 0.03), Itaipu (0.84 ± 0.01 and 0.86 ± 0.01) and the Rodrigo de Freitas Lagoon (1.03 ± 0.01 and 0.87 ± 0.20) showing higher FCFs than fish from Magé (0.96 ± 0.01 and 0.81 ± 0.01). Fish from Itaipu showed significantly higher HSI values than the other sampling sites (1.68 ± 0.07), with fish from Olaria and Ipiranga showing the lowest (1.56 ± 0.12 and 1.60 ± 0.07, respectively). PMID:23052584

Hauser-Davis, R A; Lavandier, R C; Bastos, F F; Oliveira, T F; Ribeiro, C A Oliveira; Ziolli, R L; de Campos, R C

2012-10-02

186

Water-quality study of proposed reregulation dam downstream of Wolf Creek Dam, Cumberland River, Kentucky. Final report  

Microsoft Academic Search

This report describes the application of an unsteady, one-dimensional water-quality model to the Cumberland River below Wolf Creek Dam, Kentucky. A hydropower upgrade of Wolf Creek Dam and construction of a reregulation dam, located approximately 10 miles below Wolf Creek Dam, are under consideration. Simulations were conducted under unreregulated conditions and projected conditions following impoundment to provide information concerning the

1986-01-01

187

National Dam Safety Program. Buick Mine Tailings Dam (MO 30162), White River Basin, Reynolds County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Buick Mine Tailings Dam, Missouri Inventory Number 30162, was inspected. Buick Mine Tailings Dam is classified as a large dam based on its present height of 141 ft. The maximum storage capacity is approximately 19,300 ac-ft. The large dam classification c...

R. G. Berggreen L. M. Krazynski

1981-01-01

188

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

189

Vallecito Dam Flow Measurement and Weir Calibration.  

National Technical Information Service (NTIS)

Recent modifications to the Vallecito Dam outlet works structure have caused increased turbulence near the outlet works flow measurement device, making flow measurements unreliable. In addition, no accurate measure of flow through the spillway radial gate...

R. George

1994-01-01

190

Wynoochee Dam and Lake, Wynoochee River, Washington.  

National Technical Information Service (NTIS)

The Wynoochee Project in Grays Harbor County of southwestern Washington involves construction of a central concrete gravity dam 663 feet long and 175 feet high for the associated purposes of water supply, irrigation, flood control, recreation and fisherie...

1971-01-01

191

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

192

Historic American Engineering Record, Theodore Roosevelt Dam.  

National Technical Information Service (NTIS)

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

D. C. Jackson

1992-01-01

193

Design of Dams for Mill Tailings.  

National Technical Information Service (NTIS)

The report describes tailings disposal problems at mines throughout the United States in order to identify design principles that can be applied to all types of dams for mill tailings. The circular reviews computer programs for stability analysis and phre...

C. D. Kealy R. L. Soderberg

1969-01-01

194

Hydraulic Model Study of Brantley Dam Spillway.  

National Technical Information Service (NTIS)

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

E. R. Zeigler

1987-01-01

195

Walter Bouldin Dam Failure and Reconstruction.  

National Technical Information Service (NTIS)

Walter Bouldin is one of several hydroelectric developments of Alabama Power Company. On February 10, 1975, an earth embankment section of Walter Bouldin Dam was breached, causing total evacuation of the forebay reservoir and rendering the 225-MW power pl...

1978-01-01

196

Earthquake-dammed lakes in New Zealand  

SciTech Connect

Eleven small lakes were formed by landslides caused by the 1929 Buller earthquake; four others were formed by other historic earthquakes in New Zealand. At least nine other New Zealand lakes are also dammed by landslides and were probably formed by prehistoric earthquakes. When recognized by morphology, synchronous age, and areal distribution, earthquake-dammed lakes could provide an estimate of paleoseismicity for the past few hundred or thousand years.

Adams, J.

1981-05-01

197

DSM saves the dam. [Deep Soil Mix  

Microsoft Academic Search

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

1994-01-01

198

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

199

Distributional Impacts of Large Dams in China  

NASA Astrophysics Data System (ADS)

Dams on a river are believed to have heterogeneous impacts to the upstream, local and downstream areas. Generally, irrigation dams will bring benefits to the downstream by facilitating more irrigation, while it will bring negative impacts to upstream due to inundation or no impact to local area as a combination result of population dislocation and economic benefits. This paper checked the impacts of large dams (above 100 meters) on the upstream, downstream and local area, using 2000-2008 county level data in China. Robust heterogeneous impacts of different categories of dams (mainly dams serving for irrigation, hydropower, or other purposes) were found on different areas, using IV regression approaches. Dams higher than 100 meters are significantly and heterogeneously impacting agricultural production, urban employment and rural per capita income. Its beneficial impact on agriculture production is significant for downstream especially in continuous drought years. But its impacts on social welfare indicators, such as primary school enrollment and hospital beds, are not heterogeneously different across regions.

Bao, X.

2010-12-01

200

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

201

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

202

National Dam Safety Program. Research Needs Workshop: Embankment Dam Failure Analysis.  

National Technical Information Service (NTIS)

One of the activities authorized by the Dam Safety and Security Act of 2002 is research to enhance the Nation's ability to assure that adequate dam safety programs and practices are in place throughout the United States. The Act of 2002 states that the Di...

2008-01-01

203

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

204

Transition from EcoDam to T4Dam DNA recognition mechanism without loss of activity and specificity.  

PubMed

The EcoDam and T4Dam DNA-(adenine N6)-methyltransferases both methylate the adenine residue in GATC sites. These enzymes are highly related in amino acid sequence, but they deviate in their contact to the first base pair of the target sequence. EcoDam contacts Gua1 with K9 (which corresponds to T4Dam A6), while T4Dam contacts Gua1 with R130 (which corresponds to EcoDam Y138). We have "transplanted" the T4Dam DNA recognition into EcoDam and show that the EcoDam K9A/Y138R double mutant is highly active and specific. We also studied the intermediates of this transition: The EcoDam K9A variant showed low activity and loss of recognition of Gua1 [Horton, et al., J. Mol. Biol. 2006, 358, 559-570]. In contrast, the EcoDam Y138R variant, which carries both Gua1 recognition elements (K9 from EcoDam and R138 corresponding to R130 from T4Dam), is fully active and specific. This result indicates that a smooth evolutionary pathway exists for changing the EcoDam DNA recognition mode to T4Dam without loss of activity and without generation of evolutionary intermediates with reduced activity. We consistently observed increased activity of EcoDam variants containing Y138R; this suggests that the transition from EcoDam (Gua1 recognition through K9) to T4Dam (Gua1 recognition through R130) was driven by selective pressure towards increased catalytic activity. PMID:19725089

Elsawy, Hany; Podobinschi, Sveatoslav; Chahar, Sanjay; Jeltsch, Albert

2009-10-12

205

Toward policies and decision-making for dam removal.  

PubMed

Dam removal has emerged as a critical issue in environmental management. Agencies responsible for dams face a drastic increase in the number of potential dam removals in the near future. Given limited resources, these agencies need to develop ways to decide which dams should be removed and in what order. The underlying science of dam removal is relatively undeveloped and most agencies faced with dam removal lack a coherent purpose for removing dams. These shortcomings can be overcome by the implementation of two policies by agencies faced with dam removal: (1) the development and adoption of a prioritization scheme for what constitutes an important dam removal, and (2) the establishment of minimum levels of analysis prior to decision-making about a dam removal. Federal and state agencies and the scientific community must encourage an initial experimental phase of dam removal during which only a few dams are removed, and these are studied intensively. This will allow for the development of the fundamental scientific understanding needed to support effective decision-making in the future and minimize the risk of disasters arising from poorly thought out dam removal decisions. PMID:12677292

Doyle, Martin W; Harbor, Jon M; Stanley, Emily H

2003-04-01

206

Numerical modelling dam break analysis for water supply project  

NASA Astrophysics Data System (ADS)

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

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

2013-06-01

207

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

NASA Astrophysics Data System (ADS)

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

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

1990-07-01

208

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

209

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

210

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

211

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

212

5. VIEW SHOWING THE DOWNSTREAM SIDE OF SWAN FALLS DAM ...  

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

5. VIEW SHOWING THE DOWNSTREAM SIDE OF SWAN FALLS DAM AND POWER HOUSE, LOOKING UPSTREAM TO SOUTH FROM THE A MOUND OF DEBRIS ABOUT THIRTY TO FORTY FEET ABOVE THE RIVER - Swan Falls Dam, Snake River, Kuna, Ada County, ID

213

5. VIEW NORTHWEST ON SHELTON SIDE OF DAM. SHELTON GATEHOUSE ...  

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

5. VIEW NORTHWEST ON SHELTON SIDE OF DAM. SHELTON GATEHOUSE AND LOCK STRUCTURE. - Ousatonic Water Power Company, Dam & Canals, CT Routes 34 & 108, 1 mile North of Derby-Shelton Bridge, Derby, New Haven County, CT

214

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

215

23. VIEW OF HORSE MESA DAM, SHOWING SPILLWAY DISCHARGE TUNNEL ...  

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

23. VIEW OF HORSE MESA DAM, SHOWING SPILLWAY DISCHARGE TUNNEL AT LEFT, RIGHT (OR NORTH) SPILLWAY, HEFU POWER UNIT, AND ORIGINAL POWER PLANT - Horse Mesa Dam, Salt River, 65 miles East of Phoenix, Phoenix, Maricopa County, AZ

216

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

217

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

218

44. LOCK AND DAM NO. 26 (REPLACEMENT). LOCK LOCK ...  

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

44. LOCK AND DAM NO. 26 (REPLACEMENT). LOCK -- LOCK GUIDEWALLS -DOWNSTREAM GUIDEWALL, PARTIAL ISOMETRIC VIEW. M-L 26(R) 26/40 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26R, Alton, Madison County, IL

219

18. DAM, DETAIL PLAN OF SERVICE BRIDGE, GENERAL PLAN AND ...  

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

18. DAM, DETAIL PLAN OF SERVICE BRIDGE, GENERAL PLAN AND ELEVATION. September 1936 - Mississippi River 9-Foot Channel Project, Lock & Dam No. 17, Upper Mississippi River, New Boston, Mercer County, IL

220

Shaking Table Study to Investigate Failure Modes of Arch Dams.  

National Technical Information Service (NTIS)

Determining the stability of concrete dams using linear elastic finite element analyses can be very subjective when the results indicate nonlinear response. To reduce uncertainty associated with failure of concrete arch dams during an earthquake, large la...

T. Payne

2002-01-01

221

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

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

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

222

8. Early stage of power house construction at Dam No. ...  

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

8. Early stage of power house construction at Dam No. 4, showing two stiff leg derricks used to excavate limestone for power house building. Photo c. 1907. Credit PEM. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

223

19. Downstream face of Mormon Flat Dam completed. Power plant ...  

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

19. Downstream face of Mormon Flat Dam completed. Power plant is nearing completion. Photographer unknown, 1926. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

224

20. View of Mormon Flat Dam, power plant, and reservoir. ...  

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

20. View of Mormon Flat Dam, power plant, and reservoir. Photographer unknown, 1926. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

225

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

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

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

226

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

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

View of Lake Sabrina Dam showing the wooden planks along the upstream side face and the spillway at the right center of photo, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

227

View of upstream face of Lake Sabrina Dam showing redwood ...  

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

View of upstream face of Lake Sabrina Dam showing redwood planks and boulders in Lake Sabrina Basin, view north - Bishop Creek Hydroelectric System, Plant 2, Lake Sabrina Dam, Bishop Creek, Bishop, Inyo County, CA

228

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

229

"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

230

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

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

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

231

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

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

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

232

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

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

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

233

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

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

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

234

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

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

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

235

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

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

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

236

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

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

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

237

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

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

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

238

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

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

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

239

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

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

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

240

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

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

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

241

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

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

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

242

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

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

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

243

36. CROSS SECTIONAL VIEW OF ORIGINAL HORSE MESA DAM POWER ...  

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

36. CROSS SECTIONAL VIEW OF ORIGINAL HORSE MESA DAM POWER PLANT, LOOKING NORTH. ONLY TWO OF THE THREE UNITS ARE VISIBLE - Horse Mesa Dam, Salt River, 65 miles East of Phoenix, Phoenix, Maricopa County, AZ

244

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

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

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

245

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

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

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

246

1. VIEW SHOWING CONTRACTOR'S CAMP AND BARTLETT DAM IN THE ...  

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

1. VIEW SHOWING CONTRACTOR'S CAMP AND BARTLETT DAM IN THE DISTANCE. THE CONTRACTOR'S MESS HALL, COMMISSARY, RECREATIONAL HALL, DORMITORIES, CAMP HOSPITAL, AND WORKMEN'S COTTAGES ARE ALSO SHOWN. February 20, 1939 - Bartlett Dam, Verde River, Phoenix, Maricopa County, AZ

247

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

248

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

249

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

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

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

250

10. DETAIL VIEW OF SPILLWAY AT DAM 83, SHOWING RIVER ...  

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

10. DETAIL VIEW OF SPILLWAY AT DAM 83, SHOWING RIVER COBBLE PAVING (FOREGROUND) AND WINGWALL, LOOKING EAST - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

251

9. VIEW OF SPILLWAY AT DAM 83, SHOWING LOCATION OF ...  

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

9. VIEW OF SPILLWAY AT DAM 83, SHOWING LOCATION OF FORMER CONCRETE FLASHBOARD STRUCTURE ON RIGHT, LOOKING WEST - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

252

1. VIEW OF DAM 83, LOOKING SOUTHWEST FROM THE LOOKOUT ...  

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

1. VIEW OF DAM 83, LOOKING SOUTHWEST FROM THE LOOKOUT TOWER AT THE REFUGE HEADQUARTERS (see HAER No. ND-3-A-13 for comparison) - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

253

18. REMNANTS OF PORTION OF DAM THAT SERVED AS FEEDER ...  

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

18. REMNANTS OF PORTION OF DAM THAT SERVED AS FEEDER CANAL, WITH OUTER WALL OF LOCK AT RIGHT (April 1979) - Hamilton Street Dam, Lehigh River upstream of Hamilton Street Bridge, Allentown, Lehigh County, PA

254

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

255

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

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

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

256

15. SOUTH SIDE OF DAM SHOWING BAFFLE PIERS AT FOOT ...  

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

15. SOUTH SIDE OF DAM SHOWING BAFFLE PIERS AT FOOT OF SPILLWAY TO LEFT AND PARTIAL VIEW OF BUTTRESSES AND SIDEWALKS TO RIGHT. - Pit 4 Diversion Dam, Pit River west of State Highway 89, Big Bend, Shasta County, CA

257

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

258

A dam in the middle of a river  

NSDL National Science Digital Library

Dams have negative impacts on the plants and animals that have adapted to the specific movement of natural rivers and streams. Dams also cause temperature changes, erosion, and movement of sediment that are deadly to many organisms.

Katie Hale (California State University, Fullerton;Student, Biological Sciences)

2007-01-12

259

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

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

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

260

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

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

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

261

PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ARCH ...  

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

PALMDALE WATER COMPANY, LITTLE ROCK DAM: REINFORCEMENT, SECTION THROUGH ARCH RING, AMENDED SHEET 6; SEPTEMBER, 1922. Palmdale Water District files - Little Rock Creek Dam, Little Rock Creek, Littlerock, Los Angeles County, CA

262

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

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

97. DAM - TAINTER GATE OPERATING MACHINERY - TRAVELING HOIST - AMERICAN TYPE ASSEMBLY (ML-4-55/111-FS), February 1938 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI

263

100. DAM TAINTER GATE OPERATING MACHINERY AMERICAN HOIST ...  

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

100. DAM - TAINTER GATE OPERATING MACHINERY - AMERICAN HOIST CAR ELECTRIFICATION ASSEMBLY (ML-4-55/146), January 1958 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI

264

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

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

98. DAM - TAINTER GATE OPERATING MACHINERY - TRAVELING HOIST - AMERICAN TYPE ASSEMBLY (ML-4&5-55/112-FS), March 1934 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI

265

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

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

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

266

94. DAM TAINTER GATE OPERATING MACHINERY METHOD OF ...  

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

94. DAM - TAINTER GATE OPERATING MACHINERY - METHOD OF ATTACHING LIFTING CHAINS TO DRUMS OF HOIST - LAKESIDE TYPE (ML-4&5-55/34-FS), February 1938 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI

267

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

268

11. AVALON DAM GATE KEEPER'S COMPLEX: PUMPHOUSE AND LIFT ...  

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

11. AVALON DAM - GATE KEEPER'S COMPLEX: PUMPHOUSE AND LIFT FOR HOUSE WATER SUPPLY. VIEW TO EAST - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

269

15. DETAIL FROM NORTH END OF DAM, SHOWING TOP OF ...  

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

15. DETAIL FROM NORTH END OF DAM, SHOWING TOP OF NORTHERNMOST BUTTRESS, END OF CONCRETE WALK ATOP NORTH EMBANKMENT, AND THE ROCK CREEK RESERVOIR BEYOND. - Rock Creek Dam, East end of Rock Creek Road, Auburn, Placer County, CA

270

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

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

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

271

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

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

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

272

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

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

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

273

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

NASA Astrophysics Data System (ADS)

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

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

2012-10-01

274

Spatio-temporal evolution of induced seismicity at Acu reservoir, NE Brazil  

Microsoft Academic Search

SUMMARY We present the spatio-temporal evolution of seismicity recorded by eight three-component digital seismographs in operation continuously during a 3 yr period (1994 August to 1997 May) at Acu reservoir, NE Brazil. The Acu dam is a 34 m high earth-filled dam constructed in 1983 May on an area of Precambrian shield. Based on seismic monitoring between 1987 and 1989

A. F. do Nascimento; P. A. Cowie; R. J. Lunn; R. G. Pearce

2004-01-01

275

Asymptotic formulae for correcting finite element predicted natural frequencies of gravity and embankment dams  

Microsoft Academic Search

Extraction of natural frequencies of a gravity dam or an embankment dam plays an important role in the seismic design of the dam because the seismic response of a dam is dependent largely on the dynamic characteristics of the dam. Owing to the lack of exact solutions and the geometry of a dam, numerical methods such as finite element methods

Chongbin Zhao; G. P. Steven

1996-01-01

276

The Conceptual Basis for Ecological Responses to Dam Removal  

Microsoft Academic Search

the removal of nonfunctioning dams or dams that cause environmental harm or present unsafe conditions (Poff et al. 1997, Hart and Poff 2002). The basis for assessment of the eco-logical responses to dam removal and for the design of eco-logically effective removal practices is largely conceptual. Par-ticularly in the Pacific Northwest, the adverse effects that large dams have on endangered

STAN GREGORY; HIRAM LI; JUDY LI

2002-01-01

277

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

278

"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

279

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

280

Jackson Mills and Mine Falls Dams, Nashua, New Hampshire. Reconnaissance Report, Hydroelectric Feasibility. Volume 1, Jackson Mills Dam.  

National Technical Information Service (NTIS)

This study investigated hydroelectric development at Jackson Mills Dam in Nashua New Hampshire. Reinstallation of hydroelectric power at Jackson Mills Dam has been determined feasible. During the 1950's the region switched from hydroelectric power to oil,...

1979-01-01

281

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

Code of Federal Regulations, 2013 CFR

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

2013-07-01

282

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

2010-07-01

283

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...1102 Marine Events on the Colorado River, between Davis Dam (Bullhead... Where: that portion of the Colorado River starting from the entrance...

2009-07-01

284

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

2009-07-01

285

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...1102 Marine Events on the Colorado River, between Davis Dam (Bullhead... Where: that portion of the Colorado River starting from the entrance...

2010-07-01

286

Early Progress to Implement the Federal Guidelines for Dam Safety and Recommendations to Improve Federal Dam Safety Programs.  

National Technical Information Service (NTIS)

President Carter directed each of the Federal agencies responsible for dam safety to implement the new Federal Guidelines for Dam Safety on October 4, 1979. He also directed the major agency heads to report their progress toward implementing the Guideline...

B. A. Tschantz

1980-01-01

287

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

288

6. SOUTHERLYVIEW OF BIG TUJUNGA DAM SHOWING THE PARAPET WALL ...  

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

6. SOUTHERLYVIEW OF BIG TUJUNGA DAM SHOWING THE PARAPET WALL ALONG THE CREST, THE ELEVATOR SHAFT, AND THE CONTROL HOUSE AT THE END OF THE DAM. PHOTO TAKEN AT THE SOUTH OF THE SPILLWAY BRIDGE. - Big Tujunga Dam, 809 West Big Tujunga Road, Sunland, Los Angeles County, CA

289

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

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

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

290

30. Otter Lake Dam. View shows rustic stone facade of ...  

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

30. Otter Lake Dam. View shows rustic stone facade of the dam. The stepped face of the dam gives the illusion of a natural cascade. Facing southeast. - Blue Ridge Parkway, Between Shenandoah National Park & Great Smoky Mountains, Asheville, Buncombe County, NC

291

Endodontics: Part 6 Rubber dam and access cavities  

Microsoft Academic Search

Rubber dam is easy to apply once the basic components and principles are understood. An efficient and well-trained dental nurse will greatly facilitate the application procedure. Although preparation of the access cavity may be commenced before rubber dam is applied to enable anatomical landmarks to be followed, the rubber dam should be placed as soon as possible with adequate protection

P Carrotte

2004-01-01

292

50. AVALON DAM Photographic copy of historic photo, c1889 ...  

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

50. AVALON DAM - Photographic copy of historic photo, c1889 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'ROCK CUT AND DAM AT HEAD OF DITCH ABOVE EDDY, N.M.' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

293

52. AVALON DAM Photographic copy of historic photo, c1890 ...  

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

52. AVALON DAM - Photographic copy of historic photo, c1890 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF SCOURWAY THROUGH AVALON DAM DISCHARGING WATER - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

294

51. AVALON DAM Photographic copy of historic photo, c1889 ...  

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

51. AVALON DAM - Photographic copy of historic photo, c1889 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF EXCAVATION OF HEADGATE CHANNEL. ALSO SHOWS A PORTION OF DAM - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

295

61. AVALON DAM Photographic copy of historic photo, 1907 ...  

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

61. AVALON DAM - Photographic copy of historic photo, 1907 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF AVALON DAM RECONSTRUCTION - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

296

56. AVALON DAM Photographic copy of historic photo, December ...  

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

56. AVALON DAM - Photographic copy of historic photo, December 18, 1905 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'REMAINING PORTIONS OF WASHED OUT TEMPORARY DAM' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

297

Debris dams and the relief of headwater streams  

Microsoft Academic Search

In forested, mountain landscapes where debris flows are common, their deposition commonly forms valley-spanning dams of wood, boulders, or complex mixtures of both in headwater valleys. Sediment impoundment behind these dams causes alluviation in what would otherwise be bedrock channels. In this paper, the effects of debris dams on the evolution of headwater valley profiles over geologic time are examined.

Stephen T. Lancaster; Gordon E. Grant

2006-01-01

298

6. VIEW OF DAM 83, SHOWING OUTLET CHANNEL FLOWING INTO ...  

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

6. VIEW OF DAM 83, SHOWING OUTLET CHANNEL FLOWING INTO POND A WITH DIVERSION GATES LONG EAST (LEFT) SIDE OF OUTLET CHANNEL, LOOKING SOUTH FROM DOWNSTREAM FACE OF THE DAM - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

299

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

300

Making an automated monitoring system work at Tolt Dam  

Microsoft Academic Search

A major upgrade of the dam safety program at Tolt Dam in Seattle, Washington is described. The upgrade was prompted by the age (30 years) of the dam, the addition of a hydroelectric plant, and public concern. The program is based on an automated condition monitoring and advance warning system. The design, implementation, and operating experience of the system are

J. M. Marilley; B. K. Myers

1996-01-01

301

Simple empirical model of aeration at navigation dams.  

National Technical Information Service (NTIS)

In a study of aeration at 28 dams in the upper Ohio River basin, a least-squares linear regression model was developed to predict the dissolved oxygen deficit below the dam as a linear function of the deficit above the dam. A linear statistical model was ...

S. F. Railsback

1990-01-01

302

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

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

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

303

77 FR 50493 - Sam Rayburn Dam Project Power Rate  

Federal Register 2010, 2011, 2012, 2013

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

2012-08-21

304

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2012 CFR

...2011-10-01 true 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...

2012-10-01

305

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

306

Three gorges : the biggest dam in the world  

NSDL National Science Digital Library

Students will understand the following:The enormous Three Gorges Dam is now being constructed in China on the upper Yangtze River.The dam will benefit many people, but it may also cause serious problems.Dams are built according to complex principles of engineering.

Leaf, Jeffrey

2006-01-01

307

43 CFR 418.18 - Diversions at Derby Dam.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 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...

2011-10-01

308

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

309

75. AVALON DAM Photographic copy of historic photo, April ...  

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

75. AVALON DAM - Photographic copy of historic photo, April 10, 1938 (original print in '1938 Annual Report of the Carlsbad Project,' located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'AVALON DAM - CCC ROCK WORK AT SPILLWAY NO. 2' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

310

Experiments of Debris Flow Damming in Southeast Tibet  

Microsoft Academic Search

In this paper, the formations of jammed dam by debris flow's injection and the influences on mainstream's riverbed by subsequent outburst of the dam are discussed based on a model test. The experiments lasted 3 months, together with 13 groups of tests in all. As the junctional angle is equal to 90, the critical index of jammed dam was established

Zunlan CHENG; Chao Dang; Jingjing LIU; Yiwen GONG

2007-01-01

311

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

312

1. AERIAL VIEW OF LOCK AND DAM, LOOKING EAST Photocopy ...  

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

1. AERIAL VIEW OF LOCK AND DAM, LOOKING EAST Photocopy of photograph, ca. 1980, courtesy of the U.S. Engineer Office, St. Louis, Missouri. Original print on file at Mississippi River Lock and Dam No. 24, Clarksville, Missouri - Upper Mississippi River Nine-Foot Channel Project, Lock & Dam No. 24, Clarksville, Pike County, MO

313

Geomorphology and American dams: The scientific, social, and economic context  

Microsoft Academic Search

American geomorphologic research related to dams is embedded in a complicated context of science, policy, economics, and culture. Research into the downstream effects of large dams has progressed to the point of theory-building, but generalization and theory-building are from this research because (1) it is highly focused on a few locations, (2) it concerns mostly very large dams rather than

William L. Graf

2005-01-01

314

Mortalities of Downstream Migrant Salmon at McNary Dam  

Microsoft Academic Search

A 3-year study was conducted to determine mortality rates for downstream migrant salmonids passing through spillways or turbines at McNary Dam. Mortalities were determined by releasing marked fish into the exit under study (spillway or turbine) and marked control groups immediately below the dam. Samples of released fish were recovered at stations below the dam, and survival rates were computed

Dale E. Schoeneman; Richard T. Pressey; Charles O. Junge Jr

1961-01-01

315

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

316

Nonlinear seismic response analysis of arch dam-foundation systems- part I dam-foundation rock interaction  

Microsoft Academic Search

The arch dam–foundation rock dynamic interaction and the nonlinear opening and closing effects of contact joints on arch dam\\u000a are important to the seismic response analysis of arch dams. Up to date, there is not yet a reasonable and rigorous procedure\\u000a including the two factors in seismic response analysis. The methods for the analysis of arch dam–foundation rock dynamic interaction

Xiuli Du; Yanhong Zhang; Boyan Zhang

2007-01-01

317

National Program for Inspection of Non-Federal Dams. Williams Lake Dam (MA 00451), Merrimack River Basin, Marlborough, Massachusetts. Phase 1 Inspection Report.  

National Technical Information Service (NTIS)

Williams Lake Dam is an earth embankment dam with a downstream rubble masonry wall. The dam is about 183 ft. long and 6 ft. high. The dam is small in size and has a hazard potential of high. Failure of the dam would flood Interstate Route I-495 and a hous...

1980-01-01

318

Design of Tailings Dams and Impoundments  

Microsoft Academic Search

The state of practice for tailings dam and impoundment design is summarized. The design process, which embraces construction, operational and closure issues together with requisite technical aspects, has evolved over the past several decades though the engineering principles have remained the same. The design process has evolved to meet the demands of a regulatory environment that has become increasingly stringent

Michael P. Davies; Peter C. Lighthall; Steve Rice; Todd E. Martin

319

Dams and Salmon: A Northwest Choice  

ERIC Educational Resources Information Center

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

Tucker, Michael; Tromley, Cheryl L.

2005-01-01

320

Practical considerations in modeling earth dam overtopping  

Technology Transfer Automated Retrieval System (TEKTRAN)

Significant numbers of watershed flood control dams in the United States are approaching the end of their planned service life. As the sediment pools fill and sediment encroaches on the flood storage, the potential for overtopping is increased. Changes in the watershed upstream may also increase o...

321

DAM SAFETY RISK ASSESSMENT WITH UNCERTAINTY ANALYSIS  

Microsoft Academic Search

The use of uncertainty analysis in conjunction with risk assessment provides enhanced information for decision makers. Uncertainties in risk analysis inputs are propagated through the risk analysis and evaluation steps of risk assessment to obtain estimates of the level of confidence in the risk assessment outcomes. This paper presents a framework for uncertainty analysis in dam safety risk assessment, including

Sanjay S. Chauhan; David S. Bowles

2003-01-01

322

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

323

Developments in Concrete Dam Construction in Turkey.  

National Technical Information Service (NTIS)

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

U. Oezis M. Alsan

1990-01-01

324

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

325

Dams and Salmon: A Northwest Choice  

ERIC Educational Resources Information Center

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

Tucker, Michael; Tromley, Cheryl L.

2005-01-01

326

Geologic Conceptual Model of Mosul Dam.  

National Technical Information Service (NTIS)

Mosul Dam, Iraq, was built in the 1980s on a foundation of soluble geologic materials. Because of the solubility of its foundation and abutments, maintenance grouting began immediately after construction and continues to the present. The U.S. Army is conc...

L. D. Wakeley J. R. Kelley C. A. Talbot M. L. Pearson S. W. Broadfoot

2007-01-01

327

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

328

Wynoochee Dam and Lake, Wynoochee River, Washington.  

National Technical Information Service (NTIS)

The Wynoochee Project in Grays Harbor County of southwestern Washington involves construction of a multipurpose concrete gravity dam 663 feet long and 175 feet high. Adverse environmental effects include loss of 5.4 miles of resident stream fish habitat a...

1972-01-01

329

Experimental research on the dam-break mechanisms of the Jiadanwan landslide dam triggered by the Wenchuan earthquake in China.  

PubMed

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; Zhou, Jia-wen; Hao, Ming-hui

2013-06-04

330

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

PubMed Central

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

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

2013-01-01

331

Reclamation: Managing Water in the West. Record of Decision Folsom Dam Safety of Dams and Security Upgrades Projects.  

National Technical Information Service (NTIS)

This document is the Record of Decision (ROD) of the United States Department of the Interior, Bureau of Reclamation (Reclamation), Mid-Pacific Region, for the Safety of Dams and Dam Security aspects of the Folsom Dam Safety and Flood Damage Reduction (DS...

2007-01-01

332

76 FR 25310 - Intent To Prepare an Environmental Impact Statement for the Zoar Levee and Diversion Dam, Dam...  

Federal Register 2010, 2011, 2012, 2013

...upstream of the dam, which corresponds to the height of the spillway of the dam. c. The Zoar Levee was constructed in 1937 with...which provided three feet of freeboard over the Dover Dam spillway crest of elevation 916' above msl. The crest elevation...

2011-05-04

333

Dam break threshold value and risk probability assessment for an earth dam  

Microsoft Academic Search

In dam safety assessment, it is customary to focus on stability analysis, and the safety factor is regarded as an assessment\\u000a index that cannot correctly reflect the effect of multi-factors and variable uncertainty. The factors that induce dam breaks\\u000a are complex and uncertain; however, three primary ones can be identified: hydrological factors, seepage and bank slope instability.\\u000a In this paper,

Denghua Zhong; Yuefeng Sun; Mingchao Li

334

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

335

A simple empirical model of aeration at navigation dams  

SciTech Connect

In a study of aeration at 28 dams in the upper Ohio River basin, a least-squares linear regression model was developed to predict the dissolved oxygen deficit below the dam as a linear function of the deficit above the dam. A linear statistical model was chosen because theory-based models are not readily applicable to navigation dams and because previous empirical models do not simulate the supersaturation that field data showed. The statistical model simulates supersaturation, is an adequate predictor of aeration at almost all of the dams, and allows easy analysis of uncertainties. 8 refs., 6 figs.

Railsback, S.F.

1990-01-01

336

The use of rubber dam among Czech dental practitioners.  

PubMed

Rubber dam is considered an ideal device for tooth isolation. Nevertheless, its usage is quite rare in the Czech Republic. The aim of this study was: firstly, to gather and evaluate information regarding the use of rubber dam by dentists in the Czech Republic and to compare it with other countries; secondly to find out whether there are any influencing factors as to rubber dam usage; and finally to find out frequency of rubber dam use separately in endodontic treatment and in placing fillings of different materials. A questionnaire-based survey was conducted. Dentists filled in the questionnaires during dental conventions, educational events, conferences and congresses. Rubber dam was routinely used by less than eight per cent of the respondents (n = 35); less than twenty-two per cent of the respondents (n = 97) used rubber dam occasionally, and more than seventy per cent of the respondents (n = 317) has never use it. The results showed that rubber dam is not used frequently in the Czech Republic. If rubber dam is used, then it is typically for endodontic treatment or composite fillings. There were several factors with a statistically significant influence on the usage of rubber dam, such as gender, length of professional career, percentage of direct payments, previous experience in using rubber dam, and undergraduate training in rubber dam use. PMID:22283107

Kapitán, Martin; Sustová, Zdenka

2011-01-01

337

Dynamic decision making for dam-break emergency management - Part 2: Application to Tangjiashan landslide dam failure  

NASA Astrophysics Data System (ADS)

Tangjiashan landslide dam, which was triggered by the Ms = 8.0 Wenchuan earthquake in 2008 in China, threatened 1.2 million people downstream of the dam. All people in Beichuan Town 3.5 km downstream of the dam and 197 thousand people in Mianyang City 85 km downstream of the dam were evacuated 10 days before the breaching of the dam. Making such an important decision under uncertainty was difficult. This paper applied a dynamic decision-making framework for dam-break emergency management (DYDEM) to help rational decision in the emergency management of the Tangjiashan landslide dam. Three stages are identified with different levels of hydrological, geological and social-economic information along the timeline of the landslide dam failure event. The probability of dam failure is taken as a time series. The dam breaching parameters are predicted with a set of empirical models in stage 1 when no soil property information is known, and a physical model in stages 2 and 3 when knowledge of soil properties has been obtained. The flood routing downstream of the dam in these three stages is analyzed to evaluate the population at risk (PAR). The flood consequences, including evacuation costs, flood damage and monetized loss of life, are evaluated as functions of warning time using a human risk analysis model based on Bayesian networks. Finally, dynamic decision analysis is conducted to find the optimal time to evacuate the population at risk with minimum total loss in each of these three stages.

Peng, M.; Zhang, L. M.

2013-02-01

338

Radial gate evaluation: Olympus Dam, Colorado  

SciTech Connect

The report presents a structural analysis of the radial gates of Olympus Dam in eastern Colorado. Five 20-foot wide by 17-foot high radial gates are used to control flow through the spillway at Olympus Dam. The spillway gates were designed in 1947. The gate arm assemblies consist of two separate wide flange beams, with a single brace between the arms. The arms pivot about a 4.0-inch diameter pin and bronze graphite-insert bushing. The pin is cantilevered from the pier anchor girder. The radial gates are supported by a pin bearing on a pier anchor birder bolted to the end of the concrete pier. The gates are operated by two-part wire rope 15,000-pound capacity hoise. Stoplog slots upstream of the radial gates are provided in the concrete piers. Selected drawings of the gates and hoists are located in appendix A.

NONE

1997-06-01

339

Dam-Break Waves on Movable Bed  

Microsoft Academic Search

Experimental data on the propagation of dam-break waves over movable bed are presented and discussed. Tests were performed in a 19.2 m long, 0.5 m wide and 0.7 m high, horizontal flume. Water levels were measured at seven stations by using pressure transducers; bed levels and upstream water surfaces levels were monitored through five digital video cameras; at the end

J. G. A. B. Leal; R. M. L. Ferreira; A. H. Cardoso

340

Tensile and tear properties of dental dam.  

PubMed

The tensile and tear properties of highly extensible latex are sensitive to specimen shape. Three specimen shapes (ASTM D412 Die C dumbbell tensile specimen, rectangular tensile specimen with 1.74 mm hole, and ASTM D624 Die C tear specimen) were evaluated for proposed ANSI/ADA specification #90 for dental dams. Fresh and aged dental dams from two manufacturers (Aseptico and Hygenic) in three weights (thin, medium, and heavy) and from two other manufacturers (Ivory and Ivoclar) in one weight (medium) were tested. Means and standard deviations of 10 specimens for tensile strength (MPa), elongation (%), and tear strength (kN/m) are included herein. Data were analyzed by analysis of variance. Means were compared by a Tukey-Kramer interval calculated at the 0.05 significance level. The use of the dumbbell and tear specimens for the evaluation of dental dam should be reconsidered. The rectangular specimen with a hole is recommended for use in the proposed specification because of its sensitivity to condition (fresh versus aged) and manufacturer. PMID:8632138

Svec, T A; Powers, J M; Ladd, G D; Meyer, T N

1996-05-01

341

Reproductive aspects of piranhas Serrasalmus spilopleura and Serrasalmus marginatus into the upper Paraná River, Brazil.  

PubMed

Construction of the Itaipu Dam, 150 km downstream from Sete Quedas Falls, resulted in the drowning of that natural geographic barrier, with consequent invasion of Serrasalmus marginatus in the upper stream. This event was followed by the reduction in the abundance of the native species, S. spilopleura. Analyzes of reproductive activity these species revealed that in lotic waters S. marginatus had a very intense reproductive activity while activity of S. spilopleura was nil. This, probably made it possible for the invading species to occupy new environments into the Upper Paraná River, using the river as an entry port. In the 1987-1988 period there was a marked decline in reproductive activity of S. spilopleura reflecting the negative effects of its interaction with the invading species, S. marginatus. The assertiveness of S. marginatus in caring for its offspring and aggressiveness in establishing its feeding territory may be the determining factor for its competitive superiority over S. spilopleura, and consequently its success in colonizing the Upper Paraná River. In addition to the negative interference of S. marginatus, a possible recruitment failure of S. spilopleura could have benefited the colonization of the floodplain by the invader species. PMID:12914409

Agostinho, C S

2003-08-14

342

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

343

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

344

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

345

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

346

National Program for Inspection of Non-Federal Dams. Bickford Pond Dam (MA 01021), Bickford Reservoir Dam (MA 01022), Connecticut River Basin, Hubbardston and Princeton, Massachusetts. Phase 1 Inspection Report.  

National Technical Information Service (NTIS)

Bickford Pond Dam which was built in 1970 is a 933-foot long earth dam with concrete core wall. The dam has a maximum height of 51.2 feet and includes a drop inlet spillway and box conduit outlet structure. Bickford Reservoir Dam, also known as the Bickfo...

1980-01-01

347

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

348

Locks and Dam 1 (Ford Dam), Mississippi River, draft feasibility report and environmental assessment for hydropower  

SciTech Connect

This report presents a detailed evaluation of additional hydropower potential at Locks and Dam 1. An earlier evaluation in a reconnaissance level report (September 1981) indicated preliminary feasibility for added hydropower at this Federal navigation project site. The original Federal navigation locks and dam project included a foundation for a hydropower plant to be developed by non-Federal interests. The existing hydropower plant and equipment are owned and operated by the Ford Motor Company. The existing four turbines generate a combined nameplate capacity of 14.4 MW (megawatts).

Not Available

1984-08-01

349

Evaluation and Use of Risk Estimates in Dam Safety Decisionmaking  

Microsoft Academic Search

Risk evaluation criteria can serve a useful role in developing a business case for justifying dam safety risk-reduction measures for individual dams and for portfolios of dams. This paper discusses the limitations of simple threshold criteria and the use of estimates of the cost-effectiveness of risk-reduction measures to evaluate ALARP (as low as reasonably practicable) considerations, which play a role

David S. Bowles

2001-01-01

350

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

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

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

351

Shape optimal design of arch dams including dam-water–foundation rock interaction using a grading strategy and approximation concepts  

Microsoft Academic Search

Optimal design of arch dams including dam-water–foundation rock interaction is achieved using the soft computing techniques. For this, linear dynamic behavior of arch dam-water–foundation rock system subjected to earthquake ground motion is simulated using the finite element method at first and then, to reduce the computational cost of optimization process, a wavelet back propagation neural network (WBPNN) is designed to

S. M. Seyedpoor; J. Salajegheh; E. Salajegheh

2010-01-01

352

National Program for Inspection of Non-Federal Dams. Little Nugget Lake Dam (MA 00103), French River Basin, Charlton, Massachusetts. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Little Nugget Lake Dam is a dry-stone masonry and earth dam with a broad crested weir spillway. The existing dam was constructed prior to 1924 with major repairs performed in 1940 and 1967-1968. The dam has a maximum height of 13 feet and is approximately...

1978-01-01

353

National Dam Safety Program. Pea Ridge Mine Dam (MO 30473), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Pea Ridge Mine Dam is an active tailings dam. Unlike most tailings dams in the area which were constructed for barite ore processing operations, this dam was constructed for an iron mining operation. Cobber reject is the primary material used to construct...

J. Y. Perez S. F. Gizienski

1980-01-01

354

National Program for Inspection of Non-Federal Dams. Murray Printing Company Dam (MA 00130), Merrimack River Basin, Westford, Massachusetts. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam consists of a stone masonry main spillway with flashboards and an adjacent canal inlet structure. The 76 ft. long dam has a main spillway about 40 ft. in length. The maximum height of the dam is estimated to be 9.3 ft. The dam is confirmed to have...

1979-01-01

355

National Program for Inspection of Non-Federal Dams. Peter Pond Dam (MA 00112), French River Basin, Dudley, Massachusetts. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The dam at Peter Pond is an earthfill dam with a downstream masonry wall. The dam has a maximum height of 10 feet and is approximately 255 feet long. It is classified in the 'significant' hazard category. The dam is considered to be in good to fair condit...

1978-01-01

356

Deer Creek Dam, Hydroelectric Powerplant, 868 feet/291 degrees from intersection ...  

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

Deer Creek Dam, Hydroelectric Powerplant, 868 feet/291 degrees from intersection of dam complex access road with U.S. Highway 189, 1,340 feet/352 degrees from the dam spillway overpass, Charleston, Wasatch County, UT

357

43 CFR 431.7 - Administration and management of the Colorado River Dam Fund.  

Code of Federal Regulations, 2010 CFR

...Administration and management of the Colorado River Dam Fund. 431.7 Section...Administration and management of the Colorado River Dam Fund. Reclamation is responsible...and the administration of the Colorado River Dam Fund and the Lower...

2009-10-01

358

43 CFR 431.7 - Administration and management of the Colorado River Dam Fund.  

Code of Federal Regulations, 2010 CFR

...Administration and management of the Colorado River Dam Fund. 431.7 Section...Administration and management of the Colorado River Dam Fund. Reclamation is responsible...and the administration of the Colorado River Dam Fund and the Lower...

2010-10-01

359

75 FR 20381 - Glen Canyon Dam Adaptive Management Work Group (AMWG)  

Federal Register 2010, 2011, 2012, 2013

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

2010-04-19

360

76 FR 20654 - Grand River Dam Authority; Notice of Application Accepted for Filing and Soliciting Comments...  

Federal Register 2010, 2011, 2012, 2013

...Project No. 1494-390] Grand River Dam Authority; Notice of Application Accepted...29, 2010. d. Applicant: Grand River Dam Authority. e. Name of Project: Pensacola...easement will be located on Grand River Dam Authority property in Section 2,...

2011-04-13

361

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

Federal Register 2010, 2011, 2012, 2013

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

2013-06-13

362

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

363

76 FR 584 - Glen Canyon Dam Adaptive Management Program Work Group (AMWG)  

Federal Register 2010, 2011, 2012, 2013

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

2011-01-05

364

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

Federal Register 2010, 2011, 2012, 2013

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

2010-01-05

365

75 FR 44809 - Glen Canyon Dam Adaptive Management Work Group (AMWG)  

Federal Register 2010, 2011, 2012, 2013

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

2010-07-29

366

Gene expression of DAM5 and DAM6 is suppressed by chilling temperatures and inversely correlated with bud break rate  

Microsoft Academic Search

We previously identified a cluster of d\\u000a ormancy-a\\u000a ssociated\\u000a M\\u000a ADS-box transcription factors (DAM genes) in peach [Prunus persica (L.) Batsch] as potential candidates for control of the non-dormant phenotype observed in the evg mutant. Of these genes, DAM3, DAM5 and DAM6 were winter expressed, suggesting a role for these genes during endodormancy. We used peach cultivars with contrasting chilling

S. Jiménez; G. L. Reighard; D. G. Bielenberg

2010-01-01

367

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

NASA Astrophysics Data System (ADS)

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 scheduled removal allowing a portion of the impounded sediment to move down through the river system. This event changed the removal plans and the remainder of the spillway was removed under an emergency order in the course of 4 days. The Union City Dam, a 2.44-m-high timber crib/rock fill dam capped with concrete and stone, was removed on schedule. A portion of the impounded sediment was removed by mechanical means during the deconstruction of the structure. The evolution of the two upstream channels post-project provided unique challenges and valuable insights as to what kind of channel transition can be expected in gravel bed river systems after a low head dam has been removed. This paper describes the initial engineering analysis and design, the subsequent removal of the two dams, and compares observations on the transition of the upstream channels following dam removal to the initial engineering predictions and other models. The relatively steep gravel bed channels evolved in a predictable manner, except where anthropogenic barriers (sanitary sewer, rock weir) interrupted.

Wildman, Laura A. S.; Macbroom, James G.

2005-10-01

368

Use of GIS for Earthquakes in Brazil  

NASA Astrophysics Data System (ADS)

We present geoprocessing techniques to monitor and analyse earthquakes in Brazil. We constructed a georeferenced database called SIGSIBRA using PostgreSQL + PostGIS softwares, and fed by information from the SISBRA earthquake catalog, IBGE geographical data and CPRM geological data. The SISBRA catalog was built from the book "Sismicidade Brasileira" (Berrocal et al, 1984), updated with the Brazilian seismic bulletins from the Brazilian Geophysical Journal up to 1995, and especially with the data from seismographic monitoring activities of the University of Brasília-SIS/UnB, the Federal University of Rio Grande do Norte-UFRN, the University of Sao Paulo-USP and the Institute for Technological Research (IPT). Earthquakes occur in Brazil with moderate to low magnitudes. Besides natural earthquakes, seismic activity triggered by water dams must also be monitored. With the growing number and size of Brazilian dams (because of the many rivers, favorable topography and "clean" energy) concern with reservoir triggered seismicity is expected to increase. Approval for the construction of a hydropower plant requires seismic hazard assesmment prepared by an interdisciplinary team, with a large contribution of geoprocessing specialists. Therefore, it is important to study the characteristics of this seismicity, so that these professionals can avoid or mitigate potential environmental and social harm to communities on the margins of large dams. Thus the SIGSIBRA system can generate spatial analysis of its events, such as intensity estimation of "Kernel" points distribution; spatial statistics; spatial autocorrelation (Morans I) and correlations with geological structures, making it possible to characterize important aspects of the Brazilian seismicity. Finally, we show the statistical analysis of the database through the program ZMAP and estimate the intraplate seismogenic zones in Brazil.

Franca, G. S.; Algarte, K. T.; Assumpcao, M.; Barbosa, J. R.; Roig, H. L.; Pascual, M. F.; Vasconcelos, A. E.; Ferreira, J. M.; Ribotta, L. C.; do Nascimento, A. F.; Pavao, C. G.

2011-12-01

369

Survey of feline leukemia virus and feline coronaviruses in captive neotropical wild felids from Southern Brazil.  

PubMed

A total of 57 captive neotropical felids (one Leopardus geoffroyi, 14 Leopardus pardalis, 17 Leopardus wiedii, 22 Leopardus tigrinus, and three Puma yagouaroundi) from the Itaipu Binacional Wildlife Research Center (Refúgio Bela Vista, Southern Brazil) were anesthetized for blood collection. Feces samples were available for 44 animals, including one L. geoffroyi, eight L. pardalis, 14 L. wiedii, 20 L. tigrinus, and one P. yagouaroundi. Total DNA and RNA were extracted from blood and feces, respectively, using commercial kits. Blood DNA samples were evaluated by polymerase chain reaction (PCR) for feline leukemia virus (FeLV) proviral DNA, whereas reverse transcriptase-PCR was run on fecal samples for detection of coronavirus RNA. None of the samples were positive for coronaviruses. A male L. pardalis and a female L. tigrinus were positive for FeLV proviral DNA, and identities of PCR products were confirmed by sequencing. This is the first evidence of FeLV proviral DNA in these species in Southern Brazil. PMID:19569487

Guimaraes, Ana M S; Brandão, Paulo E; de Moraes, Wanderlei; Cubas, Zalmir S; Santos, Leonilda C; Villarreal, Laura Y B; Robes, Rogério R; Coelho, Fabiana M; Resende, Mauricio; Santos, Renata C F; Oliveira, Rosangela C; Yamaguti, Mauricio; Marques, Lucas M; Neto, Renata L; Buzinhani, Melissa; Marques, Regina; Messick, Joanne B; Biondo, Alexander W; Timenetsky, Jorge

2009-06-01

370

Dam that social networking: Connecting South Africa's major dams to social media  

Microsoft Academic Search

South Africa is a semi-arid country and water resources need to be monitored. The Internet of Things is the phenomenon of more and more things (as opposed to people and services) becoming connected to the Internet. This paper describes a project where four major South African dams are connected to Twitter and Facebook (and other social media such as MXit

Laurie Butgereit

2011-01-01

371

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

National Technical Information Service (NTIS)

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

1996-01-01

372

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

373

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

374

THE EFFECT OF INTERACTION BETWEEN RESERVOIR AND MULTI-LAYER FOUNDATION ON THE DYNAMIC RESPONSE OF A TYPICAL ARCH DAM (KARAJ DAM) TO \\  

Microsoft Academic Search

Analysis of the dynamic response of a three-dimensional arch dam is conducted taking into account the effects of dam-reservoir and dam-foundation interactions. The Karaj arch-dam in Iran is considered as a case study. The dam, fluid, and foundation domains are treated as substructures and modeled with boundary elements. The foundation domain is assumed to be layered and infinite. This study

Pedram Mosahebi Mohammadi; Asadollah Noorzad; Mohammad Rahimian; Babak Omidvar

375

Determination of heavy metals and metals levels in five fish species from I??kl? Dam Lake and Karacaören Dam Lake (Turkey)  

Microsoft Academic Search

The concentrations of heavy metals and metals (Zn, Pb, Bi, Cd, Ni, Co, Fe, Mn, Mg, Cu, Cr, Ca, Sr, Na, Li, K) were measured\\u000a in muscle of five species Cyprinus carpio (from I??kl? dam), Scardinius erythrophthalmus (from I??kl? dam), Tinca tinca (from I??kl? dam), C. carpio (from Karacaören dam), Carassius carassius (from Karacaören dam) caught from I??kl? and Karacaören.

Leyla Kalyoncu; Hasan Kalyoncu; Gül?in Arslan

376

Melanoides tuberculata as intermediate host of Philophthalmus gralli in Brazil.  

PubMed

Melanoides tuberculata that naturally harbored trematode larvae were collected at the Pampulha dam, Belo Horizonte (Minas Gerais, Brazil), during malacological surveys conducted from 2006 to 2010. From 7,164 specimens of M. tuberculata collected, 25 (0.35%) were infected by cercariae, which have been morphologically characterized as belonging to the Megalurous group, genus Philophthalmus. Excysted metacercariae were used for successful experimental infection of Gallus gallus domesticus, and adult parasites recovered from the nictitating membranes of chickens were identified as Philophthalmus gralli. This is the first report of P. gralli in M. tuberculata in Brazil. PMID:21225216

Pinto, Hudson Alves; Melo, Alan Lane de

377

18 CFR 11.3 - Use of government dams, excluding pumped storage projects.  

Code of Federal Regulations, 2013 CFR

...government dams, excluding pumped storage projects. 11.3 Section 11...Power and Water Resources FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT...government dams, excluding pumped storage projects. (a)...

2013-04-01

378

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

379

Institutionalizing the option of dam removal: the New Hampshire initiative.  

PubMed

For two years, the State of New Hampshire has worked to institutionalize the option of dam removal. The high gradient streams that flow through the granite hills and mountains of this small northeastern state provided ideal conditions for dam construction, particularly during America's Industrial Revolution of the 1800s when mills were constructed throughout the area. With more than 4,800 dams in the state's database, there are many opportunities for the removal of dams that no longer serve a useful purpose, have become a public safety hazard and impact the river environment. Efforts to facilitate removal of dams in New Hampshire include the formation of a River Restoration Task Force and the creation of a dam removal program within the state agency responsible for regulating dams. This has led to the removal of two dams in the past year, with approximately ten additional projects in various stages of planning. A history of this agency-led initiative, as well as a discussion of the program's strengths, challenges and goals for the future are presented. PMID:14653629

Lindloff, S D

2003-01-01

380

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

381

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

382

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

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

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

383

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

384

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

385

The Value Added of Field Testing on Concrete Dams  

Microsoft Academic Search

In general, field testing of concrete dams has not been widely embraced by dam owners and it is not typically regarded as an essential component in the process of evaluating the seismic performance of these massive structures. Over the years, proponents of field testing and the use of measured response behavior to validate numerical models have had difficulty convincing the

Ziyad H. Duron; Enrique E. Matheu; Robert L. Hall

386

Nondestructive evaluation of concrete dams and other structures  

Microsoft Academic Search

This paper presents an overview of several stress-wave based nondestructive testing methods which can be used to assess the condition of concrete structures such as dams, buildings, and foundations. The specific methods to be presented include the use of the impact echo (IE) and spectral analysis of surface waves (SASW) methods in the assessment of dam concrete condition (including freeze-thaw

Larry D. Olson; Dennis A. Sack

1995-01-01

387

Geomorphology and American dams: The scientific, social, and economic context  

NASA Astrophysics Data System (ADS)

American geomorphologic research related to dams is embedded in a complicated context of science, policy, economics, and culture. Research into the downstream effects of large dams has progressed to the point of theory-building, but generalization and theory-building are from this research because (1) it is highly focused on a few locations, (2) it concerns mostly very large dams rather than a representative sample of sizes, (3) the available record of effects is too short to inform us on long-term changes, (4) the reversibility of changes imposed by dam installation and operation is unknown, and (5) coordinated funding for the needed research is scarce. In the scientific context, present research is embedded in a history of geomorphology in government service, with indistinct boundaries between “basic and applied” research. The federal policy that most strongly influences present geomorphological investigations connected with dams is related to habitat for endangered species, because the biological aspects of ecosystems are directly dependent on the substrate formed by the sediments and landforms that are influenced by dams. The economic context for research includes large amounts of public funds for river restoration, along with substantial private investments in dams; and geomorphology is central to these expensive issues. The cultural context for research is highly contentious and dominated by advocacy procedures that include intense scrutiny of any geomorphologic research related to dams. Advocates are likely to use the products of geomorphological research to make cases for their own positions.

Graf, William L.

2005-10-01

388

View of Dry Falls Dam Powerhouse (right) and headgates to ...  

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

View of Dry Falls Dam Powerhouse (right) and headgates to Main Canal (left) leading to Bacon Siphon and on to Billy Clapp Lake, looking northeast - Columbia Basin Project, Banks Lake Dry Falls Dam & Main Canal Headworks, South end of Banks Lake, Northwest of Coulee City, Grand Coulee, Grant County, WA

389

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

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

88. AVALON DAM - Photographic copy of construction drawing dated February 9, 1912 (from Record Group 115, Box 17, Denver Branch of the National Archives, Denver) METHOD OF CLOSING UP OLD GATE OPENINGS IN SPILLWAY AND ARRANGEMENT OF TURBINES, OPERATING CYLINDER GATES - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

390

18. Cross section of Mormon Flat Dam completed. Structure on ...  

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

18. Cross section of Mormon Flat Dam completed. Structure on parapet contains the operating mechanisms for the penstock gates. Power house is not yet under construction. Photographer unknown, 1926. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

391

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

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

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

392

RESEARCH ACTIVITIES ON THE EROSION MECHANICS OF OVERTOPPED EMBANKMENT DAMS  

Technology Transfer Automated Retrieval System (TEKTRAN)

The asset value of dams and flood defense structures in the US, EU, and around the world amounts to billions of dollars. Many dams are located close to centers of population and industry and the consequences of failure of these structures include the risk of both loss of life and property. Erosion...

393

Emergency Plan for Leech Lake Dam and Reservoir.  

National Technical Information Service (NTIS)

This plan implements the Corps program to prepare emergency plans for all Corps dams. It provides a guide for actions to identify and mitigate or respond to various types of emergencies which, while rare, could occur in the operation of Leech Lake Dam. Co...

1987-01-01

394

11. VIEW NORTH ALONG DOWNSTREAM BANK OF DAM FROM SOUTH ...  

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

11. VIEW NORTH ALONG DOWNSTREAM BANK OF DAM FROM SOUTH SIDE OF CHANNEL ON DOWNSTREAM SIDE OF RESERVOIR - Upper Doughty Dam, 200 feet west of Garden State Parkway, 1.7 miles west of Absecon, Egg Harbor City, Atlantic County, NJ

395

5. VIEW FROM TOP OF DAM ABOVE SPILLWAY LOOKING WESTERLY ...  

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

5. VIEW FROM TOP OF DAM ABOVE SPILLWAY LOOKING WESTERLY TO NORTHWESTERLY ACROSS RESERVOIR. TWO WATER INTAKE STRUCTURES AND FOOT BRIDGES IN FOREGROUND - Upper Doughty Dam, 200 feet west of Garden State Parkway, 1.7 miles west of Absecon, Egg Harbor City, Atlantic County, NJ

396

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

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

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

397

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

398

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

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

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

399

Development of next-generation embankment dam breach models  

Technology Transfer Automated Retrieval System (TEKTRAN)

The Dam Safety Interest Group (DSIG) of the Centre for Energy Advancement through Technological Innovation (CEATI International Inc.) is an international group of dam owners that pursues collaborative research on a wide range of topics. Since 2004 the DSIG has been working to facilitate the develop...

400

Performance of San Fernando dams during 1994 Northridge earthquake  

Microsoft Academic Search

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

J. P. Bardet; C. A. Davis

1996-01-01

401

TOLERABLE RISK FOR DAMS: HOW SAFE IS SAFE ENOUGH?  

Microsoft Academic Search

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 and value judgements. ICOLD (2005) ABSTRACT Risk assessment provides an opportunity to manage dam safety using a framework of risk evaluation that is used for other types of hazardous facilities and technologies. This

David S. Bowles

2007-01-01

402

Pressure dam bearing design for optimum turbomachinery stability  

Microsoft Academic Search

Design parameters and guidelines for the pressure dam or step journal bearings to suppress oil whirl instabilities are offered. Fixed-lobe bearings in use are seen to have low whirl instability threshold speeds. Oil whirl is a high speed or light load condition. The pressure dam or step journal bearing suppresses oil whirl, and allows operation above 6000 rpm without going

1982-01-01

403

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

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

70. AVALON DAM - Photographic copy of historic photo, August 5, 1911 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown AUTOMATIC GATES AT SPILLWAY NO. 1 - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

404

65. AVALON DAM Photographic copy of historic photo, c1910 ...  

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

65. AVALON DAM - Photographic copy of historic photo, c1910 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF U.S.R.S. ADMINISTRATIVE BUILDING (GATE KEEPER'S HOUSE) - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

405

71. AVALON DAM Photographic copy of historic photo, 1911 ...  

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

71. AVALON DAM - Photographic copy of historic photo, 1911 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown 'VIEW SHOWING CONSTRUCTION OF THE CYLINDER GATES' - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

406

62. AVALON DAM Photographic copy of historic photo, 1907 ...  

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

62. AVALON DAM - Photographic copy of historic photo, 1907 (original print located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW SHOWING CONCRETE DIAPHRAGM AND WORKERS - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

407

73. AVALON DAM Photographic copy of historic photo, C1912 ...  

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

73. AVALON DAM - Photographic copy of historic photo, C1912 (original print located at the Carlsbad Irrigation District office, Carlsbad, New Mexico) photographer unknown VIEW OF SPILLWAY NO. 2 - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

408

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

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

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

409

7. VIEW OF DAM 83, SHOWING DIVERSION GATES TO SOURIS ...  

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

7. VIEW OF DAM 83, SHOWING DIVERSION GATES TO SOURIS RIVER CHANNEL (LEFT) AND POND A (RIGHT) FROM THE WEST SIDE OF THE OUTLET CHANNEL, LOOKING SOUTHEAST (for view of the original diversion gate, see historic photograph, HAER No. ND-3-A-15) - Upper Souris National Wildlife Refuge, Dam 83, Souris River Basin, Foxholm, Ward County, ND

410

Colorado aqueduct system begins at impounded waters from Hoover Dam ...  

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

Colorado aqueduct system begins at impounded waters from Hoover Dam along with agreement made reserving use and ownership of several generators set to power pump houses downstream at Whitsett and beyond - Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

411

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

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

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

412

22. Lake Whitney Dam, 1895 Photocopied from an original photograph, ...  

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

22. Lake Whitney Dam, 1895 Photocopied from an original photograph, NHCHSL. Shows the rear of the dam building, and on Lake Whitney, Day's Store and Boathouse, and an ice house and steam-powered elevators. - Eli Whitney Armory, West of Whitney Avenue, Armory Street Vicinity, Hamden, New Haven County, CT

413

23. The Salt River, downstream, from atop Mormon Flat Dam. ...  

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

23. The Salt River, downstream, from atop Mormon Flat Dam. HEFU generator deck is at center bottom. Photographer Mark Durben, 1988. Source: Salt River Project. - Mormon Flat Dam, On Salt River, Eastern Maricopa County, east of Phoenix, Phoenix, Maricopa County, AZ

414

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

415

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

416

COOKE DAM POND AND UPSTREAM (WEST) SIDE OF (LR) NORTH ...  

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

COOKE DAM POND AND UPSTREAM (WEST) SIDE OF (L-R) NORTH EMBANKMENT (MI-98-A), SPILLWAY (MI-98-B), PENSTOCK ENTRANCES, POWERHOUSE (MI-98-C), AND SOUTH EMBANKMENT (MI-98-E). VIEW TO NORTHEAST - Cooke Hydroelectric Plant, Cook Dam Road at Au Sable River, Oscoda, Iosco County, MI

417

DESCHUTES PROJECT ? WICKIUP DAM ? CPS ASSIGNEES PLACING RIPRAP ...  

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

DESCHUTES PROJECT ? WICKIUP DAM ? CPS ASSIGNEES PLACING RIPRAP ON UPSTREAM FACE. DOZER SHAPING TOE OF RIPRAP. Photocopy of historic photographs (original photograph on file at National Archives, Rocky Mountain Region, Denver, CO). Unknown USBR Photographer, July 26, 1944 - Wickiup Dam, Deschutes River, La Pine, Deschutes County, OR

418

DESCHUTES PROJECT ? WICKIUP DAM ? VIEW OF UPSTREAM FACE ...  

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

DESCHUTES PROJECT ? WICKIUP DAM ? VIEW OF UPSTREAM FACE FROM RIGHT ABUTMENT. CPS CREW PLACING RIPRAP. Photocopy of historic photographs (original photograph on file at National Archives, Rocky Mountain Region, Denver, CO). Unknown USBR Photographer, July 26, 1944 - Wickiup Dam, Deschutes River, La Pine, Deschutes County, OR

419

Condition Survey of Lock and Dam 52, Ohio River.  

National Technical Information Service (NTIS)

A program to conduct a condition survey of Lock and Dam 52, which is located on the Ohio River near Paducah, Kentucky, was authorized and funded by the U. S. Army Engineer District, Louisville, in June 1972. Lock and Dam 52 was constructed approximately 4...

B. J. houston

1974-01-01

420

UPGRADING THE NRCS Y-14 DAM IN GWINNETT COUNTY  

Microsoft Academic Search

Suburban development of Gwinnett County has surrounded many of the flood control watershed dams that were built in the mid-1900s. In many cases, the watersheds and downstream reaches have developed significantly since the time of construction. Development has changed the runoff characteristics of the watershed and many homes are now in the breach zones of these dams. The spillways of

Gregg W. Hudock; Richard W. Humphries; Sam Fleming; Terry West; Kathryn J. Hatch

421

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

422

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

423

1. VIEW NORTH TOWARD DERBY. DAM IN CENTER OF PICTURE ...  

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

1. VIEW NORTH TOWARD DERBY. 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

424

Libby Dam Hydroelectric Project Mitigation: Efforts for Downstream Ecosystem Restoration  

Microsoft Academic Search

Construction of Libby Dam, a large hydropower and flood control dam occurred from 1966 to 1975 on the Kootenai River, near Libby, Montana in the Northwestern United States. Live reservoir storage is substantial, with water residence time of about 5 1\\/2 months (based on mean annual discharge of about 440 m³\\/s). Downstream river discharge and thermal regimes and the dependent

Charles

2009-01-01

425

The Removal of the Edwards Dam: Renewed Debates  

NSDL National Science Digital Library

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

Schultz, Jennifer J.

426

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

427

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

428

Rubber dam isolation in pediatric patients: a review.  

PubMed

The rubber dam has been available to the dental profession for over 145 years and can serve as an invaluable tool to dental practitioners. Here we review the rubber dam and its application on children including advantages and disadvantages associated with its use and alternative isolation methods. PMID:22439521

Karaouzas, Litsa; Kim, Youngjoo E; Boynton, James R

2012-01-01

429

76. AVALON DAM Photographic copy of historic photo, 1939 ...  

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

76. AVALON DAM - Photographic copy of historic photo, 1939 (original print in '1939 Annual Report of the Carlsbad Project,' located at the Carlsbad Irrigation District offices, Carlsbad, New Mexico) photographer unknown VIEW OF CCC WORKERS COMPLETING CONSTRUCTION OF SUSPENSION BRIDGE - Carlsbad Irrigation District, Avalon Dam, On Pecos River, 4 miles North of Carlsbad, Carlsbad, Eddy County, NM

430

The Relative Concentrations of Dam and Fetal Liver Glycogen  

Microsoft Academic Search

The composition of the blood of calves immediately following birth differs in certain respects from that of their dams. It was reported by Knodt, Shaw, and White (3) that the blood acetone bodies of calves at birth are significantly lower than that of their dams. Bodden and Allcroft (1) presented data demonstrating higher levels of blood sugar, serum calcium, inorganic

C. B. Knodt; W. E. Petersen

1944-01-01

431

Numerical model computes dam-break flows on dry beds  

Microsoft Academic Search

Most regulatory agencies insist that dam-break studies be performed before they will grant approval to a project. For such studies, engineers use numerical models to determine maximum water depths and discharges that sites downstream of the dam are likely to experience, and when the surge wave will reach those sites. Knowing the maximum water depths and discharges are useful when

Kahawita

1993-01-01

432

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

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

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

433

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

434

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

435

RSNN-Based Instability Disaster Prediction of Tailings Dam  

Microsoft Academic Search

The instability disaster prediction model of tailings dam had been established, based on system analysis of the factors that caused the instability disaster of tailings dam, by selecting 6 prediction index, medium unit weight, cohesion, internal friction angle, slope angle, slope height and pore pressure ratio and combining with using theory of the rough set and neural network. First the

Keping Zhou; Shuna Li; Qingfa Chen; Rui Chen

2009-01-01

436

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

Federal Register 2010, 2011, 2012, 2013

...Reclamation [INT-FES 10-43] Minidoka Dam Spillway Replacement, Minidoka County, ID AGENCY...prepared a FEIS on the proposed Minidoka Dam Spillway Replacement. The U.S. Fish and Wildlife...under NEPA; total replacement of the spillway and headgate structures; and...

2010-08-17

437

Controlling Works, Section AA at Bear Trap Dam, Section BB ...  

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

Controlling Works, Section A-A at Bear Trap Dam, Section B-B at Bear-Trap Dam, Section C-C at Sluice Gate - Chicago Sanitary and Ship Canal, Lockport Controlling Works, Illinois Waterway River Mile 293.2, Lockport, Will County, IL

438

China's Continuous Dam-building on the Mekong River  

Microsoft Academic Search

This article analyses China's hydro-politics along the Mekong River. It seeks to explain why China's unilateral dam-building projects on the upper reaches of the river have not been met with sustained criticism on the part of the downstream riparian countries, for which upstream dams are likely to have severe negative consequences. It is held that China has embarked on a

Sebastian Biba

2012-01-01

439

DESCHUTES. WICKIUP DAM. TWO 96" RING FOLLOWER GATE CASTINGS IN ...  

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

DESCHUTES. WICKIUP DAM. TWO 96" RING FOLLOWER GATE CASTINGS IN PLACE IN GATE CHAMBER. Photocopy of historic photograph (original photograph on file at National Archives, Rocky Mountain Region, Denver, CO). Unknown USBR photographer, June 2, 1940 - Wickiup Dam, Outlet Works, Deschutes River, La Pine, Deschutes County, OR

440

DESCHUTES. WICKIUP DAM. OPERATING MECHANISM OF 96" RING FOLLOWER GATES ...  

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

DESCHUTES. WICKIUP DAM. OPERATING MECHANISM OF 96" RING FOLLOWER GATES IN CONCRETE BLOCK POURED TO ELEV. 4276.25. M.E. WALSH, INSPECTOR. Photocopy of historic photograph (original photograph on file at National Archives, Rocky Mountain Region, Denver, CO). Unknown USBR photographer, June 26, 1940 - Wickiup Dam, Outlet Works, Deschutes River, La Pine, Deschutes County, OR

441

Review of proposed Glen Canyon Dam interim operating criteria.  

National Technical Information Service (NTIS)

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 c...

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

1992-01-01

442

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

443

WinDAM B earthern embankment overtopping analysis software  

Technology Transfer Automated Retrieval System (TEKTRAN)

Windows Dam Analysis Modules (WinDAM) is a modular software application being developed for the analysis of overtopped earth embankments and internal erosion. The development is being carried out in stages. The initial computational model development addressed routing of the flood through the rese...

444

Some aspects in the legal regulation of the dams.  

National Technical Information Service (NTIS)

In order to ensure high quality and low cost design and building of dams and appurtenant structures, as well as safe exploitation, it is obvious to have appropriate legislation. Keeping in mind that the dams are unique structures, for the design stage the...

L. Tancev

1996-01-01

445

Investigation of the Gold Creek Dam Spillway, Australia.  

National Technical Information Service (NTIS)

The Gold Creek dam is a 19th century structure located on the outskirts of Brisbane, Australia. Built between 1882 and 1885, the dam is an earth embankment, 16-m high, equipped with a lateral overflow spillway. The original unlined rock spillway was spoon...

H. Chanson R. L. Whitmore

1996-01-01

446

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

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

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

447

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.; Davis, C.A. [Los Angeles Dept. of Water and Power, CA (United States)

1996-07-01

448

Rubber dam usage for endodontic treatment: a review.  

PubMed

Rubber dam has been available to the dental profession for over 140 years. During this time, the use of rubber dam has been perfected, universally taught and recommended by professional organizations. Unfortunately, its consistent use has been rejected by many in the profession. The literature suggests that rubber dam is not used routinely by dental practitioners for root canal treatment. Many unfounded reasons have been cited for its lack of use, including concerns over patient acceptance, time required for application, cost of equipment and materials, insufficient training, difficulty in use and low treatment fees. Failure to use rubber dam has been shown to influence the choice of root canal irrigant, has a negative impact on treatment outcome and places the patient at risk of swallowing or aspirating materials and instruments. Methods to popularize rubber dam amongst general practitioners are discussed. PMID:19825034

Ahmad, I A

2009-11-01

449

Bivariate estimation of dam design floods  

NASA Astrophysics Data System (ADS)

Design floods for dams and reservoirs are often estimated on the basis of flood frequency analysis. This method consists of fitting a theoretical extreme-value probability distribution to the maximum annual flow rate data collected at a streamflow gauging station, thus enabling the hydrologist to estimate, via extrapolation, the flow rate or peak discharge corresponding to a given design return period. It is often the case that medium- to large-sized dams are designed by using return periods of up to 10,000 years. Even though fewer dams are under construction nowadays than in the past, it is also necessary to revise design flood from time to time, as new data become available, especially when retrofitting plans are underway. A design flood is fully characterized by a hydrograph, which is routed through the reservoir in order to determine its flood control capacity and the spillway design discharge. Nevertheless, flood frequency analyses often rely upon the estimation of probability distributions associated with peak discharges only. The determination of the design hydrograph is usually made through arbitrary procedures, such as assuming that its form is the same as the one corresponding to the hydrograph of the largest recorded flood. The simplest characterization of a hydrograph must involve, at least, its most important characteristics, namely: peak discharge, time to peak and volume. However, the authors of this paper have performed a sensitivity analysis that shows that the two most important parameters in characterizing a hydrograph, in terms of the response of a reservoir are the peak discharge and the runoff volume. Furthermore, experience demonstrates that the response of some reservoirs may be more sensitive to the flood runoff volume than to its peak discharge. Thus it is highly desirable to address the problem of characterizing the whole design hydrograph in a probabilistic framework. On the basis of these results, a new approach for estimating the design flood of dams and reservoirs has been developed. The method is based on the use of the bivariate extreme-value distribution of peak discharge and volume. Thus, an expression for the joint return period of these two parameters is derived. It is shown that an infinite number of pairs of peak discharge and volume possess a given joint return period. Hence, in order to determine the design flood hydrograph, a nonlinear optimization problem is posed. The solution of this problem represents the combination of values of peak discharge and volume that produces the worst effect on the reservoir for a given joint return period. The worst effect is obtained by choosing the combination of peak discharge and volume that produces the highest level of the water surface and, by correspondence, the highest flow through the spillway. The methodology was applied to the revision of several dams in Mexico finding that some of them are not as safe as it was supposed.

Aparicio, J.; Ramírez, A.; Aldama, Á.

2007-05-01

450

Channel evolution on the dammed Elwha River, Washington, USA  

USGS Publications Warehouse

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

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

2011-01-01

451

Check dam and polyacrylamide performance under simulated stormwater runoff.  

PubMed

High levels of turbidity and fine suspended sediments are often found in stormwater discharges from construction sites even when best management practices (BMPs) for sediment control are in place. This study evaluated turbidity reduction by three check dam types: 1) rock check dam representing a standard BMP, 2) excelsior wattle representing a fiber check dam (FCD), and 3) rock check dam wrapped with excelsior erosion control blanket (rock + excelsior ECB) representing an alternative FCD. Three check dams (all same type) were installed in a lined, 24-m ditch on a 5-7% slope and three consecutive simulated stormwater flows were run in the ditch. Additional tests were performed by adding granular polyacrylamide (PAM) on the check dams in the same manner using two sediment sources differing in clay content. Without PAM treatment, significantly higher effluent turbidity (>900 nephelometric turbidity units (NTU)) exited the ditch with rock check dams than with excelsior wattles or rock + excelsior ECBs (<440 NTU). The extent of sediment deposition between the check dam types was in the order of excelsior wattle > rock + excelsior ECB > rock check dam, indicating better water pooling behind the wattle. The PAM treatment reduced turbidity substantially (>75% relative to no PAM treatment) for all check dam types and it was very effective in excelsior wattles (<57 NTU) and rock + excelsior ECBs (<90 NTU) even during the third storm event. This study demonstrates that the passive treatment of runoff with PAM on FCDs (or rock + excelsior ECB) in construction site ditches can be very effective for sediment retention and turbidity reduction. PMID:24036092

Kang, Jihoon; McCaleb, Melanie M; McLaughlin, Richard A

2013-09-11

452

Science and Policy for River Restoration by Dam Removal  

NASA Astrophysics Data System (ADS)

In the past decade, science and policy for dam removal have undergone dramatic changes. With the experience of the removal of several hundred dams in the United States, several generalizations have emerged. Regarding science for dam removal, it has become clear that general upstream and downstream responses to removal are broadly predictable using established geomorphologic principles. Specific predictions are possible for low-head dams (less than about 10 m high), but experience with large structures (greater than about 20 m high) is still too limited to form dependable empirical conclusions. Observations of biological responses downstream show recovery of biota within two years or less. The cost of removing low head dams is turning out to be cheaper than commonly expected, with sediment management being the most expensive issue in many cases. Major barriers to dam removal include forecasting the appearance of the river after dam removal to provide reasonable science-based expectations for decision-makers and the public. An increasing common dilemma is the choice to remove a structure for environmental quality reasons, or to preserve the structure because of its historical significance. Four major unresolved issues are the (1) questions of how much sediment will remain in place in the reservoir basin after dam removal, (2) how long it will take downstream reaches to flush sediments released from the reservoir, (3) development of engineering principles for deconstruction of large dams, and (4) estimation of the cost for removal of large structures. In some cases, dam removal may result in a reduction of environmental quality by promoting the spread of invasive species or of toxic sediments.

Graf, W. L.

2008-12-01

453

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

454

The 1786 earthquake-triggered landslide dam and subsequent dam-break flood on the Dadu River, southwestern China  

NASA Astrophysics Data System (ADS)

Chinese historic documents recorded that on June 1, 1786, a strong M=7.75 earthquake occurred in the Kangding-Luding area, Sichuan, southwestern China, resulting in a large landslide that fell into the Dadu River. As a result, a landslide dam blocked the river. Ten days later, the sudden breaching of the dam resulted in catastrophic downstream flooding. Historic records document over 100,000 deaths by the flood. This may be the most disastrous event ever caused by landslide dam failures in the world. Although a lot of work has been carried out to determine the location, magnitude and intensity of the 1786 earthquake, relatively little is known about the occurrence and nature of the landslide dam. In this paper, the dam was reconstructed using historic documents and geomorphic evidence. It was found that the landslide dam was about 70 m high, and it created a lake with a water volume of about 50×106 m3 and an area of about 1.7 km2. The landslide dam breached suddenly due to a major aftershock on June 10, 1786. The peak discharge at the dam breach was estimated using regression equations and a physically based predictive equation. The possibility of a future failure of the landslide seems high, particularly due to inherent seismic risk, and detailed geotechnical investigations are strongly recommended for evaluating the current stability of the landslide.

Dai, F. C.; Lee, C. F.; Deng, J. H.; Tham, L. G.

2005-02-01

455

National Dam Safety Program. Purina Lake Dam (MO 31497), Missouri - Kansas City Basin, Franklin County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

The purpose of the inspection was to make an assessment of the general conditions of the dam with respect to safety, based upon available data and visual inspection, in order to determine if the dam poses hazards to human life or property. The inspection ...

R. S. Decker G. Jamison G. Ulmer H. P. Hoskins

1980-01-01

456

National Dam Safety Program. Hall Dam (MO 11038), Missouri - Nemaha - Nodaway Basin, Atchison County, Missouri. Phase I Inspection Report.  

National Technical Information Service (NTIS)

Hall Dam was inspected by an interdisciplinary team of engineers. The purpose of the inspection was to make an assessment of the general conditions of the dam with respect to safety, based upon available data and visual inspection, in order to determine i...

R. S. Decker G. Jamison G. Ulmer H. P. Hoskins

1980-01-01

457

Southwestern Coastal Basin, Greenwich, Connecticut. American Felt Dam CT 00043. Phase 1 Inspection Report. National Dam Inspection Program.  

National Technical Information Service (NTIS)

This dam is a concrete rubble and masonry construction with earth embankments on each side. The dam is approximately 208 feet long, 37 feet high and has to top width of 13 feet. It was constructed about 1867 and presently serves only an aesthetic function...

1980-01-01

458

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

National Technical Information Service (NTIS)

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

J. Tatalovich

1997-01-01

459

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

460

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

461

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

462

Bed Sediment Monitoring of Multiple Contiguous Small Dam Removals  

NASA Astrophysics Data System (ADS)

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 watershed-wide effort to remove or breach all major obstructions to restore the river to its original free-flowing state. The two dams were consecutively situated 1 kilometer apart and their removals provided an opportunity to study the geomorphic response in the form of bed elevation changes and sediment size through pre- and post-removal monitoring. Initial geomorphic surveys of the riverbed in the vicinity of and between the two dams have shown areas of erosion and deposition. These surveys have established a set of control points along the river channel between the two dams, and confirm the downstream movement of a sediment plume and localized areas of erosion. At the upstream dam, comparisons pre- and post-dam removal surveys show greater than 100 cubic meters of sediment being both eroded and deposited within the site. Most but not all of the erosion occurred around the newly exposed sediment bar upstream of the former dam, where the thalweg has reestablished itself following the dam’s removal. Areas that were excavated during removal have experienced deposition. Most of the deposition occurred downstream and on the left-hand bank. Due to the two low flow culverts in the former dam, a mid-channel sediment bar formed but has subsequently eroded. At the downstream dam site, erosion has removed up to 1.1 m of sediment from the bed in places while depositing up to 0.5 m sediment in others. As sediment from the former impoundment migrated through the project site, areas excavated during the removal became areas of deposition following the removal, and; alternately, areas in the channel margins where sediments were placed experienced gradual erosion. Grain size analysis shows a coarsening of the riverbed over the first nine months since removal. Grain size analyses were done upstream and downstream of the dam sites as well as at two locations between the sites. Pebble counts were completed using the random walk method at each of the six sites. The largest change in grain sizes at the four sites occurred upstream of the downstream dam site, where there was a significant coarsening of the sediment from October 2008 to June 2009. This has most likely occurred from the increase in energy upstream of the dam post-removal, which has transported many of the fine-grained sediments downstream. Downstream of this dam site sediment size has not significantly changed, suggesting that the fine sediments have been transported downstream far enough to leave the site. Surveys of the channel thalweg above and below both dams also show a pulse of sediment migrating slowing from the uppermost impoundment areas. Long-term monitoring of the channel thalweg may reveal reach-level changes in channel slope.

Galster, J. C.; Wyrick, J. R.

2010-12-01

463

Verifying Pressure of Water on Dams, a Case Study  

PubMed Central

Sensing and monitoring deformation pattern of dams is often one of the most effective ways to understand their safety status. The main objective of the present study is to find the extent to which rising reservoir level affects the mechanism of deformation of the Yamula dam under certain changes in the reservoir level conditions during the first filling period. A new dynamic deformation analysis technique was developed to analyze four geodetic monitoring records consisting of vertical and horizontal displacements of nine object points established on the dam and six reference points surrounding it, to see whether the rising reservoir level is responsible for the vertical and horizontal deformations during the first filling period. The largest displacements were determined in the middle points of the dam construction. There is an apparent linear relationship between the dam subsidence and the reservoir level. The dynamic deformation model was developed to model this situation. The model infers a causative relationship between the reservoir level and the dam deformations. The analysis of the results determines the degree of the correlation between the change in the reservoir level and the observed structural deformation of the dam.

Bayrak, Temel

2008-01-01

464

Three Gorges Dam affects regional precipitation  

NASA Astrophysics Data System (ADS)

The impact of the Three Gorges Dam (TGD) on regional precipitation is examined through analysis of the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM) rainfall rate and Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature and high-resolution simulation using the Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) fifth-generation Mesoscale Model (MM5). The independent satellite data sets and numerical simulation clearly indicate that the land use change associated with the TGD construction has increased the precipitation in the region between Daba and Qinling mountains and reduced the precipitation in the vicinity of the TGD after the TGD water level abruptly rose from 66 to 135 m in June 2003. This study suggests that the climatic effect of the TGD is on the regional scale (~100 km) rather than on the local scale (~10 km) as projected in previous studies.

Wu, Liguang; Zhang, Qiang; Jiang, Zhihong

2006-07-01

465

Minidoka Dam Wildlife Impact Assessment: Final Report.  

SciTech Connect

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

Martin, Robert C.; Meuleman, G. Allyn

1989-03-01

466

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

467

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

468

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

469

Earthen embankment overtopping analysis using the WinDAM B software  

Technology Transfer Automated Retrieval System (TEKTRAN)

Over 11,000 earthen embankment dams nationwide were constructed with Federal involvement during the last seventy years. Many dams were constructed in rural areas and originally classified as low hazard. With increased development near the dams and changing dam safety criteria the hazard classifica...

470

Do low-head dam reservoirs alter nitrogen and methane processing in riverine ecosystems?  

Technology Transfer Automated Retrieval System (TEKTRAN)

The majority of dams in the US are small, low-head dams that are less than 5 m in height. Reservoirs created by larger dams are known to serve as sinks for nitrogen and sources of methane. However, data demonstrating if similar trends exist with low-head dam reservoirs is lacking. Our research hypot...

471

Preferred Alternative Selection for the Buckeye FRS 1 Dam Rehabilitation Project  

Microsoft Academic Search

The Buckeye Flood Retarding Structure 1 (FRS1) is the westernmost dam of a system of three earthen flood control dams located along the western slopes of the White Tanks Mountains, paralleling the north side of Interstate 10 for 7.1 miles in Phoenix, Arizona. The three dams are interconnected and discharge west to the Hassayampa River. These dams built by the

PADINARE UNNIKRISHNA; ISAAC THOMAS

472

Removing Dams: Project-Level Policy and Scientific Research Needs (Invited)  

Microsoft Academic Search

More than 800 dams have been removed around the country, mostly ``small'' dams, under 25 feet in height. The total number of removals, however, is small relative to the number of deteriorating dams and the ecological impacts those structures continue to have on native riverine species and natural river function. The number of dam removal projects is increasing as aging

B. Graber

2010-01-01

473

SIMULATION TIGRIS RIVER FLOOD WAVE IN MOSUL CITY DUE TO A HYPOTHETICAL MOSUL DAM BREAK  

Microsoft Academic Search

Mosul dam is one of the biggest hydraulic structures in Iraq. It is located on Tigris River north Iraq and was selected as a case study to predict flood disasters caused by a hypothetical Mosul dam failure due to its foundation defect in which the dam had been survive since 1986 (initial time of dam operation). It is an earth-fill

Thair M. Al-Taiee; Anass M. M. Rasheed

474

Distributed hydrologic modeling of the Huai River Basin with high density of dams and floodgates  

Microsoft Academic Search

Huai River basin is a unique area in China with highest density of both water projects (dams and floodgates) and population. The construction of dams & floodgates substantially changed the basin's natural hydrological cycle. In this study, the dams & floodgates discharge simulation module of the Soil and Water Assessment Tool (SWAT) was extended to incorporate the dams & floodgates'

Y. Y. Zhang; J. Xia; Z. G. Wang

2009-01-01

475

Seepage problems in the right abutment of the Shahid Abbaspour dam, southern Iran  

Microsoft Academic Search

In this study, seepage phenomena through the right abutment of Shahid Abbaspour dam are investigated. The Shahid Abbaspour dam is a 200 m high arch dam, which regulates the waters of the Karun River, serves power generation, and flood control and irrigation needs. The dam site lies in the Zagros Mountains of southern Iran. This region presents continuous series of

M. H. Ghobadi; G. R. Khanlari; H. Djalaly

2005-01-01

476

The Effects of the Stronach Dam Removal on Fish in the Pine River, Manistee County, Michigan  

Microsoft Academic Search

Although dam removal has been increasingly used as an option in dam management and as a river restoration tool, there are few studies providing detailed quantitative assessment of the response of fish populations to dam removal. In this study, we document the response of the fish community in the Pine River, Michigan, to the gradual removal of Stronach Dam. Ten

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

2010-01-01

477

Horse Mesa Dam Maricopa County, Arizona: Photographs Written Historical and Descriptive Data Reduced Copies of Drawings.  

National Technical Information Service (NTIS)

The report provides a photographic record and drawings of Horse Mesa Dam, on the Salt River in Central Arizona. The narrative history of the dam is contained in the HAER No. 14, which documents Mormon Flat Dam downstream of Horseshoe Dam.

D. M. Introcaso

1989-01-01

478

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

479

Optical encoding with shaped DAM-1 molecular sieve particles.  

PubMed

This work introduces a new high-throughput screening particle - a Dallas Amphorous Material No. 1 (DAM-1) molecular sieve particle. In contrast to porous silica microspheres, the 2-8-microm sized DAM-1 molecular sieve particles are available in a variety of shapes and morphologies including spheres, hexagons, rods, gyroids, and discoids. The advantage of using DAM-1 molecular sieve particles is the ability to encode an array by particle shape, which in turn permits the repeated use of luminescent reporter dyes. In this technical note, we demonstrate optical decoding of fluorescein- and Texas Red-modified shaped molecular sieve particles using reflectance and fluorescence microscopies. PMID:15100795

Pantano, Paul; Meek, Claudia C; Wang, Jing; Coutinho, Decio H; Balkus Jr, Kenneth J

2003-04-23

480

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

481

Pressure dam bearing design for optimum turbomachinery stability  

SciTech Connect

Design parameters and guidelines for the pressure dam or step journal bearings to suppress oil whirl instabilities are offered. Fixed-lobe bearings in use are seen to have low whirl instability threshold speeds. Oil whirl is a high speed or light load condition. The pressure dam or step journal bearing suppresses oil whirl, and allows operation above 6000 rpm without going unstable. An analysis of the fixed-bore antiwhirl bearing follows. A summary of experimental-theoretical comparisons of pressure dam stability performances is recorded.

Nicholas, J.C.

1982-04-01

482

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

483

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

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

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

484

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

485

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

486

31. LOWER LOCKS AND DAM VIEWED FROM ACROSS THE CONCORD ...  

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

31. LOWER LOCKS AND DAM VIEWED FROM ACROSS THE CONCORD RIVER LOOKING WEST. LOCK CHAMBER VISIBLE THROUGH TREES IN LEFT CENTER: 1976 - Lowell Canal System, Merrimack & Concord Rivers, Lowell, Middlesex County, MA

487

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

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

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

488

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

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

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

489

Prediction of Total Dissolved Gas Exchange at Hydropower Dams, Report.  

National Technical Information Service (NTIS)

Total dissolved gas (TDG) supersaturation in waters released at hydropower dams can cause gas bubble trauma in fisheries resulting in physical injuries and eyeball protrusion that can lead to mortality. Elevated TDG pressures in hydropower releases are ge...

B. Hadjerioua F. K. Pasha K. Stewart M. D. Bender M. L. Schneider

2013-01-01

490

Using cyanoacrylate to facilitate rubber dam isolation of teeth.  

PubMed

Cyanoacrylate is an extremely strong bonding agent which has many applications in medicine. It is also effective in obtaining a leakproof seal of rubber dam around a structurally compromised tooth requiring endodontic therapy. PMID:1289480

Roahen, J O; Lento, C A

1992-10-01

491

5. FACING NORTHWEST; VIEW OF DAM FROM ROAD BRIDGE. CONTINENTAL ...  

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

5. FACING NORTHWEST; VIEW OF DAM FROM ROAD BRIDGE. CONTINENTAL EAGLE GIN CO. ON LEFT, SOUTH GABLE OF GURNEY MILL ON RIGHT. - Prattville Manufacturing Company, Number One, 242 South Court Street, Prattville, Autauga County, AL

492

Survey and Testing at Federal Dam, Leech Lake.  

National Technical Information Service (NTIS)

Test excavations at the location of campground improvement construction at the Federal Dam, Leech Lake River, Minnesota showed no significant archaeological remains will be damaged. One surviving prehistoric burial site exists on federal land but is not e...

E. Johnson

1975-01-01

493

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

494

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

495

2D Unstructured Dam-Break Model: Formulation and Validation.  

National Technical Information Service (NTIS)

Two-dimensional simulations of dam-break flows using finite volume method and approximate Riemann solvers for computing the intercell fluxes have drawn growing attentions because of their robustness and abilities to handle mixed flows and discontinuities....

J. Jorgeson S. S. Yang X. Ying

2006-01-01

496

Statistics of free surface flow through stochastic earth dam  

SciTech Connect

Even though soil is a highly variable material, the analysis of flow through earth dams typically proceeds deterministically and results can sometimes be quite misleading. In fact it is well known that soil permeability varies randomly from point to point in space and an improved earth dam model should incorporate this variability. In this paper the soil permeability in an earth dam of variable geometry is viewed as a weakly stationary spatially random field following a lognormal distribution with prescribed mean, variance, and spatial correlation structure. The mean and variance of the total flow rate through the dam and free surface drawdown are estimated using Monte Carlo simulations. A simplified empirical approach to the prediction of the mean and variance of the flow rate is presented to allow these quantities to be approximated easily and without resorting to simulation.

Fenton, G.A. [Technical Univ. of Nova Scotia, Halifax, Nova Scotia (Canada). Dept. of Applied Mathematics; Griffiths, D.V. [Colorado School of Mines, Golden, CO (United States)

1996-06-01

497

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

498

Engineering and Ecological Aspects of Dam Removal-An Overview.  

National Technical Information Service (NTIS)

Decommissioning and removing dams has emerged as one of the central foci of the new millennium for infrastructure management, river conservation, and the restoration of fisheries populations (American Institute of Biological Sciences (AIBS) 2002; Heinz Ce...

J. Conyngham J. C. Fischenich K. D. White

2006-01-01

499

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

500

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

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

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