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• ASWAN DAM MODEL VERIFIED BY VIBRATION TESTS .
• The lower Aswan dam, constructed across the Nile in 1898-1902 under the direction of the famed British engineer, Sir Benjamin Baker, was hailed as an engineering marvel at the beginning of the twentieth century. The two-kilometer long gravity dam, originally 20 meters in heights, was raised twice, to 25 meters in 1912 and 34 meters in 1933, as illustrated in the accompanying figures. Construction consists of granite block and mortar walls, plus filling of the core with "Herculean Concrete" - rubble stones and mortar deposited, unmixed, by hand, and accounting for 40% of the volume of the dam. ... The lower dam was used to control the Nile flooding for the 1,000 kilometers between Aswan, Cairo, and the Mediterranean Sea, and revolutionized Egyptian irrigation and agriculture. The lower dam was also used for power production until it was replaced by the upper Aswan earth fill dam, built five kilometers upstream by the Soviets during 1960-1971. The upper dam impounds Lake Nassar and currently provides approximately 40% of Egypt’s electric power requirements. The lower dam continues to be important for tail race control at the upper dam, as a vital Nile road traffic crossing, and because the city of Aswan (with a population of approximately 200,000) lies directly below the lower dam. ...
• Over the past thirty years, grouting of the lower dam has been required to reduce leakage. Because of the required grouting and the location of the city of Aswan below the dam, the Egyptian High Aswan Dam Authority contracted with HARZA Engineers of Chicago to perform a complete evaluation of the dam, including its seismic adequacy. HARZA conducted extensive coring to determine dam integrity and to assess material properties for use in a dynamic finite element model. ... The variability of the unusual and undocumented construction materials suggested that dynamic vibration tests be used to measure global dynamic properties of the dam for use in verifying the computer finite element model. HARZA contracted with ANCO to perform field eccentric mass vibration tests on three section of the lower Aswan dam and lock. ...
• ANCO used its MK-18 eccentric mass vibrator to excite the dam with a sinusoidal force up to ten tons over the range of 1 Hz to 25 Hz. ... 0001 g were recorded and analyzed by spectral techniques to reveal a first transverse mode of dam vibration with a resonant frequency of 8 Hz. This information, along with the measured mode shape and dynamic stiffness, was used by HARZA to refine the assumed density and stiffness of the dam material properties in the finite element model used to predict seismic response. Using this verified model, HARZA was able to reduce the level of conservatism required in its analysis, which ultimately indicated that the Aswan dam had sufficient seismic capacity (resistance to uplift and sliding). ...

• The Aswan High Dam, when it was build created Lake Nasser, Lake Nasser Streches back 270 kilometres from the Dam. ...
• Unfortunately this dam has caused a big change to the lifes of farmers downstream from the dam. Usually when the river flooded once a year before the dam was built. ... But now, since the dam was built the annual flood has been stopped. ...
• The Aswan High Dam is also used to create hydro-electricity for Egypt,.
• Quote from a book in my school library:: "in the 1980's this dam was providing half of Egypt's Electricity, but by the 1990's this had fallen as energy demands increased. The electric power capacity of the Aswan High Dam is: 2. ... 8 GW in 1976, thus the percentage contribution by the High dam has decreased from over half the total electricity generation to less than 13%. ...
• Some of the Hydroelectric Generators at Aswan High Dam.
• When the Aswan high dam was built, the entire Temple of Abu Simel was shifted, so it wouldn't be flooded and destroyed when Lake Nasser filled up.

• That dam is one of them. If our generation has anything good to offer history, it's that dam. ...
• -- As recounted by Murray Morgan in the book The Dam .
• The Grand Coulee Dam, located on the Columbia river in central Washington, is the largest concrete structure in the United States. ... 5 million kilowatts of power, the dam irrigates over half a million acres of Columbia river basin farm land and provides abundant wildlife and recreation areas. ...
• Historical Overview Dam Photo Gallery Columbia Basin Irrigation Project Hydroelectric Power Generation Bibliography Related Links .

• The Los Angeles Dam Story .
• In 1971, the near-failure of a dam during a magnitude 6. ... In 1994, the replacement dam survived an almost identical earthquake with little damage. ...
• Perched above the densely populated San Fernando Valley, the Lower San Fernando Dam--predecessor to the Los Angeles Dam--holds a large reservoir, 1. ... Severe damage of the dam during the 1971 San Fernando earthquake forced residents to evacuate homes in a 6-mile-long area down the valley. ...
• The 1971 San Fernando earthquake shook loose a massive slide in the upstream slope of the Lower San Fernando Dam that lowered the crest about 30 feet. The slide carried away much of the crest and upstream concrete facing of the 2,100-foot-long dam. ... Had the reservoir behind the dam been at its maximum height, water would have overtopped and rapidly eroded the dam, flooding the valley below. The dam was constructed between 1912 and 1915 using construction methods that provided weak resistance to earthquake shaking. ...
• Moments after the San Fernando earthquake of 1971, only a thin dirt wall stood between 80,000 people in the San Fernando Valley of southern California and 15 million tons of water poised behind a heavily damaged dam. The 142-foot-high Lower San Fernando Dam was perilously close to failure. ... As it was, residents in an 11-square-mile area were forced to evacuate, while the water behind the earthen dam was lowered, a process that took 3 days. ...
• 7 shock was so heavy that the dam could not be repaired to safely hold its water supply in the event of another large earthquake. A replacement dam was needed--one designed to withstand strong ground shaking associated with earthquakes expected in the area. ...
• The design of the new Los Angeles Dam is a case in point. ... Hence, they recommended the new dam be designed to withstand shaking about three times stronger than that assumed in design studies prior to USGS consultation. ... Inasmuch as the new dam was to be financed with federal disaster assistance funds, the higher estimates of shaking were used in its design. ...

• You are in Research / Patrick Center / Current Projects / Manatawny Creek Dam Removal .
• Although dam removal clearly has great potential in river restoration, there is little scientific evidence documenting the scope and magnitude of the ecological changes associated with dam removal. As a result of Pennsylvania's leadership in dam removal, the PA Department of Environmental Protection (DEP), through the Growing Greener program, has funded several restoration projects including a few that focus on the ecological consequences of dam removal. ...
• In May 2000, the Patrick Center for Environmental Research (PCER) of The Academy of Natural Sciences, in collaboration with the Greater Pottstown Watershed Alliance, the Delaware Riverkeeper Network, and the Berks County Conservancy, began a two-year multi-disciplinary ecosystem study of the effects of removing the Manatawny Creek dam. This project represents one of the first comprehensive studies attempting to document the large-scale physical, chemical, and biological changes in a river system following dam removal. ...

• Home      Polage       Dam Name   Genealogical Reference.
• The Dam with Two Many Names.
• Surrounded by several hundred spectators and a handful of pickpockets, Wilbur announced that the dam about to be built in Black Canyon would be named for President Herbert Hoover: .
• I choose that of the great engineer whose vision and persistence has done much to make it possible and declare that the dam to be built under the Boulder Canyon Project Act shall be called the Hoover Dam. ...
• Originally, Hoover Dam was going to be built in Boulder Canyon, about forty miles up the Colorado River from Black Canyon. All through the 1920s as the Boulder Canyon Project Act, was argued in Congress, the media routinely referred to the proposed dam as the Boulder Canyon Dam or Boulder Dam.
• Even though as early as 1923 some favored Black Canyon as the dam’s site, debate over the two canyons went back and forth with Boulder Canyon the favorite choice. But a1928 disaster in southern California started the confusion over the dam’s name which was compounded in 1930 by Secretary Wilbur’s announcement.
• Francis Dam in San Francisquito Canyon above Los Angeles collapsed, killing more than 500 people as floodwaters roared across the Santa Clara Valley to the Pacific Ocean.
• Saint Francis Dam in ruins, 1928.
• Many in congress who were opposed to the construction of Hoover Dam seized this disaster as their argument: what would happen on the Colorado River if the Boulder Canyon Dam collapsed like the St. ... The dam site changed, but the name didn’t: even though Hoover Dam was built in Black Canyon, the Act which authorized it, passed by Congress and signed by President Calvin Coolidge on December 21, 1928, was still called the Boulder Canyon Project Act.
• Just two months later, on May 27, 1929, a Democratic Congressman from Colorado named Ed Taylor introduced a bill to name the dam after the new president, but his effort failed. Through the following 16 months in legal opinions issued from the Department of Justice, and in power and water contracts being negotiated by the government, the dam was referred to as either Boulder Dam or the Boulder Canyon Dam. Even the order Secretary Wilbur issued to Bureau of Reclamation Commissioner Elwood Mead on July 7, 1930 to begin construction on the Boulder Canyon Project mentioned Boulder Dam four times.
• Where the water and power contracts negotiated in 1930 originally noted Boulder Dam, the name was changed to Hoover Dam as the contracts were amended and published. During Congressional hearings on December 12, 1930 for the dam’s first appropriation, Congressman Ed Taylor, by now the ranking Democratic member of the Interior Department Subcommittee on Appropriations, made a florid speech justifying his committee’s "officially" noting the dam as Hoover in the appropriations bill before them: .

•   The proposed dam will flood a significant portion of the last remaining forest reserve in Selangor - including two thriving Orang Asli villages. ...
•   The residents of Kuala Kubu Baru remember the tragedy that occurred over a century ago in 1883, when a much smaller dam across the Selangor River burst and destroyed the entire town. They say the first District Magistrate and Revenue Collector, Cecil Ranking, tried to kill the crocodile penunggu (spirit guardian of the river) in defiance of the native superstitions - and within days a monstrous flash flood smashed the dam and buried Kuala Kubu town under tons of mud. ...
• Surely no one would want to live in the grim and deadly shadow of a 400-foot-high dam? Especially in an area where flash floods and landslides have increased dramatically in recent years, due to irresponsible logging upstream. ...
•   Once the dam is constructed, the area will no longer be natural. ... And since the Selangor Dam will only supply the water needs of the Klang Valley for three to six years at most, it cannot be regarded as a viable long-term solution. ...
• In the case of the proposed Selangor Dam, it is quite possible that the wetlands and famous firefly colony near Kuala Selangor will be adversely affected. ...
•   In this instance, the Selangor Dam will inevitably distort the geomagnetic field of the area, resulting in drastic long-term climatic and seismological changes - including the possibility of earth tremors in hitherto stable areas.   Apart from this, the streams and tributaries feeding the Selangor River - already polluted by recent logging on the hillslopes - will pour so much debris into the reservoir that it will need to be desilted every two or three years, adding to the enormous cost of maintaining the Selangor Dam. Furthermore, constructing a 5 km (3 mile) stretch of new road through hilly forest reserves to replace the inundated stretch will cause further environmental degradation, apart from greatly increasing the enormous cost of the dam project. ...
• COMMENTS ON THE DAM EIA REPORT  .
• RESPONSE TO THE DAM EIA REPORT .
• (to view MAP of the proposed dam site taken from the EIA report) .
• FOR TECHNICAL DETAILS OF THE SELANGOR DAM PROJECT .
• WHY DAM BUILDERS KEEP MAKING THE SAME MISTAKES. ...
• DAM THE VARIABLES .

• The Building of the First Aswan Dam and the Inundation of Lower Nubia:.
• In 1899, construction of the first Aswan Dam was begun. ... Even with these renovations, the first, or "Low," dam proved to have an inadaquate reservior area. In the event of extreme flooding, it would be necessary to open the sluices of the dam to relieve the water pressure against it, flooding the areas thought to be protected. A second dam was necessary at Aswan, and in the early 1950s, designs began to be drawn for what was to become the High Dam as Aswan. With the signing of the Nile Water Agreement by Egypt and the Sudan in November of 1959, work began on the second Aswan dam. ...
• The bulding of the High Dam at Aswan would have grave implications. Much of Lower Nubia would be submerged under the reservior created by the dam, destroying momuments and archaeological sites from the First to the Third Cataracts of the Nile River. ...
• Many of these photographs depict the building of the first Aswan Dam at the turn of the century. Others depict the canals and sluices of the dam shortly after construction. ...
• West Channel Masonry Looking East (from westernmost area of the dam).
• Western End of the Aswan Dam from Downstream.
• High Level Sluice, South Side of Dam.
• This view shows Philae before the completion of the first Aswan Dam.
• The reservior of the first Aswan Dam flooded the complex for much of each year. ...
• After the building of the first Aswan Dam, the reservoir waters could at times reach the feet of the seated figures. ...

• APPEAL TO JOIN THE INTERNATIONAL CAMPAIGN AGAINST THE CONSTRUCTION OF THE ILISU DAM, KURDISTAN – TURKEY.
• The GAP, financed by US and Turkish funds and in some cases by a pool of export credit agencies, is the world largest and more devastating project of dam construction. ... Today a steady international network is being formed with the target of strongly opposing the construction of the Ilisu dam, the largest ever planned in Kurdistan, that will be built on the river Tigris 65 km. ...
• The contract for the construction of the Ilisu dam has been put out to the Swiss companies Sulzer Hydro and ABB Power Generation, that, in turn, have granted a subcontract to an international pool including companies of many countries, among which the Italian Impregilo. ... The Swiss ERG is the sole company to have decided to grant its support, putting some conditions such as the non–use of the dam as a form of coercion against the neighbouring countries and the respect of international regulations on peopleís resettlement.
• The Ilisu dam will create a basin of 313 km² that will submerge a region with a huge population density and force more than 50 thousand Kurds to exile – according to information collected by a delegation of ìA Bridge to Diyarbakirî in 1997.
• The GAP history is full of such ruining: an typical case is that of the Harran plain, on the Syrian boundary, a mythical place of the history of civilization, where there was the legendary Temple of Sin, that is progressively disappearing under the waters of the Ataturk Dam, waters that bring with them diseases unknown before in these areas, such as malaria, schistosomiasis, leishmaniasis.

• Journal of the American Water Resources Association Bringing Down Our Dams: Trends in American Dam Removal Rationales.
• Dam Removal, Watershed management, River restoration.
• Although most dams continue to provide sufficient benefits to retain the structure, dam removal is becoming increasingly common. This study involved the construc- tion of a dam removal database to analyze spatial and temporal trends in dam removal. ... There is substantial geographic variability in dam removal rationales, with California leading in razing dams for environmental purposes, and Wisconsin leading in economic and safety rationales. States with substantial removals tend to have programs that support and fund dam razing. Although removals for safety reasons have been increasing steadily in the past three decades, environmental removals made a rather dramatic and sud- den entry into the dam removal arena in the 1990s. Analysis of spa- tial and temporal trends in dam razing are of particular significance given the likely increase in dam removals in the 21st Century. ...

• Multiple Flow Processes Accompanying a Dam-break Flood in a Small Upland Watershed, Centralia, Washington.
• Costa, 1994, Multiple Flow Processes Accompanying a Dam-break Flood in a Small Upland Watershed, Centralia, Washington: U. ... The dam failure occurred on a clear sunny morning after a prolonged period of dry weather. ... This report presents documentation of the failure mechanism, peak discharge, geomorphology, and sedimentology of the failure of a constructed dam in a small upland watershed. Such floods are poorly documented compared with rainfall-runoff or snowmelt floods, and present unique hazards because dam failures and resultant flash flooding can occur at any time without warning, even during sunny weather. ...

• You are here : SunsetCities > Hoover Dam.
• Hoover Dam .
•           °   Inside Hoover Dam Photos.
•           °   Hoover Dam Driving Directions.
•           °   Hoover Dam Photos - Historic and Current.
•           °   Hoover Dam Area Hotels .
• Hoover Dam  .
• Hoover Dam was for many years the largest dam in the world. ...
• If you drive to Hoover Dam from the Nevada side there is a build up as you get toward the dam by the narrow winding road which takes you down to the dam site. Dark, rocky canyon walls that angle sharply to the bottom of Black Canyon face you as you make hairpin turns along the canyon walls of the Nevada side down to Hoover Dam. ...
• An entirely different sight confronts you if you approach Hoover Dam from the Arizona side. You see the back of Hoover Dam and its intake towers. ...
• Here, I will try to give you an impression of what it looks like around Hoover Dam, a bit of information and a personal perspective. ... In February 2002 we were invited by Hoover Dam management to take the tour and as many photos as we wanted.
• The results of that trip are on almost all the pages particularly the Visitors Center and 'Inside Hoover Dam'. ...
• Long before there was a Hoover Dam, the Colorado River flowed uninterrupted along its 1,450 mile course from the Rocky Mountains to the Gulf of California. ...

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