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- Q7336309 subject Q8166203.
- Q7336309 subject Q8166876.
- Q7336309 subject Q8492710.
- Q7336309 abstract "Glen Canyon Dam, a concrete arch dam on the Colorado River in the U.S. state of Arizona, has been associated with a large amount of risk, most notably the risk of its siltation and failure. Because of high silt content carried in by the Colorado and San Juan rivers, Lake Powell is gradually filling with sediment, decreasing its capacity; eventually the sediment will build up against the dam and affect its safe operation.The dam, anchored in unstable Navajo sandstone (sometimes said to be "solidified sand dunes"), nearly failed in 1983 as the result of a flood on the upper Colorado River. Siltation, degradation of concrete and reinforcements, spillway operational problems, and unstable dam abutments are all key factors that affect the safe operation of the dam. It is estimated that a breach of the dam would produce a floodwave that would overtop the Hoover Dam. As the dam's useful lifespan is estimated by some to be no more than 85 to 100 years, the dam has been called "America's most regretted environmental mistake" by David Brower, then-head of the Sierra Club. Other estimates, by the Bureau of Reclamation and others suggest a lifespan of between 500–700 years.".
- Q7336309 thumbnail Glen_Canyon_Dam_from_Colorado_River.jpg?width=300.
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- Q7336309 wikiPageWikiLink Q8166203.
- Q7336309 wikiPageWikiLink Q8166876.
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- Q7336309 comment "Glen Canyon Dam, a concrete arch dam on the Colorado River in the U.S. state of Arizona, has been associated with a large amount of risk, most notably the risk of its siltation and failure.".
- Q7336309 label "Risks to the Glen Canyon Dam".
- Q7336309 depiction Glen_Canyon_Dam_from_Colorado_River.jpg.