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2024-10-25 14:08 本頁面
【正文】 he dam is used for flood and silt control, electric power, agricultural irrigation, and domestic water is also a major sightseeing destination, with almost one million visitors per year going on tours through the Dam is 726 feet(221metres)high and 1,244 feet(379metres)long at the contains 4,400,000 cubic yards(3,360,000 cubic metres)of reinforcedconcrete intake towers located above the dam divert water from the reservoir into huge steel pipes called water, after falling some 500 feet(150metres)through the pipes to a hydroelectric power plant in the base of the dam, turns 17 Francistype vertical hydraulic turbines, which rotate a series of electric generators that have a total power capacity of 2,080 than half of the generated electric power goes to the Metropolitan Water District of Southern California, the city of Los Angeles, and other destinations in southern California。the rest goes to Nevada and dam, power plant, and reservoir are owned and managed by the of the Interior’s Bureau of Dam is named in honour of Herbert Hoover, the during whose administration(1929–33)construction began on the dam and whose work as merce secretary in the 1920s secured agreements necessary for the project to legislation passed by Congress in 1931 officially named the dam for Hoover, officials in the succeeding administrations of Franklin and Harry referred to it as Boulder Dam, its name during the planning stages before 1947 Truman signed a congressional resolution restoring the structure’s formal name to official the time of the dam’s construction, a federal highway traversed the dam’s crest, serving both visitors to the dam and travelers between Nevada and the dam and surrounding Lake Mead recreation area rose in popularity, traffic increased, and the problem became especially severe under security restrictions imposed after the attacks of , began on a longplanned Hoover Dam Bypass Project, and in October 2010 a concrete arch bridge with a 1,060foot(322metre)span—the longest in North America for that type of bridge—opened for through traffic within view of Hoover old road along the crest is reserved for use by visitors to the Aswan High DamThe first Aswan dam, built in 1889 when Egypt was under British control, was to irrigate cash crops such as sluice gates of the first dam were opened during the flood season to let the floodwaters proceed unimpeded Nile flood originates in the Ethiopian highlands, the source of the Blue Nile, during the monsoon deposited by the floodwaters forme
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