行政官僚や政治家にはまねができない勇気と勇敢と意気込み。
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Hoover Dam
http://ja.wikipedia.org/wiki/%E3%83%95%E3%83%BC%E3%83%90%E3%83%BC%E3%83%80%E3%83%A0
概要
フーバーダムは、1931年に着工し、1936年に竣工した。ルーズベルト大統領のニューディール政策の一環として建設されたとの話もあるが、着工は大統領就任の前である。ダムの建設作業にあたって熱射病のため122人が死亡した。また、1940年には貯水が原因と思われるM5の誘発地震が発生している。
建設当時の名称はボールダーダムだったが、1947年に建設当時の大統領ハーバート・フーヴァーにちなんで改称された。フーバーダムの堤頂の道路は、国道93号線である。片側1車線でボトルネックとなっているため、ダム直下にバイパス道路として日本の大林組によりコロラドリバー橋が建設された。
型式は重力式アーチダム、高さ221m、長さ379mで、ダム湖はミード湖と呼ばれ、貯水量は約400億トン。日本には約2,500基のダムがあるが、それらの貯水量の合計は250億トン程度である。日本最大の湖である琵琶湖の貯水量でも280億トン程度である。フーバーダムで発電された電力は、カリフォルニア州、アリゾナ州、そしてカジノで世界的に有名なラスベガス（ダムの北西48kmと近い）などに供給されている。
ダムの完成により、広大な乾燥地で灌漑農業を行うことが可能となったが、同時に下流域では塩類集積の害が見られるようになった。1961年、下流のメキシコは、1944年に締結した「コロラド川、ティファナ川およびリオ・グランデ川の水利用に関するアメリカとメキシコ間の条約」に違反し、国際水域を汚染したとしてアメリカへ抗議を行っている[1]。
フーバーダムは1985年にアメリカ合衆国国定歴史建造物に指定された。
ダム諸元
位置:北緯36度0分56秒、西経114度44分16秒
左岸所在:右岸所在:河川:コロラド川
目的:水位調整,発電,水道
型式:重力式アーチ
堤高:221.4m
堤頂長:379.4m
堤体積:250万立方m
流域面積:平方km
湛水面積:湛水面積639km²
総貯水容量:
有効貯水容量:344億m³
着手:1931年
竣工:1936年
ダム湖名称:ミード湖
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The story of Hoover Dam
アップロード日: 2009/12/12
ARC Identifier 37058 / Local Identifier 115.31. Explains the overwhelming need to control and regulate the raging waters of the Colorado River; the 1928 passage of the Boulder Canyon Project authorizing construction of the Hoover Dam; the ensuing construction of diversion tunnels and then the dam itself; building of support facilities, such as a steel fabrication plant for giant pipe construction; and creation of hydroelectric operations that provided electricity to California, Nevada, and Arizona. Also details how Lake Mead evolved into a successful recreational area as a result of the dam construction. Department of the Interior. Bureau of Reclamation. (06/20/1923 - 11/06/1979)
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Construction of Hoover Dam, 1933-1935
アップロード日: 2009/11/05
Originally called Boulder Dam, the Hoover Dam straddles the border of Arizona and Nevada. Construction began in 1933 and was completed two years later. Built with 3.2 million cubic yards of concrete, the dam is some 726 feet high, ranking 20th in the world for height. From 1939 to 1949 it was the worlds largest producer of hydroelectric power; today the dam generates some 4.2 billion kilowatt-hours of electricity annually. Lake Mead, the reservoir created by the dam, covers 247 square miles and is a major recreation area.
Construction footage of the building of Hoover Dam.
(U.S. Bureau of Reclamation, U. S. Department of the Interior)
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Hoover Dam and Hydroelectric Power Plant Tour Part 1
アップロード日: 2009/02/14
These are a series of video clips that I took when some friends of mine and I visited the Hoover Dam and Hydroelectric Power Plant back on December 28, 2008. Hoover Dam is located at Lake Mead at the Arizona and Nevada State line and just East of Las Vegas on US Highway 93. The highway goes over the dam, but a by pass bridge is being built across the Colorado River just down stream from the dam due to be completed in September of 2009. For more info about the bridge, go to
http://www.hooverdambypass.org/Whats_...
Video part 1 mainly shows the outside area of the dam as viewed from the visitor center observation area and from the top of the dam and part 2 are video clips are scenes taken inside some of the inner passage way tunnels and also inside one of the big main 650 feet long and 75 feet high generator halls with some good views of the water powered turbine generator units.
Additional information about Hoover Dam and Lake Mead
THE DAM
Type: Arch gravity
Height: 726.4 feet (221.3 meters)
Crest (Top) length: 1244 feet (379.2 meters)
Crest (Top) width: 45 feet (13.7 meters)
Base Width or thickness at bottom: 660 feet (201.2 meters)
Volume of concrete: 3.25 million cubic yards (2.6 million cubicmeters)
THE POWERPLANT
Commercial generating units: 17
Station service units (To run dam and power plant) 2
Nameplate capacity: 2080 megawatts (Including station service)
Length of each generator hall (Each building wing at bottom of dam by the river) 650 feet (198 meters)
Width of each generator hall (Each building wing at bottom of dam by the river) 55 feet
Height (Floor to ceiling) of each generator hall (each building wing at bottom of dam by the river) 75 feet (22.8 meters)
LAKE MEAD
Shoreline: 550 miles (885 Kilometers)
Capacity: 28,254,000 acre-feet (34.85 billion cubic meters)
Maximum depth: 498 feet (151.4 meters)
Surface area: 156,800 acres (63,455 hectares)
Length when full: 110 miles (177 kilometers)
These measurement figures are for the reservoir at the top of
conservation storage - elevation 1219.6 feet MSL (368.7 meters)
Official Hoover Dam website is at http://www.usbr.gov/lc/hooverdam/
Camera Used: Sony DSC-H2 digital still camera used in mpeg video mode.
Camera used for some of the still photo images:
Sony DSC-H50
Video shots were done by Bill Wolverton and the still photos were done by Jon Chauvie
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Hoover Dam and Hydroelectric Power Plant Tour Part 2
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Hoover Dam and Hydroelectric Power Plant Tour Part 3
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Hoover Dam and Hydroelectric Power Plant Tour Part 4
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