Exam III World of Water

Exam III World of Water - Exam III World of Water Study...

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Exam III World of Water 05/11/2007 21:22:00 Study Guide Exam III World of Water 1. Know the date of the earliest recorded dam. Around 2600 B.C. 2. Know 4 functions of modern dams. Flood Control Irrigation Redistribution Recreation Navigation Electricity 3. Know the basic components of dams (e.g. face, abutments). Face : exposed surface of the structure Abutments : sides of the dam Crest : top of the dam Toe : natural ground surface Outlet : opening to discharge water Spillway : chute to allow excess water flow 4. Know the dam storage zones (e.g. active storage) Dead Storage : water below the principal outlet
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Flood Pool Storage : reserve used to store flood water Active Storage : Total capacity- dead and flood Surcharge : temporary flood storage (controlled release) Freeboard : difference between top of dam and maximum water suface 5. Know the 3 dam types and basic features. Gravity Concrete: straight and the mass is more Concrete Arch: it is arched Earthen Embankment: more than 50% compacted earth 6. Know what act began the majority of dam building in the U.S. Reclamation Act in 1902 7. Know the basic features of the 3 major dams discussed. Hoover Dam: (Boulder Canyon Dam) o One of 11 major dams o Completed in 1935 o Cost: $175 million o It is a concrete gravity arch o 726 ft. high, 1244 ft. length, 660 ft thick at base, and 45 ft thick at crest o Lake Mead is the reservoir behind the dam with 10.5 trillion gallons of water, 581 ft deep, and 110 miles long Grand Cooley Dam: o Concrete gravity Dam o Columbia River in Central Washington
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Constructed in 1933-1941 o Largest concrete structure in the U.S. (8 million cubic meters) o 550 ft. high, 5223 ft long, and 500 ft wide at base, and 30 ft wide at crest Kingsley Dam: o Earthen Dam o Ogallala Nebraska o North Platte River o Constructed in 1936-41 o Has a Steel and Clay core, as well as contains sand, gravel, and soil o Width=3.5 miles, Height= 162 ft, Base thickness= 110 ft, and crest thickness=28 ft 8. Understand the basics of power generation in Hoover Dam (drop, water speed, penstock) Hoover Dam: 180 m drop to turbine Water flowing from Lake Mead through the gradually-narrowing penstocks to the powerhouse reaches a speed of about 85 miles per hour by the time it reaches the turbines 9. Know the reason the 3 major dams were constructed in the 1930s. The Great Depression: happened in 1929-1941 The United States Bureau of Reclamation because over 25% of the U.S. population was unemployed And Manufacturing was down 50% so to produce revenue and jobs people were sent to build dams 10. Know the single largest construction project and its dimensions. The Three Gorges Dam on the Yangtze River
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Exam III World of Water - Exam III World of Water Study...

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