Why Are Dams Built?

Answer

Dams are built to serve quite a number of services such as generating electricity and supplying water for day to day activities. They are also known to control flooding of water and enhancing river navigation.
2 Additional Answers
Dams are build to restrict the flow of water into a specific area. Dams are built to block the water until a certain height is reached. Dams prevent water from spilling into public areas and roadways.
Damns are built to provide proper irrigation without flooding areas. It stops most of the water and in some cases only lets a bit of it flow through.
Q&A Related to "Why Are Dams Built?"
Dams can be built by animals, nature itself or they can be man made. Beavers put logs and sticks in front of flowing water to form a dams.
http://answers.ask.com/Science/Nature/how_are_dams...
A key element in understanding how the Hoover Dam was built is to understand how the dam's engineering works. The dam is an arch-gravity design, combining the virtues of the arch-style
http://www.ehow.com/how-does_5245117_hoover-dam-bu...
Construction of Hoover Dam began on April 20, 1931, the dam was completed on March 1, 1936.
http://wiki.answers.com/Q/When_did_they_start_buil...
Even in 1889, many called the old dam and water the "Old Reservoir," as is had been built many decades before. The dam was envisioned by the state of Pennsylvania (and Sylvester
http://www.nps.gov/jofl/faqs.htm
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