Hydroelectricity


Waterpower, power derived from the fall of water from a higher to a lower level, and extracted by means of waterwheels or hydraulic turbines (see Turbine). Waterpower is a natural resource, available wherever a sufficient volume of steady water flow exists. The development of waterpower today requires extensive construction, including storage lakes, dams, bypass canals, and the installation of large turbines and electric generating equipment. Because the development of hydroelectric power requires a large capital investment, it is often uneconomical for a region where coal or oil is cheap, even though the cost of fuel for a steam-powered generating plant is higher than the cost of running ...

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government would have to assume a major share in their construction. Motivated by the search for the multiple use of water resources, including navigation, flood control, and irrigation, in addition to power production, the Tennessee Valley Authority, or TVA, started government participation in large-scale waterpower development in 1933.
Most major installations depend on a large water-storage reservoir upstream of the dam where water flow can be controlled and a nearly constant water level can be assured. In contrast to storage-type plants, which depend on the impounding of large amounts of water, a few examples exist where both the water drop and the steady flow rate are high enough to permit so-called run-of-the-river installations; one such is the joint U.S.-Canadian Niagara Falls power project.
Although hydroelectric-power generation in the U.S. has increased from about 16 billion kWh in 1920 to about 280 billion kWh annually in the 1990, the percentage of electricity generated ...

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"Hydroelectricity." Essayworld.com. June 23, 2007. Accessed October 21, 2018. http://www.essayworld.com/essays/Hydroelectricity/66909.
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PAPER DETAILS
Added: 6/23/2007 05:22:12 PM
Category: Science & Nature
Type: Free Paper
Words: 506
Pages: 2

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