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A saddle dam is an auxiliary dam constructed to confine the reservoir created by a primary dam either to permit a higher water elevation and storage or to limit the extent of a reservoir for increased efficiency. An auxiliary dam is constructed in a low spot or "saddle" through which the reservoir would otherwise escape.
For this type of reservoir only a small portion of the water held behind the dam is useful. Therefore, knowing the purpose for which a reservoir has been constructed, and knowing how much water can be used for that purpose, helps determine how much water is in possible reserve.
A reservoir (/ ˈ r ɛ z ər v w ɑːr /; from French réservoir [ʁezɛʁvwaʁ]) is an enlarged lake behind a dam, usually built to store fresh water, often doubling for hydroelectric power generation.
By general definition, a dam is a barrier that impounds water or underground streams, hence tailings dams are relegated to a separate list. Data on volume of structure is not as easily available or reliable as data on dam height and reservoir volume.
The nearly 8100 major dams in the United States in 2006. The National Inventory of Dams defines a major dam as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3).
Djorf Torba Dam; Keddara Dam; Koudiat Acerdoune Dam; Meraldene Dam; boughrara Dam; Beni Bahdel Dam; Mafrouch Dam; Sikak Dam; Sidi Abdelli Dam; Ain Tolba Dam; Sarno Dam
The flushing flow method involves partially or completely emptying the reservoir behind a dam to erode the sediment stored on the bottom and transport it downstream. [7] [6] Flushing flows aim to restore natural water and sediment fluxes in the river downstream of the dam, however the flushing flow method is less costly compared to removing dams or constructing bypass tunnels.
The largest reservoir in Tasmania is the 12,359-gigalitre (2,719 × 10 ^ 9 imp gal; 3,265 × 10 ^ 9 US gal) Lake Gordon in the South West region of the state, formed by the Gordon Dam. As of 2015 [update] , 44 per cent of all the dams in Tasmania were constructed for the purpose of generating hydro-electricity .