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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.
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.
As completed, O'Shaughnessy Dam is 910 feet (280 m) long, spanning the valley at its narrow outlet. [2] The dam contains 675,000 cu yd (516,000 m 3) of concrete. The Hetch Hetchy Reservoir created by the dam has a capacity of 360,400 acre⋅ft (0.4445 km 3), with a maximum area of 1,972 acres (798 ha) and a maximum depth of 306 feet (93 m). [2]
Since there is only an extremely low flow within the reservoir so no water level gradient, the head can be clearly seen: where the farthest watercourse discharges into the reservoir. Upstream of the actual reservoir is likely to be a pre-dam, which typically have a constant water level so the head is reinforced.
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).
A dam is a water reservoir in the ground, confined by a barrier, embankment or excavation, on a pastoral property or similar. The term is found widely in South African , Australian [ 1 ] and New Zealand English, and several other English dialects, such as that of Yorkshire .
Ayer Itam Dam; Babagon Dam; Bakun Dam; Batang Ai Dam; Batu Dam; Bekok Dam; Beris Dam; Betotan Dam, Sandakan; Bukit Merah Dam; Chenderoh Dam; Kenyir Dam; Kinta Dam, Perak