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Morena Dam
Morena Dam is a rockfill dam across Cottonwood Creek, a tributary of the Tijuana River, in southern San Diego County, California in the United States. Originally completed in 1912 and raised several times afterward, the dam is one of the oldest components of the city of San Diego's municipal water system, providing between of water per year.〔 It is one of the few facilities in the San Diego water supply system that relies entirely on local runoff.
==Dimensions==
Morena Dam is located in the Cleveland National Forest at the headwaters of Cottonwood Creek, about east of downtown San Diego. The dam is high from the riverbed and long, with a height of from the foundations. Altogether the dam contains of earth and rock fill. At its full height, the reservoir can hold of water, covering .〔 The drainage area above the dam is and includes the tributary Morena Creek, for which the dam and reservoir are named.
Water is released via a long tunnel, fed by an intake tower that can draw up to water from different elevations of the reservoir. The spillway is located on the north side of the dam and has a crest long, topping out at above sea level. Flood flows through the spillway are controlled by steel flash gates high.〔 The spillway has a capacity of approximately .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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