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Barrett Dam
Barrett Dam is a concrete arch-gravity dam in southern San Diego County, California in the United States, forming Barrett Lake on Cottonwood Creek. The dam is part of the city of San Diego's local water supply system.
==Overview and operations==
Barrett Dam is located in a narrow canyon just below the confluence of Cottonwood Creek and Pine Valley Creek, about east of downtown San Diego.〔(【引用サイトリンク】title=Barrett Reservoir | Public Utilities: Water )〕 The dam is high above the riverbed and long, forming a reservoir with of usable capacity. The dam contains of concrete.〔 The spillway is located on the face of the dam and is a stepped overflow structure controlled by gates. At maximum water levels the spillway capacity is approximately . To prevent flash floods from overtopping the dam, the gates are left open during the rainy season from November 1 to April 1.〔
The dam's primary purpose is to store water for diversion through the Dulzura Conduit, a long concrete aqueduct which transfers water from the Cottonwood Creek basin to Lower Otay Reservoir. Water is released into the Dulzura Conduit via an outlet tower and a diameter pipe with a capacity of .〔 Water stored at Lower Otay passes through the Otay Water Treatment Plant before entering the municipal system. Barrett is one of two dams on Cottonwood Creek, the other being Morena Dam upstream. Because Barrett is a deeper and narrower lake than Morena and experiences less evaporation, the city prioritizes water storage in Barrett. Water is moved downstream from Morena as long as storage space is available in Barrett. Resultantly, Barrett Lake is usually at a high level except during periods of extended drought.
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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