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一、工程概况大冲水库位于广西平南县官成公社,水库控制集雨面积4.11平方公里,枢纽由土坝、梯级放水管和滥洪道组成,合计土石方19.5万米~3。大坝原设计为粘土心墙坝,最大坝高27米,旁设宽顶堰溢洪道,有效库容37万米~3,设计灌溉面积1,200亩。工程由生产大队主持兴办,国家给以材料补助。由于工程量过大,修改设计时把坝高降为22米,有效库容为28万米~3,溢洪道加
I. Project Overview Dachen Reservoir is located in Guan County, Pingnan County, Guangxi. The catchment area of the reservoir is 4.11 km2. The dam consists of earth dam, cascade drain pipe and flood spillway. The total amount of earth and stone is 195,000m ~ 3. The dam was originally designed as a clay core wall dam, the maximum dam height of 27 meters, next to the weir overflow spillway, the effective storage capacity of 370000 meters ~ 3, design irrigation area of 1,200 acres. The project is to be run by the production brigade, and the state subsidizes the materials. As the project is too large, the design changes the dam down to 22 meters, an effective storage capacity of 280,000 meters to 3, spillway plus