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延川县属黄土丘陵沟壑区,植被差,汛期7、8、9三个月降雨量占年雨量64％,暴雨多,水土流失严重,旱季河水断流,水资源贫乏,基本上是十年九早。群众说:“天旱水断流,滴水贵如油,春种秋不收,农民望天愁”。因此,调节河川径流修建蓄水工程,是我县解决水源问题的一项重要措施。但是,在水土流失区建库,汛期洪水含沙量大,水库淤积严重,据统计我县已成水库淤积量已占蓄水库容45％左右,大量投资兴建的蓄水工程,有的水库使用时间不长即失去效益,如1971年修建的马家湾水库,至1977
Yanchuan County is a loess hill and gully area, poor vegetation, flood season 7,8,9 three months of rainfall accounted for 64% of annual rainfall, heavy rainfall, soil erosion, dry season, the river is poor, basically water resources, basically ten years Nine early. The masses said: “Drought water flow off, dripping water as oil, spring autumn do not accept, peasants looking anxiety.” Therefore, the regulation of runoff construction of water storage project is an important measure to solve the water source problem in our county. However, in the construction of water and soil loss areas, flood season sediment concentration is large and the reservoir siltation is serious. According to statistics, the sedimentation amount of reservoirs in our county has accounted for about 45% of the reservoir capacity, a large amount of investment and construction of water storage projects, and some reservoirs Lack of benefits came from a short period of time, such as the Majiawan Reservoir built in 1971 to 1977