解放以来,陕西省在黄土高原沟壑区、黄土丘陵沟壑区与河源区修建了许多中小型水库,这些水库在发挥灌溉、防洪等作用方面都收到了显著效益。但是,由于该地区暴雨集中,地势陡峻,植被不良,水土流失十分严重,因而水库泥沙淤积异常迅速,兴利、防洪库容很快地减少或丧失,水库抗洪能力和灌溉效益也都相应地降低。另外,在 Since the liberation, many small and medium sized reservoirs have been constructed in the gully area of ​​the Loess Plateau, the gully areas of the Loess Plateau and the Heyuan area. These reservoirs have received significant benefits in terms of irrigation and flood control. However, due to heavy rainfall, steep terrain, poor vegetation and serious soil erosion, the reservoir sedimentation is abnormally rapid, and the flood control and flood control capacity is rapidly reduced or lost, and the reservoir flood control ability and irrigation benefit are correspondingly reduced . In addition,