北沿口骨干工程是宁夏同心县长沙河流域四大控制性工程之一，是由黄河上中游管理局、宁夏区计委、宁夏水利厅水保局共同投资兴建的集拦泥、蓄水、灌溉。防洪、调节下游水量综合性功能的大型骨干工程。该工程控制流域面积137km‘，上游库区全为上石质山区，植被稀疏、居住人口稀 North margin of the backbone project is one of the four major controlled projects in Changsha County, Tongxin County, Ningxia, by the Yellow River Upper Middle Authority, Ningxia Planning Commission, Ningxia Water Resources Bureau jointly set up by the Bureau of Soil and Water Conservation set the mud, storage, irrigation. Flood control, regulating the comprehensive function of downstream water, a large backbone project. The project control basin area of ​​137km ’, the upper reaches of the reservoir area are all on the stony mountainous area, vegetation is sparse, residential population is sparsely populated