1概况小堵麻河是发源于祁连山的一条小河流，属典型的山溪性河流，年径流量1864万m3，河道平均纵坡1／50，河床组成以卵石、砾石和大颗粒沙为主。河道坡陡流急，河床活动性很强，汛期推移质粒粗量大，由于上游河段未加治理，加之现有引水设施效果差，干渠磨损及泥沙淤积较严重 1 Overview Small plug Mahe is a small river originated in the Qilian Mountains, is a typical mountain stream rivers, the annual runoff of 18640000 m3, average longitudinal slope of 1/50, composed of pebbles, gravel and large particles of sand . The steep slope of the river slope is acute and the bed activity is very strong. The coarse and coarse plasmid in the flood season is large. Due to the unreasonable treatment of the upper reach, coupled with the poor effect of the existing water diversion facilities, serious damage to the canal and sediment deposition