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一、流域基本概况老山沟小流域位于内蒙古自治区准格尔旗东北部大沟流域沟掌,为典型的黄土高原丘陵沟壑区,总面积39.4km2,水土流失类型以水蚀为主,水力侵蚀面积37.4km2,侵蚀模数12000t/km2·a,多年平均降水393mm,年平均气温7.4℃,无霜期150天左右。流域行政区划属准格尔旗大路
First, the basic profile of the basin Laoshan small watershed is located in Inner Mongolia Autonomous Region Zhungeer northeastern Dagou valley ditch palm, a typical loess plateau hilly area, with a total area of 39.4km2, water and soil loss type of water erosion, hydraulic erosion area of 37.4 km2, erosion modulus 12000t / km2 · a, average annual precipitation 393mm, annual average temperature of 7.4 ℃, frost-free period of about 150 days. Watershed administrative divisions Zhungeerqi avenue