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一、流域的自然概况 洪水沟系三川河的一级支流,干沟长11公里,流域面积23.87平方公里,有1公里以上的沟道6条,1公里以下的沟道60条,沟壑密度4.6公里/平方公里,海拔高程950-1200米,总面积中坡度在7度以下的占7%、7—15A的占8%、15—20度的占125、20—25度的占22%、25—35度的占15%、35度以上的占36%。侵蚀类型属于黄土丘陵沟壑区第一副区,流域基岩为砂岩和
First, the natural profile of the basin Flood channel is a tributary of the Sanchuan River, dry gully 11 km long, the basin area of 23.87 square kilometers, with more than 1 km channel 6, 1 km below the channel 60, gully density 4.6 Km / km2, elevation of 950-1200 meters, the total area of 7 degrees in the slope below 7 degrees, 7-15A accounted for 8%, 15-20 degrees accounted for 125,20-25 degrees accounted for 22% 25-35 degrees accounted for 15%, 35% of the above 36%. The erosion type belongs to the first sub-district in the gully region of the Loess Plateau. The bedrock of the drainage basin is sandstone