陕北秃尾河的二级支沟杨畔沟,属黄土丘陵沟壑区第一副区,流域面积2.76平方公里,侵蚀模数约15000t/km~2.1972年开展流域治理时,首先在沟道下游修坝高12米、总库容为20万立方米的拦洪淤地坝一座(即1号坝),接着1973年于沟口修建一座库容为4万立方米的小水库,在小水库下游用劈崖填沟的方法造成沟滩地30多亩,并 The Yangzi ditch, a secondary branch of the Tuwei River in northern Shaanxi Province, is the first sub-district in the gully region of the Loess Plateau. Its drainage area is 2.76 square kilometers and its erosion modulus is about 15000 t / km ~ 2. When carrying out watershed management in 1972, Dam 12 meters high, with a total capacity of 20 million cubic meters of a flood dam a dam (ie, No. 1 dam), then built in 1973 in Mizoguchi a storage capacity of 40,000 cubic meters of small reservoirs in the lower reaches of the reservoir with a split Cliff ditch method ditch beach caused 30 acres, and