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江苏省铜山县汉王乡二十五里沟小流域为奎河水系一条支流的上游,总面积7.14平方公里,其中耕地4489亩,占总面积42％。该流域内有一个行政村,五个自然村,八个生产组,2547口人,劳力1030个。流域三面环山,共有16个山头,土壤母质主要为碳酸钙,矿物质成分以结晶细粒方解石为主,含少量白云石,颜色多为深灰、浅灰色两种,土壤以褐色山红土为主。山上部灰岩裸露,中部和下部土层极薄,一般为20～30厘米,山间坡地土层较厚。 治理前,农田建设水平低,标准较好的水平梯田仅100余亩,占耕地面积的2％,林草覆被率不到10％,水土流失严重,平均年侵蚀模数达5000吨/平方公里,全流域年流失泥沙总量38450吨。
Hanwang Township, Tongshan County, Jiangsu Twenty-five Rift Valley watershed is a tributary of the upper reaches of the Que River, with a total area of 7.14 square kilometers, of which 4489 acres of arable land, accounting for 42% of the total area. The basin has an administrative village, five natural villages, eight production groups, 2,547 people, labor force 1030. There are 16 mountains on the three sides of the basin. The parent material of the soil is mainly calcium carbonate. The minerals are mainly composed of crystalline fine calcite and a small amount of dolomite. The color is mostly dark gray and light gray. The soil is brown mountain red clay the Lord. The limestone in the upper part of the mountain is exposed, the middle and lower soil layers are extremely thin, usually 20-30 cm, and the mountainous slope is thick. Before the treatment, the farmland construction level is low, the standard is better than only 100 acres of terraces, accounting for 2% of arable land, forest and grass coverage rate of less than 10%, serious soil erosion, the average annual erosion modulus of 5,000 tons / square Km, the total annual sediment loss of 38,450 tons of sediment.