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长武县鸭儿沟流域面积54.5平方公里。从1973年以来,为了从根本上控制水土流失,促进商品经济的发展,根据流域内原、坡、沟地貌演变发展关系及土壤侵蚀规律,以及流域内67％的径流量来自原面,泥沙量的86.7％来自坡沟的水土流失特点,把流域内原、坡、沟作为相互有机联系的整体,全面规划,综合治理,以保原固沟为主攻方向,配置原、坡、沟三层保护综合体,迄今已初具规模,并发挥了显著效益,促进了全流域经济的发展。至1985年,流域内年均土壤侵蚀量由17.35万吨下降为5.03万吨;年径流量从2989万米~3下降为159.7万米3;粮食总产量从359.9万公斤上升为758.9万公斤;农业总产值从230.71万元提高为567.65万元。
Changwu County duck ditch drainage area of 54.5 square kilometers. Since 1973, in order to fundamentally control soil and water loss and promote the development of commodity economy, according to the evolution of landform, slope and ditch evolution in the basin and the law of soil erosion, as well as 67% of the runoff in the basin come from the original surface, sediment amount Of the 86.7% from the slope ditch soil erosion characteristics, the basin of the original, slope, ditch as the organic whole of each other, comprehensive planning, comprehensive management, to protect the original gully as the main direction of the distribution of the original, slope, trench protection complex , Has so far taken shape and has played a significant role in promoting the economic development of the whole basin. By 1985, the average annual soil erosion in the basin dropped from 173,500 tons to 50,300 tons; the annual runoff dropped from 29,890,000 meters to 3,979,000 cubic meters; the total output of grain increased from 3,599,000 kg to 7,589,000 kg; Gross agricultural output increased from 2.3071 million yuan to 5.6765 million yuan.