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无定河是黄河中游水土流失严重的一条较大支流,发源于陕西省靖边县白于山。在陕西省境内,流经榆林、延安两个地区的榆林、米脂、子洲、清涧、吴旗、子长等11个县。流域面积21615平方公里,占无定河流域面积的71.4%。建国以来,开展了流域综合治理,经过30余年的努力,取得了较大的增产减沙效益,积累了丰富的治理经验。截止1986年底,无定河流域共治理水土流失面积10703平方公里,占流失面积的49%。随着治理程度的提高,流域内自然面貌和农业生产基本条件,
Wudinghe is a large tributary of serious soil erosion in the middle reaches of the Yellow River, originated from Baiyunshan in Jingbian County, Shaanxi Province. In Shaanxi Province, it flows through 11 counties, including Yulin, Mizhi, Zizhou, Qingjian, Wuqi and Zichang, in the two areas of Yulin and Yan’an. The basin area of 21,615 square kilometers, accounting for 71.4% of the area of the Wudinghe basin. Since the founding of the People’s Republic of China, comprehensive management has been carried out in the watershed. After more than 30 years of hard work, great benefits have been achieved in yield increase and sediment reduction and a wealth of management experience has been accumulated. By the end of 1986, a total of 10,703 square kilometers of soil erosion had been managed in the Wudinghe River Basin, accounting for 49% of the total area lost. With the improvement of governance, the natural appearance of the basin and the basic conditions of agricultural production,