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(一) 陕西省西北部泾河、渭河流域的中游地区,系由高塬阶地区、高塬沟壑区和丘陵沟壑区所组成;其中除高塬阶地区一般的尚可利用河水、井水进行引溉和提灌外,由于高塬沟壑区,塬高沟深,地下水位低;丘陵沟壑区地势起伏,山大坡陡,因而引水鑿井都较困难。加以这两类地区均为粉沙黄壤,质地疏松,全年降雨多以暴雨形式集中于7～9月份,径流冲刷严
(1) The middle reaches of Jinghe and Weihe River basins in the northwestern part of Shaanxi Province consist of highland area, highland and gully area and hilly areas; in addition to the general availability of river water and well water in highland area Irrigation and irrigation, because of the highland gully area, high ditch high gully, low groundwater level; hilly and gully area terrain ups and downs, steep slopes, and therefore dredging more difficult. Both of these areas are silty yellow silt, with loose texture. Heavy rains throughout the year are mainly concentrated in July-September, with heavy runoff erosion