A SCS model based on geography information and its application on rainfall-runoff of typical small watershed on loess plateau

Based on the information data of land use,soil classification,hydrology and meteorology,a SCS model,developed by Soil Conservation Service(SCS),U.S.A.,is applied to simulate the rainfall-runoff relationship in Wangdonggou small watershed.The main conclusions are as follows:(1)Wangdonggou watershed is compartmentalized by some sub-units according to natural draining division,and the table of fitting CN values for Wangdonggou watershed is presented.(2) The hydrograph of calculated runoff process by the SCS model and the hydrograph of observed runoff process coincide very well in height as well as in shape,and the model is of high prcision above 75%.It has been shown that the SCS model can successfully be used to simulate the runoff generation and the runoff process of typical watershed on loess plateau,and the SCS hydrological model is a good means to study the rainfall-runoff relationship based on the geographical or remote sensing information.