Study on daily runoff process to the Nansha river basin based on SWAT model

Because of the shortage of long series of observed runoff data in Nansha river,SWAT(Soil and Water Assessment Tool) model were adopted to analyze daily runoff process in totally 16 measured cross-section in different return period(P=50%,P=75%,P=95%).Based on the information of DEM(Digital Elevation Model),land use plan,and soil categories of the Nansha river watershed in Beijing, a hydrological model was built with SWAT,and calibrated with observed precipitation and runoff data. Rationality analysis indicated the caculated results were reasonable.