Estimation of runoff for small watershed using watershed modeling system WMS and GIS

Abstract

For many hydrological studies on an ungaged watershed, a methodology has to select for the determination of runoff at its outlet. The watershed modeling system is a comprehensive hydrologic modeling environment . WMS provides tools for all phases of watershed modeling including automated watershed and sub-basin delineation , geometric parameter computation, hydrologic parameter computation (CN , time of concentration , rainfall depth , etc) and result visualization, at the same time , the possibility of rapidly combining data of different types in a geographical information system (GIS ) has led to signification increase in its use in hydrological application. Watershed modeling system (WMS) is to be used with GIS in this study to estimate the surface runoff from wadi hasca watershed located beit kahil area in the Hebron district of the west bank . the morphological parameters for the same wadi will be determined. The geographical area of wadi hasca is 7.324 square kilometer , and the average annual rainfall is around 500 mm. the rainfall data for ten years will be used for the analysis and estimation of the direct runoff for the study area.