Effet de la subdivision d'un bassin versant sur le débit de pointe dans la modélisation pluie débit par HEC-HMS

Abstract

Watershed subdivision into sub watershed make the understanding of the hydrological behavior easier as it is important to represent the process of runoff modeling.This subdivision has with no doubt effect on the peak discharge .Therefore, several models which transform rainfall into runoff have been developed in order to simulate the hydrographs . In that respect, this study is elaborated through hydrologic modeling system HEC-HMS applied on watershed of Wadi Reghaia which represents the principal river in the area in .The main objective is to compare unsub-divided watershed with subdivided one (in term of hydrologic subdivision ,series subdivision and parallel subdivision ).