Simulation of Rainfall-Runoff in Qaraso Basin, Iran

Abstract

This paper provides a method that by using hyologic models we can determine risk and flood prone zones within basin and also determines flooding intensity at each sub-basin. First, the basin in the geographic information system (GIS) using ArcHyo amendment was divided into 14 sub-basins and then the physical characteristics of the basin and sub-basin using ArcHyo were entirely determined by climate and land use and using WEAP model required simulation of hyological catchments and the total for each subbasin have been done. Resulted calculations from the model indicate that the contribution level of the small and large sub-basins in the flood basin outlet does not depend on sub-basin discharge quantity and subbasins with more discharge do not necessarily have more contribution in the outlet discharge. In other words, the sub-basins have shown a type of non-linear behavior. In this regard, the sub-basin A9 has the most critical condition among the sub-basins regarding impact on the basin outlet flood. On the other hand, among other effective factors on the basin outlet discharge and the sub-basins, the R. F. F was observed as the most important factor in terms of its impact on the basin outlet flood and control.