Rainfall-Runoff Modeling Using the HEC-HMS Model for the Al-Adhaim River Catchment, Northern Iraq

It has become necessary to estimate the quantities of runoff by knowing amount rainfall calculate required water storage in reservoirs and determine likelihood flooding. The present study deals with development a hydrological model named Hydrologic Engineering Center (HEC-HMS), which uses Digital Elevation Models (DEM). This was used means Geospatial Modeling Extension (HEC-GeoHMS) Geographical Information Systems (GIS) identify discharge Al-Adhaim River catchment embankment dam Iraq simulated rainfall-runoff processes. meteorological models were developed within HEC-HMS from recorded daily data for years 2015 2018. control specifications defined specified period one day time step. Soil Conservation Service-Curve number (SCS-CN), SCS Unit Hydrograph Muskingum methods loss, transformation routing calculations, respectively. two calibration year verification values. results showed that both observed hydrographs highly correlated. model’s performance evaluated using coefficient determination 90% verification. dam’s considered successfully but slightly overestimated. indicated is suitable simulations river catchment.