Application of Arc-GIS, HEC-GeoHMS and HEC-HMS in a holistic sense for estimation of rainfall-runoff process: case study over Ballikaya Basin

In this paper, the relationship between rainfall and runoff is examined according to SCS-CN method based on DEM, soil land use maps over Ballikaya Watershed. For applicability of method, firstly, basin physical characteristics are compiled in Arc-GIS environment. Then, parameters related properties processed via HEC-GeoHMS, continuous rainfall-runoff simulations estimated by HEC-HMS. The simulation conducted with five different objective function methods, evaluations model performance explained addition graphical methods metrics including NSCE, MRE PCC. Results show that HEC-HMS capture time peak although predictions slightly underestimate value flows volume. Nevertheless, fluctuation simulated well respect observed hydrographs watershed during both calibration verification periods. addition, obtained values study hydrograph rivers Watershed have potential be predicted computer environment without any need from gauging measurements. can used investigate drought flood risks region only weather forecasts for future studies.