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Evaluating the Performance of HEC-HMS and SWAT Hydrological Models in Simulating the Rainfall-Runoff Process for Data Scarce Region of Ethiopian Rift Valley Lake Basin

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Document pages: 18 pages

Abstract: A number of physically-based and distributedwatershed models have been developed to model the hydrology of the watershed.For a specific watershed, selecting the most suitable hydrological model isnecessary to obtain good simulated results. In this study, two hydrologicmodels, Soil and Water Assessment Tool (SWAT) and Hydrological EngineeringCentre-The Hydrologic Modeling System (HEC-HMS),were applied to predict streamflow in Katar River basin, Ethiopia. Theperformances of these two models were compared in order to select the rightmodel for the study basin. Both models were calibrated and validated withstream flow data of 11 years (1990-2000) and 7 years (2001-2007) respectively.Nash-Sutcliffe Error (NSE) and Coefficient of Determination (R2)were used to evaluate efficiency of the models. The results of calibration andvalidation indicated that, for river basin Katar, both models could simulatefairly well the streamflow. SWAT gave the model performance with the R2 > 0.78 and NSE > 0.67; and the HEC-HMS model provided the modelperformance with the R2 > 0.87 and NSE > 0.73. Hence, thesimulated streamflow given by the HEC-HMS model is more satisfactory than thatprovided by the SWAT model.

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