Comparison of Two Hydrological Models, HEC-HMS and SWAT in Runoff Estimation: Application to Huai Bang Sai Tropical Watershed, Thailand

In the present study, streamflow simulation capacities between Soil and Water Assessment Tool (SWAT) Hydrologic Engineering Centre-Hydrologic Modelling System (HEC-HMS) were compared for Huai Bang Sai (HBS) watershed in northeastern Thailand. During calibration (2007–2010) validation (2011–2014), SWAT model demonstrated a Coefficient of Determination (R2) Nash Sutcliffe Efficiency (NSE) 0.83 0.82, 0.78 0.77, respectively. same periods, HEC-HMS values 0.80 0.79, 0.84 0.82. The exceedance probabilities at 10%, 40%, 90% 144.5, 14.5, 0.9 mm flow duration curves (FDCs) obtained observed flow. From models, these indices yielded 109.0, 15.0, 0.02 mm, 123.5, 16.95, mm. These results inferred those high flows captured well by model, while medium model. It is noteworthy that low accurately simulated both models. Furthermore, dry wet seasonal reasonably with slight under-predictions 2.12% 13.52% to values. under-predicted 10.76% 18.54% flows. study will provide valuable recommendations stakeholders HBS improve water usage policies. addition, be helpful select most appropriate hydrologic humid tropical watersheds Thailand elsewhere world.