Calibrating HEC-HMS model with limited spatial information: A case study in Nong Son watershed, Thubon river, Vietnam

In solving the problem, this study developed a calibration procedure of HEC-HMS model with four steps for reducing parameter’s uncertainty and improving model performance, which include (1) identifying the number of sub-basin, (2) determining the optimal combination of loss model and transform model, (3) finding out the sensitive model parameters, and (4) further calibrating model.