Runoff Prediction in an Ungauged Catchment of Upper Deduru Oya Basin, Sri Lanka: A Comparison of HEC-HMS and WEAP Models

Modsarajah Rajendran, E.R.N. Gunawardena, N.D.K. Dayawansa


Runoff prediction from ungauged catchment has always been a challenging task, requires transfer of hydrologic information from gauged to ungauged catchments. However, it is not clear whether information transfer among nearby catchments is suitable across a wide range of climatic and geographic regions. In this study, stream flow data of a gauged catchment (Tittawella tank) were used for calibration and validation of HEC-HMS (Hydrological model) and WEAP (Water resource model). Watershed area ratio technique was adopted to simulate runoff from an ungauged catchment (Hakwatuna Oya) and the results were compared. The simulated flows generated by both models in calibration and validation showed good agreement with observed flows. Monthly flows simulated by both models were quite similar. Although HEC-HMS enables runoff simulation on daily basis with better prediction of peaks, necessary for flood forecasting, monthly simulation is adequate for water managers to take management decisions. Therefore, WEAP as a single model can be used for both runoff simulation and taking management decisions in Hakwatuna Oya catchment.


HEC-HMS, hydrological modelling, ungauged catchment, WEAP.

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