Abstract—In this study, a hydrological model is developed by partitioning a river basin into many subbasins by stream-network approach. Soil Conservation Service's (SCS) Curve Number (CN) method in combination with Muskingum routing technique is applied to route the surface runoff from different sub-basins. Hydrologic Modeling System (HEC-HMS) simulation tool is successfully applied for processing the input rainfall data recorded over four rainfall stations namely, Simulia, Rangagora, Kharidwar and Tusama. The performance of the developed model is checked for two severe storms occurred over the catchment. Results indicate that, the predicted runoff volumes obtained from developed model are in good agreement with observed runoff value for both the cases.