 Terai region, a granary of Nepal, is prone to flooding and inundation. Kandra River is a flashy river having very low flows during the dry periods.  But, upon heavy rainfall, floods develop quickly with little warning, resulting in disastrous consequences for communities.  The hydrological and hydrodynamic modeling with 24h accumulated (1day) rainfall and mean daily discharge would not replicate the real scenario.  This study attempts to assess the responses of the basin with different

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... erns and magnitudes of rainfall.  Due to the lack of real-time/hourly interval rainfall information, we employed unit-hydrograph approach for rainfall-runoff analysis. Snyder's method was used.  Three virtual rainfall hyetographs (fore, center and rear intensity rainfall) were then developed for different return periods.  A 2-D shallow-water unsteady flow model was used to simulate runoffinundation.  It is found that for the rainfall of higher return periods, the rear intensity pattern produced greater inundation area whereas, for the lower return periods, the center intensity did.  When precipitation falls on the basin, FLASHY Rivers like Kandra River, start to rise up and again they go down very quickly.