Thereafter, adopted KW parameters have been applied to calculate the design flood peak at the outlet of study area i.e. Validation of estimated KW parameters has been carried out in the catchment of river Alaknanda which is another significant tributary of river Ganga. Consequently, KW parameters have been calibrated by comparing the computed hydrograph with output hydrograph. output to the proposed model) of that river stretch. input to the proposed model) as well as at downstream point (i.e. Nakagami-m distribution based GIUHs have been fed at the upper (i.e. overland roughness and channel roughness) have been estimated for a stretch on river Bhagirathi, a tributary of river Ganga. KW equations have been solved through Preissmann implicit method. Routing of the hydrograph has been done by the Kinematic Wave (KW) approach. The Nakagami-m distribution has been used to compute Geomorphological Instantaneous Unit Hydrograph (GIUH) of different sub-catchments of upper Ganga river system because of non-availability of observed hydrograph. The SCS-CN method is used for rainfall excess computations. This is obtained by intensity duration frequency (IDF) relationship based on Self Recording Rain Gauge (SRRG) data of the study area. For design flood computations, 100-year return period of 1 h duration rainfall is adopted. This paper presents a study to develop a flood inundation model for partially gauged upper Ganga catchment. Flood inundation extent is highly dependent on intensive rainfall and topography of floodplain.

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