CS(AR)-36/98-99 : Simulation of flood hydrograph using an event based rainfall-runoff model

Abstract

Present study deals with flood estimation of Narmada catchment upto Jamtara considering the catchment as ungauged and using the physical and geo-morphological characteristics of the catchment. Total area up to Jamtara being about 17100 sq. km., has been sub-divided into five sub-catchments for the purpose of flood estimation, and flood hydrograph for each sub-catchment is computed and routed through river reach to get the final flood hydrograph at Jamtara.

Flood hydrographs for individual sub-catchments are computed using geomorphological approach while routing of flood hydrographs is accomplished by using the Muskingum-Cunge routing method. Final flood hydrograph so computed is compared with the observed flood hydrograph at Jamtara. In total, five flood events are used in the analysis. The study demonstrates the use of methodology to compute the flood, where the catchment size is large and very little or no information except rainfall is available.