OPTIMAL PARAMETER-ESTIMATION FOR MUSKINGUM ROUTING WITH UNGAUGED LATERAL INFLOW

A Muskingum flood routing model coupled with an impulse response rainf all-runoff model for ungauged lateral inflows is presented. The model is designed to estimate the runoff hydrograph at a downstream point gi ven runoff hydrographs at one or more upstream locations, and estimate d rainfall hyetographs for ungauged catchments. A constrained, non-lin ear (successive quadratic) programming algorithm is used to estimate t he parameters of this model from historical data. These parameters inc lude the Muskingum K and x, the attenuation coefficient and the flow v elocity of the impulse response function for the ungauged catchment. T ests of the model with synthetic situations and with a data set for th e Godavari river reach in India are presented.