STREAMFLOW ROUTING IN THE INDIAN ARID ZONE

A lumped model for streamflow routing in arid ephemeral channels has b een developed. The governing equations for movement of flood waves sub jected to transmission losses are simplified through a time averaging process to develop an ordinary differential equation describing transm ission losses as a function of distance, inflow, channel width, time p arameters of flow and effective hydraulic conductivity. The resulting equation has an analytical solution and simulates runoff volume and pe ak discharge rates for individual storm events. The outflow hydrograph is fairly well approximated with a triangular approximation. The mode l is simplified and constructed to require a minimum of observed data for calibration. It can also be used for ungauged basins in arid regio ns through parameterization.