Flood hydrograph simulation model

Abstract

A model with a minimum number of parameters has been conceived and developed to simulate direct runoff hydrographs when given3the required input data. Rainfall and runoff data from 39 storms over four watersheds were used for this purpose. The model takes into account both the basin and rainstorm characteristics. A computer model was developed for the computations.The physical aspects of the model are expressed by division of the drainage area into isochronal sub-areas.Formulae were developed which permit computations of water loss parameters as variables dependent on antecedent precipitation. These formulae, together with a watershed lag, obtained by optimization or by the measurement of basin parameters, were used to simulate the runoff hydrograph for a watershed.The model was applied to Runnets watershed which has not been used for the development of the model. Good agreement was found between the simulated and observed hydrographs.