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The rainfall runoff model is one of the most frequently used events in hydrology. It determines the runoff signal which leaves the watershed from the rainfall signal received by the basin. Numerous methods have been developed by different researchers to simulate the rainfall runoff process. However most of the methods are lump in nature. In the lump approach, average rainfall and uniform catchment characteristics are considered in devlopining the model. If the spatial variations of rainfall and catchment characteristics are significant, lump approach will not give accurate results. The present study develops an distributed approach to simulate the rainfall runoff process of a catchment. The catchment area has been divided in to the numbers of divisions equal to the numbers of rain gauge station. The rainfall in a particular rain gauge is considered as uniformly distributed over the entire sub catchments. Spatially …