Determination of weighting factor x, for Chaukhutia watershed of Ramganga reservoir

Abstract

The present paper outlines a strategy for computation of weighting factor (x) to compute the peak discharge for a given rainfall runoff event in a basin. The time invariant instantaneous unit hydrograph (IUH) was converted into unit hydrograph (UH) for each storm event. The peak and time to peak of runoff discharge are estimated for different storms of the basin by convolution of UH with rainfall excess (Re). The relative weights of the storm characteristics and basin parameters are also used in the prediction of peak. The Chaukhutia watershed of Ramganga reservoir catchment was selected to check the predicted results with respect to observed direct runoff hybrographs (DRHs). The theory provided excellent agreement for the basin(452 km2) area at the x value 0.30.