Abstract:
This report examines the effect of periodicity in the rainfall records on the water availability of a basin. Based on the rainfall-runoff record of a shorter period, runoff series for a longer period is developed using a water balance model. Percent deviation in water availability estimations computed using a short term wet or dry record to that of complete record is examined. Effect of length of time series on the water availability estimates is also studied.
Results indicate that a minimum of seven and half years of record is needed for estimation of water availability on a monthly scale for Daman ganga basin and the effect of wet and dry spells play a crucial role in the determination of water availability.
