TR(BR)-109 : Development of hydrological drought index based on dynamic ground water storage

Abstract

The depletion time of the Unicell model, which is a function of transmissibility of the aquifer has been identified as a criteria to hydrological drought indices for dynamic ground water storage. The depletion time not only gives the criteria for drought but also the estimates of the amount of dynamic ground water storage in the aquifer. This report covers the estimation of depletion time and development of drought indices based on the analogy of Unicell model. The developed drought indices has been verified and has also been used for the forecasting of hydrological drought in respect of dynamic ground water storage. The minimum amount of dynamic ground water storage, which will be available at different recurrence interval, has also been estimated for the sites of the Krishna basin.