Published Paper Details:

Carry-over storages are over-year storages and will be able to hold flows more than the yearly requirement whereas with-in -year storages are provided to take care of seasonal variations of flows. When there are insufficient flows in the initial period the carry over storages will help in meeting the demands of this period as the flows from the previous year are stored in the reservoirs. They will also be helpful in improving the system performance by meeting the demands in deficit years with the carried forward flows. The deficit may be completely wiped out in some years where as in some years the quantum of deficit may reduce. Srisailam and Nagarjunasagar reservoirs in Krishna basin are provided as carry over storages. In this study an effort is made to study the effect of carry-over storages of Srisailam and Nagarjunasagar on the performance of the system of reservoirs Srisailam, Nagarjunasagar and Krishna delta of the Krishna system. The inflows are worked out at Srisailam, Srisailam to Nagarjunasagar, Nagarjunasagar to Prakasam barrage and the total inflows are compared with the demands planned on yearly basis and the success or failure of meeting the demands on annual basis is worked out. The study concluded that the success rates of irrigation at Srisailam, Nagarjunasagar and Krishna delta have improved with carry over storages. The improvement is marginal at Srisailam but more than 13% for Nagarjunasagar and Prakasam Barrage.