APPLICATION OF YIELD MODEL FOR SRISAILAM RESERVOIR PLANNING AND OPERATION

Abstract

Water resources projects planning and operation needs knowledge of reservoir yield. Reservoir yield is the amount of water that can be supplied from the reservoir in a specified interval of time. The successfulness of the project depends on the reliability to what extent the water is made available during the failure years. Here the yield model is applied to estimate the optimal annual yields of the Neelam Sanjeeva Reddy Sagar (Srisailam) project of Andhra Pradesh on river Krishna. The yield model is a special technique, to estimate yield. by screening with specified reliability and extent of availability. It is an implicitly stochastic linear programming-screening model that incorporates several approximations to reduce the size of the constraints needed to describe the reservoir system operation and find the desired target releases for a particular reliability. Neelam Sanjeeva Reddy Sagar (Srisailam) project of Andhra Pradesh is the first major hydroelectric project constructed across the River Krishna, which is second biggest river in peninsular India. The maximum quantity of water of this river is tapped by existing reservoirs. This project, originally in 1960s, was formulated for generation of hydropower. Subsequently the project has taken shape of a multipurpose reservoir by including drinking water supply to Chennai city (Telugu Ganga Project) and Irrigation facility to within and adjacent basins of Krishna in Andhra Pradesh (A.P.). Projects in the upstream like Almatti and Jurala are, under construction. So their water use have been taken into consideration in this thesis. All the seven units of the hydropower plant came into operation by March 1987. During the period 1987 to 1992 an average annual energy of 2833.6 M.Kw.hrs has been generated with 15839 million cubic meters of water draft. These values have been used for comparison with the model result. A considerable impact has been noticed in this study. Initially, the model is tested for the existing condition then each component's effect has been studied under different criterion. The operation rules described in reports of Andhra Pradesh and guidelines issued by the K.W.D.T are also taken into consideration; the same has= been studied under different cases of time periods in the model.