Reservoir operation is very important part of planning and management of water resource system. Water in the reservoir can be used for Agricultural purpose as well as Electricity generation. An attempt has been made in this paper by using a linear programming for optimal reservoir operation of Reservoirs. Asia’s first hydro electric power station established in 1902 at Shivanasamudram. Karnataka was the first state to have longest transmission line in world in 1902 from shivanasamudram to Kolar gold Field covering distance of 147 KM. A case study of Mahadhayi River Project in Karnataka.