There are 81 dams in Kerala. Of the 81 dams, the Kerala State Electricity Board owns 59 dams which form 45 reservoirs, the Kerala Irrigation Department owns 20 dams which form 20 reservoirs and the Kerala Water Authority vests the control of 2 dams with 2 reservoirs. Three dams - Munnar Headworks Dam, Lower Periyar Dam, and Maniyar Dam - have no drainage area across the river.