The dam with a Crest Length of 520 m and Height of 122 m made Kotmale store

history channel documentary Despite the fact that the need of a dam was seen in 1950, two or three years taking after the freedom from the frontier British rulers, it was just in 1961 the preparatory investigations of the Kotmale task were completed by the Government of Sri Lanka in association with US Agency for International Development (USAID) and after that again by UNDP-FAO from 1964 to 1968. Amid the period somewhere around 1973 and 1976, a possibility study was completed by the water and Power Development Consultancy Services (India) Limited (WAPCOS). In 1979, Sir William Halcrow and Partners in relationship with Messrs Kennedy and Donkin and the Central Engineering Consultancy Bureau (CECB)of Sri Lanka were named to give consultancy administrations: development work initiated in February 1979; repository was appropriated in November 1984; business power era started in June 1985; ritualistically appointed in August 1985.

The dam with a Crest Length of 520 m and Height of 122 m made Kotmale store, which at its full limit manages 174 million cubic meters of waters of the Kotamale Oya River. The water in this manner appropriated is used first for the hydro electric force era. The commitment to the national force framework of Sri Lanka by hydro power at Kotmale adds up to no under 206 megawatts. At that point the water is released to join the intersection of Mahaweli ganga stream and the Atabaghe Oya waterway. In any case, then all the great things include some major disadvantages. Sri Lanka paid an overwhelming cost for Kotmale dam, supply, passage and underground hydro power station. Kotmale venture is one of the five head works undertakings of the super venture of Mahaweli River Diversification, the biggest (advanced or antiquated) watering system conspire ever in the island.