Gal oya National Park in Sri Lanka was established in 1954 and serves as the main catchment area for "Senanayake Samudraya", the largest reservoir in Sri Lanka. "Senanayake Samudraya" was built under the Gal oya development project by damming the Gal oya at "Inginiyagala" in 1950. Gal oya reservoir currently defined as "Senanayake Samudraya" is the largest and very special among other reservoirs in Sri Lanka in various manners. Gal oya Scheme is one of the largest 4 modern irrigation projects of Sri Lanka. This scheme involved the restoration of a number of ancient medium scale reservoirs & construction of the "Senanayake Samudraya" (7680 ha), the largest reservoir in the history of Sri Lanka. "Senanayake Samudraya" is one of the main project of the Scheme. Senanayake reservoir which consist a catchment area of 384 square miles has been constructed by the earthen dam of which is 3600 feet in length and 140 feet in height comprising 2 million cubic yards of soils. This can store 770000 acre feet capacity of water. A concrete spill of which is 1020 feet in length has been constructed far away from the main dam to inspections. It is 770 feet in spill length and 60 feet in height comprising 6 doors and distributes water by the sluice with 13 feet in diameter. From 1954 to 1965 the park was administrated by the Gal oya Development Board until the Department of Wildlife Conservation took over administration. The National Park is situated 314 km from Colombo The Gal oya Development Board established several protected areas to protect the catchment areas of "Senanayake Samudraya" and several other reservoirs.
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