Hirakud is the world longest dam built across the river Mahanadi, about 15 km from Sambalpur in the state of Orissa in India. It was first post independence major river valley project in India. The proposal of Hirakud dam was initiated by Sir M. Visveswararya in 1937 to tackle the problem of floods in the Mahanadi delta. Later on 1945, under the chairmanship of Dr. B.R. Ambedkar, the then the Member of Labour in Government of India, that the potentialities of the Mahanadi river should be investigated properly for the multipurpose use. The construction of the dam began in March 1946 and the project report was submitted to the government in 1947. the project came to an end in 1953, which was formally inaugurated by the Prime Minister of India - Pandit Jawaharalal Nehru on 13th January 1957.