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Kanwar Sen, also spelt as Kanwar Sain OBE (1899–1979) was an eminent civil engineer from Rajasthan state in India. He was the Chief Engineer in the Bikaner state who came up with idea of Rajasthan Canal. He successfully implemented Gang canal project too. He was considered a doyen of irrigation engineering of his time. He was born in 1899 in Tohana in Hisar district (Haryana). He was educated at D.A.V. College, Lahore.He graduated as a civil engineer from Thomason College of Civil Engineering, Roorkee (now, IIT Roorkee) in the year 1927 with hons. He was awarded Padma Bhushan in 1956. He has written a book called -Reminiscences of an engineer. He was chairman of Central Water and Power Commission, Ministry of Irrigation and Power, Government of India. Kanwar sain and Karpov (1967) presented enveloping curves for Indian rivers.

During his span of 80 years Dr. Kanwar Sain won great honours, including O.B.E., and Padma Bhushan.

He was offered the Order of the Elephant by the Government of Thailand, but could not accept it, as he was serving with the United Nations. He was elected as President of Central Board of Irrigation and Power in 1953, Vice President of International Commission on Irrigation and Drainage 1954 and President of Institute of Engineers India in 1956.

He was awarded Honorary Life Membership by the American Society of Civil Engineers and Honorary Life Fellowship by the Institution of Engineers India. His own alma mater, the University of Roorkee (Now Indian Institute of Technology, Roorkee), conferred on him the Honorary Doocrate of Engineering. For nearly half a century, the name of Dr. Kanwar Sain has been a byword for river projects and development of water resources both in India and abroad.He was closely connected with major projects-from the Damodar Valley to the Rajasthan Canal, from Hirakud Dam, to the Narmada Project.

Besides, he contributed his utmost in design and building up the Central Water and power Commission Dr. Sain’s passionate involvement with his work-especially in saving Dibrugarh from floods and during the mishap at the Bhakra Dam endeared him to his colleagues, both in India and abroad. His greatest achievement was his association with the Mekong Development Project for nine years as an UN expert. He has also been associated with the preparation of a Master Plan for the Development of the Narmada River.