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Abstract
koshi Barrage, also called Bhimnagar Barrage, was built between 1959 and 1963 and straddles the Indo- Nepal broder.It is irrigation,flood control and hydropower generation project on the Koshi River built under a bilateral agreement between Nepal and India. The catchment area of the river is 61,788 km square in Nepal at the barrage site. The highest peaks lie in its catchment. the eastern canal and the western canal taking off from the barrage, were designed for a discharge capacity of 455 cubic metres per second to irrigate 6,125 square kilometres and 210 cubic metres per second to irrigate 3,566.1 square kilometres respectively hydropower plant has been built on the eastern canal, at a canal drop, to generate 20 NW. The western koshi canal provides irrigation in Nepal. A valuable bridge over the barrage opened up the East-West highway in the eastern sector of Nepal. TheKoshi River is known as the sorrow of Bihar as the annual floods about 21,000 km square of fertile agricultural lands thereby disturbing the rural economy.koshi river flooded most of the districts of Bihar like Supaul, Araria, Saharsa, Madhepura etc.Koshi barrage was constructed for raise the water level in the barrage sufficiently because flattening the slope of the river during flood, to create such pond level as to enable flow irrigation through the eastern and western main canal taking off from both end of barrage for which canal head regulators were constructed, to generate hydro –electric power. Earlier Koshi River brought flood to the state of Bihar especially in the north eastern area during the monsoon .