The Saptakoshi Barrage is a flood control sluice across the Saptakoshi River in Nepal, near the Nepal–Indian border. It was built between 1958 and 1962. The Saptakoshi has seven major tributaries: Sun Kosi (Nepali: सुनकोशी), Tamakoshi (तामाकोशी), Dudh Koshi (दुधकोशी), Indravati (इन्द्रावती), Likhu (लिखू), Arun (अरुण) and Tamur (तमोर). Its total length is over 2.5km.
Saptakoshi Barrage, also called Bhimnagar Barrage. It is an irrigation, flood control and hydropower generation project on the shaptakoshi river built under a bilateral agreement between Nepal and India. The catchment area of the river is 61,788 km2 (23,856 sq mi) in Nepal at the Barrage site. The highest peaks – the Mount Everest and the Mount Kanchenjunga — lie in its catchment. About 10% of this catchment is snow-fed. The Eastern Canal and the Western Canal taking off from the barrage have been designed for a discharge capacity of 455 cubic metres per second (16,100 cu ft/s) to irrigate 6,125 square kilometres (1,514,000 acres) and 210 cubic metres per second (7,400 cu ft/s) to irrigate 3,566.1 square kilometres (881,200 acres) respectively. A hydropower plant has been built on the Eastern Canal, at a canal drop (3.6 km (2.2 mi) from the Koshi Barrage), to generate 20 MW. The Western Kosi Canal provides irrigation to 250 square kilometres (62,000 acres) in Nepal. A valuable bridge over the barrage opened up the East-West highway in the eastern sector of Nepal
An inundation canal taking off at Chatara, where the Saptakoshi debouches into the plains, has been built to irrigate a gross area of 860 km² in Nepal. The project has been renovated with IDA assistance after Nepal took over the project in 1976. -WiKi-