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|Carries||Motor vehicles, pedestrians and bicycles|
|Locale||Sunsari and Saptari district, Nepal|
|Official name||koshi barrage|
|Design||Supreme and Company Limited, Kolkata, India|
|Total length||1,150 m (3,773.0 ft)|
|Width||10 m (32.8 ft)|
The Koshi Barrage is a sluice across the Koshi river that carries vehicular, bicycle, and pedestrian traffic between Saptari district and Sunsari district of Nepal. It is near the international border with India. It was built between 1958 and 1962 and has 56 gates. It was constructed after the Koshi Agreement was signed between the Government of Nepal and India on April 25, 1954. The barrage was designed and built by Joseph and Company Limited, India. The Koshi Tappu Wildlife Reserve is roughly 3–4 miles north of the barrage.
Due to this barrage, every year several areas of Terai are affected due to the flood and blockage of this barrage. This affects mostly the Koshi region of Bihar (Supaul, Saharsa, Madhepura and Purnia). The Kosi River is known as the "Sorrow of Bihar" as the annual floods affect about 21,000 km2 (8,100 sq mi) of fertile agricultural lands thereby disturbing the rural economy. The Koshi has an average water flow (discharge) of 2,166 m3/s (76,500 cu ft/s).
In August 2008, the eastern embankments of the Koshi Barrage collapsed, several miles north of the Nepal-India border. The resulting flood wiped out miles of fertile farmland in Nepal, covering it with a thick layer of river sand, and affected 53,800 Nepalese. It left 3 million people homeless in Bihar, India.
- "Koshi Barrack over the largest river of Nepal". Boss Nepal. Retrieved 29 May 2018.
- "Sorrow of Bihar". egov.eletsonline.com. Retrieved 29 May 2018.
- "Koshi Agreement between India and Nepal" (PDF). Indian Embassy, Nepal. Retrieved 29 May 2018.
- "'Sorrow of Bihar' River Kosi: An overview". 4 August 2014. Retrieved 29 May 2018.
- Adhikary, Dhruba (5 September 2008). "For Prachanda, a tale of two cities", Asia Times. Retrieved on 29 September 2008.
|Wikimedia Commons has media related to Koshi Barrage.|
- Sushil Koirala (21 August 2008). "What is Flooding the Koshi Barrage?", eKantipur.com.
- Diversity of Wetland Birds around the Koshi Barrage Area by D. T. Chhetry in Our Nature (2006)4:91-95
- Reed, David; James McConnachie (2002). The Rough Guide to Nepal. Rough Guides. p. 395. ISBN 1-85828-899-1.
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