Kosi Barrage and Eastern Canal Major Irrigation Project JI02121

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1Irrigation Project Name Kosi Barrage and Eastern Canal Major Irrigation Project
2Irrigation Project Name Alias
3Purpose Irrigation
4Type Major
5Engineering Type Diversion
6Status Completed
7State Bihar
8Districts Benefited Araria,Saharsa,Khagaria,Supaul,Purnia,Madhepura,Katihar
9Basin Ganga
10River Kosi River
11Project Sharing International
12Intercountry Nepal
13Interbasin No
14Work Started in 5 Year Plan I-Plan
15Completed in 5 Year Plan VI-Plan
16Project Approval Status Planning Commission
17Year of Approval by Planning Commission 1952
18Approved Cost (Rs. in cr) 44.94
19Actual Cost (Rs. in cr) 105.95
20Culturable Command Area (CCA) (th ha) 612
21Ultimate Irrigation Potential (UIP) (th ha) 735
22Potential Created (PC) (th ha) 735
23Project Covered under ERM Scheme Yes
24Project Covered under CADA Scheme Yes
25Project Covered under AIBP Scheme No
26Studies Conducted
27Project Covered under Tribal Sub-Plan No
28Project Covered under Drought Prone Area Programme (DPAP)
1Kosi Barrage BiharBarrage/ Weir/ Anicut (BWA)

Brief Description of the Project

Kosi Barrage is situated across river Kosi at Bhimnagar, Sunsari District in Nepal. A 1149 metre long Kosi Barrage has been designed to pass a peak discharge of 27,000 cumecs (9.5 lakh cusecs). The work of Kosi Barrage project was started in the year 1955 and completed in July 1963.

There are 56 Gates including 6 Nos. Under Sluice Gates on the left side and 4 Nos. of Under Sluice Gates on right side of the Barrage. Irrigation Canal taking off from both sides of Kosi Barrage viz. Eastern Kosi Canal and Western Kosi Canal, spreads in the Tarai and Plain areas of Kosi Basin, both in India and Nepal.The running and maintenance of the Kosi barrage rests with Water Resources Deptt., Govt. of Bihar.

The Eastern Kosi Canal annually irrigates an area of 6.12 lakh ha (including 1.17 lakh ha under Rajpur Canal System). The command area is spread in seven districts of Bihar namely Supaul, Saharsa, Madhepura, Purnea, Kathiar, Araria and Khagaria.

Canal System

There are three canal systems in the project:

  1. Chatra Canal system in Nepal
  2. Eastern Kosi canal system in India including Rajpura branch canal
  3. Western Kosi canal system (This is a seperate project)

Eastern Kosi Canal System

It comprises of main canal (43.47 km in length) from which five branch canal and several direct distributaries takes-off. The branch canals are Murliganj, Jankinagar, Purnea, Araria and Rajpura.


The devastating flood of August 2008 in Kosi river breached the right Afflux Bandh at Kusaha (Nepal). The Eastern Kosi Canal system has also been severally damaged, as a result of which the Eastern Kosi Main Canal System has almost become non functional.

To restore the Irrigation potential of this project, the restoration of Eastern Kosi Main Canal & its system has been taken up as ERM project under AIBP. The latest estimated cost of this project is Rs 750.75 crore (2008 Price Level), which has been technically approved by T.A.C of MoWR in its 99th meeting held on 24-08-2009 and the Planning Commission has also accorded investment clearance on 13.10.2009.


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