Saturday, February 28, 2009

Kosi embankment system (4&5)

The Kosi barrage with earth dams across river, afflux bunds and embankments above and below the river confines the river to flow within embankments. Embankments on both sides downstream of the barrage with a length of 246 km (153 mi) has been constructed to check the westward movement of the river. The embankments have been kept wide apart, about 12 to 16 km (9.9 mi), to serve as a silt trap

Sapta Kosi High Multipurpose Project (Indo-Nepal)

Government of India (GOI) and His Majesty's Government of Nepal (HMGN), have agreed to conduct joint investigations and other studies for the preparation of Detailed Project Report (DPR) of Sapta Kosi High Dam Multipurpose Project and Sun Kosi Storage-cum-Diversion Scheme to meet the objectives of both the countries for Development of a) hydropower generation, b) irrigation, c) flood control/management and d) navigation.
A 269-metre (880 ft) high concrete/Rock fill dam on the Sapta Koshi River with a dam toe underground power house with an installed capacity of 3000 MW at 50% load factor, a barrage on river Sapta Kosi about 8 km (5.0 mi) downstream of Sapta Kosi High Dam to re-regulate the water being released from the Sapta Koshi dam with two canals, Eastern Chhatra Canal and Western Chhatra Canal, off-taking from the either bank from barrage site to provide water for irrigation both in Nepal and India and Navigation through Koshi up to Kursela and also in the reservoir of Sapta Koshi dam are envisaged.
A Power Canal off-taking from the Eastern Chatra Canal is proposed for conveying the water required for irrigation at existing Kosi barrage at Hanuman Nagar and also the water which may be required downstream of Hanuman Nagar Barrage for the purpose of navigation. To utilize the head available between Chatra and Hanuman Nagar barrages for power generation, three canal Power Houses, each of 100 MW installed capacity are also proposed on power canal.
Necessary cushion in storage capacity of Sapta Kosi High Dam would be provided to moderate the flood downstream of dam.
Chatra Canal System would provide irrigation to large areas in Nepal and India (particularly in Bihar).
A Joint Project Office (JPO) has been set up in Nepal for investigation of the project.


Nepal has a total estimated potential of 83,290 MW out of which economically exploitable potential is 42,140 MW. The Koshi river basin contributes 22,350 MW of this potential.(360 MW from small schemes and 1875 MW from major schemes) and the economically exploitable potential is assessd as 10,860 MW (includes the Sapta Koshi Multipurpose Project [3300MW] mentioned above).

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