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Wang Chhu
About Wang Chhu

The Wang Chhu (also called Wong Chhu or Raidak in Bhutan) is a tributary of the Brahmaputra River, and a trans-boundary river which flows through India, Bangladesh and Bhutan. 

Wang Chhu in West Bengal and Bangladesh

It debouches into the plains in Jalpaiguri district and then flows through Cooch Behar district in West Bengal. The Raidak confluences with the Brahmaputra at chain age 327 km in Kurigram District in Bangladesh, where it is sometimes referred to Dudhkumar River.

The total length of the main river is 370 kilometres (230 mi) but along with its tributaries, it covers a length of almost 610 kilometres (380 mi) in Bhutan alone.

Wang Chhu in Bhutan

The Wang Chhu, or Raidāk, rises in the Himalayas. In its upper reaches it is also known as the Thimphu Chhu. The main river is a speedy stream which runs over a bed of large stones. Between Thimphu and the convergence with the Paro Chhu, the course of the river is not harshly confined but, after leaving the convergence, it runs through a narrow defile between very steep cliffs. Then it flows southeast through a fairly open valley, its course spreads with large boulders against which the water bubbles violently. It is joined by some small tributaries flowing from nearby mountains. Just above Paro Dzong a substantial feeder, the Ta Chhu, joins it from the left. To the west, the Ha Chhu drains into the Wong Chhu. At Tashichho Dzong the bed of the river is about 2,121 metres (6,959 ft) above sea level and at the point of its exit in the Dooars its altitude is only 90 metres (300 ft). 

Chukha hydel plant

The 336 MW Chukha hydel project, which links the waters of the Wang Chhu or Raidak River, was historically one of the largest single investments undertaken in Bhutan, and it symbolized a major step toward exploiting the country's vast hydroelectric potential. It was founded by India on a turnkey basis, with India providing 60% of the capital in a grant and 40% in a loan at very concessional terms and conditions. In the arrangement, India receives in turn all the electricity generated from the project in excess of Bhutan’s demand at much cheaper prices than India’s generation cost from alternative sources.

Diversion dam is situated between Thimphu and the Indian border, a 40 metres (130 ft). Diversion dam was founded at Chimakoti village, 1.6 kilometres (0.99 mi) upstream of the convergence of the Ti Chhu and Wong Chhu rivers. Construction started in 1974 and completed in 1986-88.

From the dam water was diverted through 6.5 kilometres (4.0 mi) long channels to a fall of more than 300 metres (980 ft) to Chukha power house for generation of electricity.



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