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 rapid stream, running over a bed of large boulders. Between Thimphu and the confluence with the Paro Chhu, the course of the river is not severely confined but, after leaving the confluence, it runs through a narrow defile between very steep cliffs. It subsequently flows southeast through a comparatively open valley, its course strewn with large boulders against which the water foams violently. It is joined by several small tributaries flowing from nearby mountains. Just above Paro Dzong a considerable 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 above sea level and at the point of its exit in the Dooars its elevation is only.
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 chainage 327 km in Kurigram District in Bangladesh, where it is sometimes referred to Dudhkumar River. The total length of the main river is but along with its tributaries, it covers a length of nearly in Bhutan alone.
The 336MW Chukha hydel project, which harnesses the waters of the Wang Chhu or Raidak River, was historically one of the largest single investments undertaken in Bhutan, and it represented a major step toward exploiting the country's huge hydroelectric potential. It was built by India on a turnkey basis, with India providing 60% of the capital in a grant and 40% in a loan at highly 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. Located between Thimphu and the Indian border, a diversion dam was built at Chimakoti village, upstream of the confluence of the Ti Chhu and Wong Chhu rivers. From the dam water was diverted through long tunnels to a fall of more than to Chukha power house for generation of electricity. Construction started in 1974 and completed in 1986–88.
