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			{{Short description\|Tributary of the Brahmaputra River in Bhutan, India, and Bangladesh}}
	{{Infobox river		{{Infobox river
	\| name = Raidāk River/Wang Chhu		\| name = Raidāk River/Wang Chhu
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	}}		}}

	The '''Raidāk River''' (रायडेक नदी), also called '''Wang Chhu''' or '''Wong Chhu''' in Bhutan, is a tributary of the [[River Brahmaputra]], and a [[trans-boundary river]]. It flows through Bhutan, India and Bangladesh. It is one if the main river in [[Alipurduar district\|Alipurduar District]], [[India]].		The '''Raidāk River''' ({{lang-hi\|रायडेक नदी}}), also called '''Wang Chhu''' or '''Wong Chhu''' in [[Bhutan]], is a tributary of the [[River Brahmaputra]], and a [[trans-boundary river]]. It flows through Bhutan, India and Bangladesh. It is one of the main river in [[Alipurduar district\|Alipurduar District]], India.

	==Course==		==Course==
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	===West Bengal and Bangladesh===		===West Bengal and Bangladesh===
	[[File:BD Map Rivers of North Bengal2.jpg\|thumb\|left\|Map of rivers of West Bengal]]		[[File:BD Map Rivers of North Bengal2.jpg\|thumb\|left\|Map of rivers of West Bengal]]
	If debouches into the plains in [[Jalpaiguri district\|Alipurduar District]] ( [[Uttar Kamakhyaguri\|Kamakhyaguri]] ) 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]],<ref>{{cite book\|url = https://books.google.com/books?id=ZKs1gBhJSWIC&q=raidak+river&pg=PA428 \| title = Hydrology and Water Resources of India \| work = p. 428 \|author1=Sharad K. Jain \|author2=Pushpendra K. Agarwal \|author3=Vijay P. Singh \| date = 16 May 2007 \| isbn = 9781402051807 \|access-date = 2010-05-09 }}</ref><ref>{{cite web\|url =http://jalpaiguri.gov.in/ \| title = Jalpaiguri district\|publisher =Jalpaiguri district administration \|access-date = 2010-05-09 }}</ref><ref>{{cite web\|url =http://coochbehar.gov.in/ \| title =Cooch Behar district \|publisher = Cooch Behar district administration \|access-date = 2010-05-09 }}</ref><ref>{{cite book\|url = https://books.google.com/books?id=ugFIz7ph-kEC&q=Kurigram+Raidak&pg=PA112 \| title = Discovering Himalaya, Volume 2 \| work = p 112 \| first = K.S. \| last = Gulia \| year = 2007 \| isbn = 9788182054103 \|access-date = 2010-05-09 }}</ref> where it is sometimes referred to Dudhkumar River.<ref>{{cite web\|url = http://bpedia.org/D_0297.php \| title = Dudhkumar River\|publisher = Banglapedia \|access-date = 2010-05-09 }}</ref>		It debouches into the plains in [[Jalpaiguri district\|Alipurduar District]] ( [[Uttar Kamakhyaguri\|Kamakhyaguri]] ) 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]],<ref>{{cite book\|url = https://books.google.com/books?id=ZKs1gBhJSWIC&q=raidak+river&pg=PA428 \| title = Hydrology and Water Resources of India \| work = p. 428 \|author1=Sharad K. Jain \|author2=Pushpendra K. Agarwal \|author3=Vijay P. Singh \| date = 16 May 2007 \| isbn = 9781402051807 \|access-date = 2010-05-09 }}</ref><ref>{{cite web\|url =http://jalpaiguri.gov.in/ \| title = Jalpaiguri district\|publisher =Jalpaiguri district administration \|access-date = 2010-05-09 }}</ref><ref>{{cite web\|url =http://coochbehar.gov.in/ \| title =Cooch Behar district \|publisher = Cooch Behar district administration \|access-date = 2010-05-09 }}</ref><ref>{{cite book\|url = https://books.google.com/books?id=ugFIz7ph-kEC&q=Kurigram+Raidak&pg=PA112 \| title = Discovering Himalaya, Volume 2 \| work = p 112 \| first = K.S. \| last = Gulia \| year = 2007 \| isbn = 9788182054103 \|access-date = 2010-05-09 }}</ref> where it is sometimes referred to Dudhkumar River.<ref>{{cite web\|url = http://bpedia.org/D_0297.php \| title = Dudhkumar River\|publisher = Banglapedia \|access-date = 2010-05-09 }}</ref>

	The total length of the main river is {{convert\|370\|km}} but along with its tributaries, it covers a length of nearly {{convert\|610\|km}} in Bhutan alone.<ref name=fao/><ref>{{cite web\|url = http://countrystudies.us/bhutan/16.htm \| title = River Systems \|access-date = 2010-05-09 }}</ref>		The total length of the main river is {{convert\|370\|km}} but along with its tributaries, it covers a length of nearly {{convert\|610\|km}} in Bhutan alone.<ref name=fao/><ref>{{cite web\|url = http://countrystudies.us/bhutan/16.htm \| title = River Systems \|access-date = 2010-05-09 }}</ref>

imported>Dibakar55 at 14:36, 30 April 2021

2021-04-30T14:36:29Z

New page

{{Infobox river
| name = Raidāk River/Wang Chhu
| image =
| image_size =
| image_caption =
| map =Raidak River map.png
| map_size = 220px
| map_caption =Relief map showing the passage of the Raidak River into the larger Brahmaputra
| source1_location =
| mouth_location = [[Brahmaputra River]]
| subdivision_type1 = Country
| subdivision_name1 = [[Bhutan]], [[India]], [[Bangladesh]]
| progression = [[Thimphu]], [[Rinpung Dzong]], Chukha hydel project, Tala hydel project, [[Tufanganj]]
| length = {{convert|370|km|mi}}
| source1_elevation =
| mouth_elevation =
| discharge1_avg =
| basin_size =
| river_system =
| tributaries_left =
| tributaries_right =
}}

The '''Raidāk River''' (रायडेक नदी), also called '''Wang Chhu''' or '''Wong Chhu''' in Bhutan, is a tributary of the [[River Brahmaputra]], and a [[trans-boundary river]]. It flows through Bhutan, India and Bangladesh. It is one if the main river in [[Alipurduar district|Alipurduar District]], [[India]].

==Course==
[[File:Raidak_catchment.jpg|thumb|left|Catchment area boundary]]

===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 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 {{convert|2121|m}} above sea level and at the point of its exit in the [[Dooars]] its elevation is only {{convert|90|m}}.<ref name=fao>{{cite web|url =http://www.fao.org/docrep/field/003/L8853E/L8853E02.htm | title = Physiological Survey | work =River System of Bhutan |publisher = FAO Corporate Document Repository |access-date = 2010-05-09 }}</ref><ref>{{cite web|url = http://www.magical-nepal.com/bhutan_geography.htm | title = Geography |access-date = 2010-05-09 }}</ref>

===West Bengal and Bangladesh===
[[File:BD Map Rivers of North Bengal2.jpg|thumb|left|Map of rivers of West Bengal]]
If debouches into the plains in [[Jalpaiguri district|Alipurduar District]] ( [[Uttar Kamakhyaguri|Kamakhyaguri]] ) 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]],<ref>{{cite book|url = https://books.google.com/books?id=ZKs1gBhJSWIC&q=raidak+river&pg=PA428 | title = Hydrology and Water Resources of India | work = p. 428 |author1=Sharad K. Jain |author2=Pushpendra K. Agarwal |author3=Vijay P. Singh | date = 16 May 2007 | isbn = 9781402051807 |access-date = 2010-05-09 }}</ref><ref>{{cite web|url =http://jalpaiguri.gov.in/ | title = Jalpaiguri district|publisher =Jalpaiguri district administration |access-date = 2010-05-09 }}</ref><ref>{{cite web|url =http://coochbehar.gov.in/ | title =Cooch Behar district |publisher = Cooch Behar district administration |access-date = 2010-05-09 }}</ref><ref>{{cite book|url = https://books.google.com/books?id=ugFIz7ph-kEC&q=Kurigram+Raidak&pg=PA112 | title = Discovering Himalaya, Volume 2 | work = p 112 | first = K.S. | last = Gulia | year = 2007 | isbn = 9788182054103 |access-date = 2010-05-09 }}</ref> where it is sometimes referred to Dudhkumar River.<ref>{{cite web|url = http://bpedia.org/D_0297.php | title = Dudhkumar River|publisher = Banglapedia |access-date = 2010-05-09 }}</ref>

The total length of the main river is {{convert|370|km}} but along with its tributaries, it covers a length of nearly {{convert|610|km}} in Bhutan alone.<ref name=fao/><ref>{{cite web|url = http://countrystudies.us/bhutan/16.htm | title = River Systems |access-date = 2010-05-09 }}</ref>

==Chukha hydel plant==
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 {{convert|40|m}} diversion dam was built at Chimakoti village, {{convert|1.6|km}} upstream of the confluence of the Ti Chhu and Wong Chhu rivers. From the dam water was diverted through {{convert|6.5|km|mi|adj=on}} long tunnels to a fall of more than {{convert|300|m}} to Chukha power house for generation of electricity. Construction started in 1974 and completed in 1986–88.<ref>{{cite web |url = http://www.history.com/topics/bhutan |title = Bhutan |access-date = 2010-05-09 |url-status = dead |archive-url = https://web.archive.org/web/20100307184420/http://www.history.com/topics/bhutan |archive-date = 2010-03-07 }}</ref><ref>{{cite web|url =http://krsivam.blogspot.com/2009/04/chukha-hydel-project.html | title = Chukha Hydel Project |access-date = 2010-05-09 }}</ref><ref>{{cite web|url = http://www.queensjdiexec.org/publications/qed_dp_82.pdf | title = International Trade in Energy|access-date = 2010-05-09 }}</ref><ref>{{cite web|url =http://www.industcards.com/hydro-asia-south.htm | title =Hydroelectric Power Plants in South Asia |access-date = 2010-05-09 |archive-url=http://arquivo.pt/wayback/20090718111257/http://www.industcards.com/hydro%2Dasia%2Dsouth.htm |archive-date=2009-07-18}}</ref><ref>{{cite book|url =https://books.google.com/books?id=XWblUfYqGK4C&q=Wong+chhu+hydel+second&pg=PA33 | title =International Encyclopaedia Of Himalayas (5 Vols. Set)| work = p. 33 |first = Ramesh Chandra | last = Bisht | date =January 2008| isbn =9788183242653|access-date = 2010-05-09 }}</ref>

==Tala hydroelectric plant==
{{main|Tala Hydroelectric Power Station}}

[[Tala Hydroelectric Power Station]] is a [[run-of-the-river]] type [[hydroelectric]] [[power station]] on the Wangchu River in [[Chukha District]], [[Bhutan]]. The station consists of a {{Convert|92|m|adj=on}} tall [[gravity dam]] which diverts water through a {{Convert|22|km|abbr=on}} long [[Water wheel#Headrace, tailrace|headrace]] tunnel to the power station, which contains six {{convert|170|MW}} [[Pelton turbine]]-generators. The Tala dam is located about 3 km downstream of Chukha power house.

==References==
{{Reflist}}
{{Clear}}

{{Hydrography of Bhutan}}
{{Rivers in and around Bengal}}

{{coord|26.112|89.706|display=title}}

{{DEFAULTSORT:Raidak River}}
[[Category:Rivers of Bhutan]]
[[Category:Rivers of West Bengal]]
[[Category:Tributaries of the Brahmaputra River]]
[[Category:International rivers of Asia]]
[[Category:Rivers of Bangladesh]]
[[Category:Rivers of India]]
[[Category:Rivers of Rangpur Division]]

Raidāk River - Revision history

115.187.53.83: robot: Update article (please report if you notice any mistake or error in this edit)

imported>Dibakar55 at 14:36, 30 April 2021