Editing Ganges (section)

==Irrigation==
The Ganges and its all tributaries, especially the Yamuna, have been used for irrigation since ancient times.{{sfn|Singh|2005|pp=69–79}}<ref>{{Cite news|url=https://archive.thedailystar.net/2005/04/14/d5041401065.htm|title=Water board to carry out inflated project|date=14 April 2005}}</ref><ref>{{Cite news|url=https://en.barta24.com/details/national-en/187841/farmers-are-disoriented-due-to-lack-of-water|title=GK projects' irrigation pumps shut; farmers are disoriented due to lack of water|date=21 September 2023}}</ref> Dams and canals were common in the Gangetic plain by the 4th century BCE.{{sfn|Hill|2008}} The Ganges-Brahmaputra-Meghna basin has a huge [[Hydroelectricity|hydroelectric]] potential, on the order of 200,000 to 250,000 megawatts, nearly half of which could easily be harnessed. As of 1999, India tapped about 12% of the hydroelectric potential of the Ganges and just 1% of the vast potential of the Brahmaputra.{{sfn|Elhance|1999|p=163}}

===Canals===
[[File:Headworks ganges canal haridwar1860.jpg|thumb|Head works of the Ganges canal in Haridwar (1860). Photograph by [[Samuel Bourne]].]]
Megasthenes, a Greek ethnographer who visited India during the 3rd century BCE when Mauryans ruled India described the existence of canals in the Gangetic plain. Kautilya (also known as [[Chanakya]]), an advisor to [[Chandragupta Maurya]], the founder of [[Maurya Empire]], included the destruction of dams and levees as a strategy during the war.{{sfn|Hill|2008}} [[Firuz Shah Tughlaq]] had many canals built, the longest of which, {{convert|240|km|mi|abbr=on}}, was built in 1356 on the Yamuna River. Now known as the Western Yamuna Canal, it has fallen into disrepair and been restored several times. The [[Mughal emperors|Mughal emperor]] [[Shah Jahan]] built an irrigation canal on the Yamuna River in the early 17th century. It fell into disuse until 1830, when it was reopened as the Eastern Yamuna Canal, under British control. The reopened canal became a model for the Upper Ganges Canal and all following canal projects.{{sfn|Singh|2005|pp=69–79}}
[[File:GangesCanal2.jpg|thumb|The Ganges Canal highlighted in red stretching between its headworks off the Ganges River in Haridwar and its confluences with the Jumna (Yamuna) River in [[Etawah]] and with the Ganges in [[Cawnpore]] (now Kanpur).]]
The first British canal in India (which did not have Indian antecedents) was the [[Ganges Canal]] built between 1842 and 1854.<ref name="stone2002-p16">{{Harvnb|Stone|2002|p=16}}</ref>
Contemplated first by Col. [[John Russell Colvin]] in 1836, it did not at first elicit much enthusiasm from its eventual architect Sir [[Proby Thomas Cautley]], who balked at the idea of cutting a canal through extensive low-lying land to reach the drier upland destination. However, after the [[Agra famine of 1837–38]], during which the [[East India Company]]'s administration spent [[Rs.]] 2,300,000 on famine relief, the idea of a canal became more attractive to the company's budget-conscious Court of Directors. In 1839, the [[Governor General of India]], [[George Eden, 1st Earl of Auckland|Lord Auckland]], with the Court's assent, granted funds to Cautley for a full survey of the swath of land that underlay and fringed the projected course of the canal. The Court of Directors, moreover, considerably enlarged the scope of the projected canal, which, in consequence of the severity and geographical extent of the famine, they now deemed to be the entire [[Doab]] region.<ref>{{Cite book|url=https://books.google.com/books?id=_ce8FpJzR-4C&pg=PA103|title=Uttar Pradesh General Knowledge|first=C. L.|last=Khanna|date=1 September 2010|publisher=Upkar Prakashan|isbn=9788174824080}}</ref>

The enthusiasm, however, proved to be short-lived. Auckland's successor as Governor-General, [[Edward Law, 1st Earl of Ellenborough|Lord Ellenborough]], appeared less receptive to large-scale public works, and for the duration of his tenure, withheld major funds for the project. Only in 1844, when a new Governor-General, [[Henry Hardinge, 1st Viscount Hardinge|Lord Hardinge]], was appointed, did official enthusiasm and funds return to the Ganges canal project. Although the intervening impasse had seemingly affected Cautley's health and required him to return to Britain in 1845 for recuperation, his European sojourn gave him an opportunity to study contemporary hydraulic works in the United Kingdom and Italy. By the time of his return to India even more supportive men were at the helm, both in the [[North-Western Provinces]], with [[James Thomason (British colonial governor)|James Thomason]] as Lt. Governor, and in [[British India]] with [[James Broun-Ramsay, 1st Marquess of Dalhousie|Lord Dalhousie]] as Governor-General. Canal construction, under Cautley's supervision, now went into full swing. A {{convert|350|mi|km|abbr=on|order=flip}} long canal, with another {{convert|300|mi|km|order=flip|abbr=on}} of branch lines, eventually stretched between the headworks in Haridwar, splitting into two branches below [[Aligarh]], and its two confluences with the Yamuna (Jumna in map) [[Mainstem (hydrology)|mainstem]] in [[Etawah]] and the Ganges in Kanpur (Cawnpore in map). The Ganges Canal, which required a total capital outlay of £2.15&nbsp;million, was officially opened in 1854 by Lord Dalhousie.{{sfn|Prakash|1999|p=162}} According to historian Ian Stone: <blockquote>It was the largest canal ever attempted in the world, five times greater in its length than all the main irrigation lines of [[Lombardy]] and Egypt put together, and longer by a third than even the largest USA navigation canal, the [[Pennsylvania Canal]].</blockquote>

===Dams and barrages===
A major [[Barrage (dam)|barrage]] at Farakka was opened on 21 April 1975,{{sfn|Brichieri-Colombi|Bradnock|2003}} It is located close to the point where the main flow of the river enters Bangladesh, and the tributary Hooghly (also known as Bhagirathi) continues in West Bengal past
Kolkata. This barrage, which feeds the Hooghly branch of the river by a {{convert|26|mi|km|adj=on|order=flip|abbr=on}} long feeder canal, and its water flow management has been a long-lingering source of dispute with Bangladesh.<ref>{{cite journal | title=The Ganges Water Dispute: An Appraisal of a Third Party Settlement| author=M. Rafiqul Islam| journal=Asian Survey| year=1987| volume=27 | issue = 8| pages=918–34| doi=10.2307/2644864| jstor=2644864}}</ref> [[Sharing the water of the Ganges|Indo-Bangladesh Ganges Water Treaty]] signed in December 1996 addressed some of the water sharing issues between India and Bangladesh.{{sfn|Brichieri-Colombi|Bradnock|2003}} There is [[Lav Khush Barrage]] across the River Ganges in Kanpur.

[[Tehri Dam]] was constructed on [[Bhagirathi]] River, a tributary of the Ganges. It is located 1.5&nbsp;km downstream of Ganesh Prayag, the place where Bhilangana meets Bhagirathi. Bhagirathi is called the Ganges after Devprayag.{{sfn|Sharma|Bahuguna|Chauhan|2008}} Construction of the dam in an earthquake-prone area{{sfn|Brune|1993}} was controversial.<ref>{{cite journal| title=The dam that should not be built| author1=Fred Pearce| author2=Rob Butler| journal=New Scientist| date=26 January 1991| url=https://www.newscientist.com/article/mg12917534.600--the-dam-that-should-not-be-built-india-is-building-the-largest-dam-in-asia-in-a-valley-beset-by-earthquakes-and-landslips-seismologists-say-the-site-is-too-dangerous-but-engineers-are-using-discredited-data-to-push-ahead-with-construction--.html| access-date=28 August 2017| archive-date=22 October 2014| archive-url=https://web.archive.org/web/20141022182636/http://www.newscientist.com/article/mg12917534.600--the-dam-that-should-not-be-built-india-is-building-the-largest-dam-in-asia-in-a-valley-beset-by-earthquakes-and-landslips-seismologists-say-the-site-is-too-dangerous-but-engineers-are-using-discredited-data-to-push-ahead-with-construction--.html| url-status=live}}</ref>

[[Bansagar Dam]] was built on the [[Sone River]], a tributary of the Ganges for both irrigation and [[hydroelectric]] power generation.<ref>{{cite web |url=http://mowr.gov.in/writereaddata/linkimages/anu228556756739.pdf |title=Bansagar Dam project |access-date=27 April 2011 |publisher=Government of India Ministry of Water Sources |url-status=dead |archive-url= https://web.archive.org/web/20111008223133/http://mowr.gov.in/writereaddata/linkimages/anu228556756739.pdf |archive-date=8 October 2011}}</ref> Ganges floodwaters along with Brahmaputra waters can be supplied to most of its right side basin area along with central and south India by constructing a [[coastal reservoir]] to store water on the Bay of Bengal sea area.<ref>{{Cite journal |last=Sasidhar |first=Nallapaneni |date=May 2023 |title=Multipurpose Freshwater Coastal Reservoirs and Their Role in Mitigating Climate Change |url=https://www.ijee.latticescipub.com/wp-content/uploads/papers/v3i1/A1842053123.pdf |access-date=15 August 2023 |journal=Indian Journal of Environment Engineering |issn=2582-9289 |volume=3 |issue=1 |pages=31–46 |doi=10.54105/ijee.A1842.053123 |s2cid=258753397 |archive-date=11 June 2023 |archive-url=https://web.archive.org/web/20230611114313/https://www.ijee.latticescipub.com/wp-content/uploads/papers/v3i1/A1842053123.pdf |url-status=live }}</ref>