Wikipedia

South–North Water Transfer Project

(Redirected from Big Western Line)

The South–North Water Transfer Project, also translated as the South-to-North Water Diversion Project,[1] is a multi-decade infrastructure mega-project in China that aims to channel 44.8 cubic kilometers (44.8 billion cubic meters) of fresh water each year[2] from the Yangtze River in southern China to the more arid and industrialized north through three canal systems:[3]

South–North Water Transfer Project
Project logo
Traditional Chinese南水北調工程
Simplified Chinese南水北调工程
Literal meaningSouthern Water Northern Diversion Project
Transcriptions
Standard Mandarin
Hanyu PinyinNánshuǐ Běidiào Gōngchéng
Wade–GilesNan-shui P'ei-tiao Kung-ch'eng

Mao Zedong discussed the idea for a mass engineering project as an answer to China's water problems as early as 1952. He reportedly said, "there's plenty of water in the south, not much water in the north. If at all possible, borrowing some water would be good".[5][6][7] Construction of the project began in 2003.[8]

By 2014, more than $79 billion had been spent, making it one of the most ambitious and expensive engineering projects in human history.[9][better source needed]

East route

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German-language map showing the three routes

The Eastern Route Project (ERP), or Jiangdu Hydro Project, consists of an upgrade to the Grand Canal and will be used to divert a fraction of the total flow of the Yangtze River to northern China. According to local hydrologists, the entire flow of the Yangtze at the point of its discharge into the East China Sea is, on average, 956 km3 per year; the annual flow does not fall below approximately 600 km3 per year, even in the driest years.[10] As the project progresses, the amount of water to be diverted to the north will increase from 8.9 km3/year to 10.6 km3/year to 14.8 km3/year.[10]

Water from the Yangtze River will be drawn into the canal in Jiangdu, where a giant 400 m3/s (12.6 km3/year if operated continuously) pumping station was built in the 1980s. The water will then be pumped by stations along the Grand Canal and through a tunnel under the Yellow River and down an aqueduct to reservoirs near Tianjin. Construction on the Eastern route officially began on 27 December 2002, and water was expected to reach Tianjin by 2013. However, in addition to construction delays, water pollution has affected the viability of the route. Initially, the route was expected to provide water for the provinces of Shandong, Jiangsu, and Hebei, with trial operations to begin in mid-2013. Water started arriving in Shandong in 2014, and it is expected one cubic kilometer of water will have been transferred in 2018.[11]

As of October 2017, water had reached Tianjin. Tianjin is expected to receive 1 km3/year.[12] The Eastern route is not expected to supply Beijing, which is to be supplied by the central route.[13]

The completed line will be slightly over 1,152 km (716 miles) long, equipped with 23 pumping stations with a power capacity of 454 megawatts.[14]

An important element of the Eastern Route will be a tunnel crossing under the Yellow River, on the border of Dongping and Dong'e counties of Shandong Province. The crossing will consist of two 9.3 m diameter horizontal tunnels, positioned 70 m under the bed of the Yellow River.[14][10]

Due to the topography of the Yangtze Plain and the North China Plain, pumping stations will be needed to raise water from the Yangtze to the Yellow River crossing; farther north, the water will be flowing downhill in an aqueduct.[10]

Central route

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In Zhuozhou, close to entering Beijing

The central route, known colloquially as the Grand Aqueduct, runs from Danjiangkou Reservoir on the Han River, a tributary of the Yangtze, to Beijing. This project involved raising the height of the Danjiangkou Dam by increasing the dam's crest elevation from 162 m to 176.6 m above sea level. This addition to the dam's height allows the water level in the reservoir to rise from 157 m to 170 m above sea level and thus permits the flow into the water diversion canal to begin downhill, pulled by gravity into the lower elevation of the canals.[15]

The central route crosses the North China Plain. The canal was constructed to create a continuous downhill flow all the way from the Danjiangkou Reservoir to Beijing without the need for pumping stations.[15] The greatest engineering challenge of the route was building two tunnels under the Yellow River to carry the canal's flow. Construction on the central route began in 2004. In 2008, the 307 km-long northern stretch of the central route was completed at a cost of $2 billion. Water in that stretch of the canal does not come from the Han River but from reservoirs in Hebei Province, south of Beijing. Farmers and industries in Hebei had to cut back on water consumption to allow for water to be transferred to Beijing.[16]

On mapping services, one can see the canal's intake at the Danjiangkou Reservoir (32°40′26″N 111°42′32″E / 32.67389°N 111.70889°E / 32.67389; 111.70889); its crossing of the Baihe River north of Nanyang, Henan (33°6′41″N 112°37′30″E / 33.11139°N 112.62500°E / 33.11139; 112.62500); the Shahe River in Lushan County (33°42′49″N 112°56′40″E / 33.71361°N 112.94444°E / 33.71361; 112.94444); the Ying River in Yuzhou (34°11′05″N 113°26′18″E / 34.18472°N 113.43833°E / 34.18472; 113.43833); and the Yellow River northeast of Zhengzhou (34°52′55″N 113°13′14″E / 34.88194°N 113.22056°E / 34.88194; 113.22056); as well as its entrance into the southwestern suburbs of Beijing at the Juma River in Zhuozhou, Hebei (39°30′26.3″N 115°47′30.2″E / 39.507306°N 115.791722°E / 39.507306; 115.791722).

The whole project was expected to be completed around 2010. Final completion was on 12 December 2014, to allow for more environmental protection along the route. One problem was the impact of the project on the Han River below the Danjiangkou Dam,[5] from which approximately one-third of the route's total water is diverted. One long-term solution being considered is to build another canal to divert water from the reservoir at the Three Gorges Dam to Danjiangkou Reservoir.[17] Construction of this project, named the Yinjiangbuhan tunnel, was announced in July 2022. It is set to take an estimated ten years to complete.[18]

Another major challenge was the resettlement of around 330,000 people who lived near Danjiangkou Reservoir at its former lower elevation and along the route of the project. On 18 October 2009, Chinese officials began to relocate residents from the areas of Hubei and Henan provinces that would be affected by the project.[19] The completed route of the Grand Aqueduct is about 1,264 km long and initially provided 9.5 km3 of water annually. By 2030, the project is slated to increase this transfer to 12–13 km3 per year.[14] Although the transfer will be lower in dry years, it is projected that it will be able to provide a flow of at least 6.2 km3/year at all times with 95% confidence.[15]

Industries are prohibited from locating on the reservoir's watershed to keep its water drinkable.[20]

 
South–North Water Transfer Project Central route starting point in Xichuan County, Nanyang, Henan

West route

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There are long-standing plans to divert about 200 cubic kilometers of water per year from the upstream sections of six rivers in southwestern China, including the Mekong (Lancang River), the Yarlung Zangbo (called Brahmaputra further downstream), and the Salween (Nu River), to the Yangtze River, the Yellow River, and ultimately to the dry areas of northern China through a system of reservoirs, tunnels, and natural rivers.[21]

Financing

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In 2008, construction costs for the eastern and central routes was estimated to be 254.6 billion yuan ($37.44 billion). The government had budgeted only 53.87 billion yuan ($7.9 billion), less than a quarter of the total cost, at that time. This included 26 billion from the central government and special accounts, 8 billion from local governments, and almost 20 billion in loans. As of 2008, around 30 billion yuan had been spent on the construction of the eastern (5.66 billion yuan) and central routes (24.82 billion yuan). Costs of the projects have increased significantly.[14]

Project controversy

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The project required resettling at least 330,000 people in central China.[22] Critics have warned the water diversion will cause environmental damage, and some villagers said officials had forced them to sign agreements to relocate.[22]

In 2013, Radio Free Asia reported that fish farmers on Dongping Lake, on the project's eastern route, in Shandong, claimed that the polluted Yangtze River water entering the lake was killing their fish.[23] Subsequent scientific research showed that the water diversion improved the water environment of Dongping Lake.[24][25]

Scientists have been concerned that the project will increase water evaporation loss. The exact amount of evaporation loss is not known, but it may be improved in the future as more water is transferred and the flow rate increases.[26]

See also

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References

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  1. ^ This is the English translation preferred by the official web site, http://www.nsbd.gov.cn/zx/english/ Archived 25 June 2013 at the Wayback Machine
  2. ^ "{title}" 南水北调工程. Xinhua Net (in Chinese). 27 December 2002. Archived from the original on 7 March 2014. Retrieved 9 March 2014.
  3. ^ Wang, Yue (20 February 2014). "Chinese Minister Speaks Out Against South-North Water Diversion Project". Forbes Asia. Archived from the original on 9 March 2014. Retrieved 9 March 2014.
  4. ^ Jaffe, Aaron; Keith Schneider (1 March 2011). "A Dry and Anxious North Awaits China's Giant, Unproven Water Transport Scheme". Circle of Blue. Archived from the original on 7 March 2014. Retrieved 9 March 2014.
  5. ^ a b Wong, Edward (1 June 2011), "Plan for China's Water Crisis Spurs Concern", The New York Times, archived from the original on 29 September 2015, retrieved 23 February 2017
  6. ^ The quote is given as "南方水多, 北方水少, 如有可能, 借一点也是可以的" in 作家作品: 毛泽东与南水北调 Archived 20 January 2013 at the Wayback Machine (Mao Zedong and the South-to-North Water Diversion Project), by Jin HUaichun (靳怀堾), at the project's official web site.
  7. ^ Zhang Hongzhou, Genevieve Donnellon-May (12 August 2021). "To Build or Not to Build: Western Route of China's South-North Water Diversion Project". China Environment Forum New Security Beat. Wilson Center. Retrieved 14 September 2021.
  8. ^ "South-to-North Water Diversion Project – Water Technology".
  9. ^ Chang, Gordon G. (8 January 2014). "China's Water Crisis Made Worse by Policy Failures". World Affairs. Archived from the original on 1 February 2014. Retrieved 23 November 2018.{{cite news}}: CS1 maint: unfit URL (link)
  10. ^ a b c d Eastern Route Project (ERP) Archived 28 June 2015 at the Wayback Machine, on the official project site; includes the map. (As one can see from the context, "956 million m³" on that page is apparently a typo for "956 billion m³").
  11. ^ 段亚英 (29 March 2018). "Diversion project's eastern route transfers 2.5 bln cubic meters of water". China.org.cn. Retrieved 20 August 2022.
  12. ^ "Desalination: Costly drops". The Economist. 9 February 2013. Archived from the original on 11 February 2013. Retrieved 12 February 2013.
  13. ^ Barnett, Jon; Rogers, Sarah; Webber, Michael; Finlayson, Brian; Wang, Mark (November 2015). "Sustainability: Transfer project cannot meet China's water needs". Nature. 527 (7578): 295–297. Bibcode:2015Natur.527..295B. doi:10.1038/527295a. PMID 26581275. S2CID 4384163.
  14. ^ a b c d South-to-North Water Diversion Project, China Archived 12 July 2007 at the Wayback Machine, Water-Technology.net, September 2008. Also archived here [1]
  15. ^ a b c Middle Route Project (MRP) Archived 30 October 2013 at the Wayback Machine, at the project's official site
  16. ^ China's water-diversion scheme: A shortage of capital flows Archived 13 October 2008 at the Wayback Machine, The Economist, 11 October 2008, p. 61
  17. ^ "World's Largest River Diversion Project Now Pipes Water to Beijing". Bloomberg News. 15 December 2014. Archived from the original on 4 March 2016. Retrieved 11 March 2017.
  18. ^ "China's new mega tunnel will send water from the Three Gorges Dam to Beijing". scmp.com. 26 July 2022. Retrieved 5 October 2024.
  19. ^ The Inquirer, Philadelphia: China to resettle 330,000 people Archived 21 October 2009 at the Wayback Machine, 19 October 2010
  20. ^ Al Jazeera English: China plans for future supply of clean water Archived 7 April 2017 at the Wayback Machine, 11 August 08
  21. ^ Craig Simmons. "Solving the Entire Chinese Water Crisis Archived 2010-10-19 at the Wayback Machine", The Atlanta Journal-Constitution via The Progress Report. Retrieved on 29 June 2008.
  22. ^ a b "In the World | Philadelphia Inquirer | 19 October 2009". 21 October 2009. Archived from the original on 21 October 2009. Retrieved 14 September 2018.
  23. ^ Chinese Water Diversion Project Kills Fish on Test Run Archived 5 July 2014 at the Wayback Machine, 8 July 2013
  24. ^ "Evolution trend of the water quality in Dongping Lake after South-North Water Transfer Project in China". www.chndoi.org. doi:10.19637/j.cnki.2305-7068.2019.04.004.
  25. ^ Sun, Rong; Wei, Jielin; Zhang, Shasha; Pei, Haiyan (1 April 2024). "The dynamic changes in phytoplankton and environmental factors within Dongping Lake (China) before and after the South-to-North Water Diversion Project". Environmental Research. 246: 118138. doi:10.1016/j.envres.2024.118138. ISSN 0013-9351. PMID 38191041.
  26. ^ Yujun Ma, Xiao-Yan Li, Maxwell Wilson and Xiuchen Wu. "Water loss by evaporation from China's South-North Water Transfer Project".{{cite web}}: CS1 maint: multiple names: authors list (link)
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30°02′30″N 90°36′00″E / 30.0417°N 90.6000°E / 30.0417; 90.6000

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