Interbasin transfer explained

Interbasin transfer or transbasin diversion are (often hyphenated) terms used to describe man-made conveyance schemes which move water from one river basin where it is available, to another basin where water is less available or could be utilized better for human development. The purpose of such water resource engineering schemes can be to alleviate water shortages in the receiving basin, to generate electricity, or both. Rarely, as in the case of the Glory River which diverted water from the Tigris to Euphrates River in modern Iraq, interbasin transfers have been undertaken for political purposes. While ancient water supply examples exist, the first modern developments were undertaken in the 19th century in Australia, India and the United States, feeding large cities such as Denver and Los Angeles. Since the 20th century many more similar projects have followed in other countries, including Israel and China, and contributions to the Green Revolution in India and hydropower development in Canada.

Since conveyance of water between natural basins are described as both a subtraction at the source and as an addition at the destination, such projects may be controversial in some places and over time; they may also be seen as controversial due to their scale, costs and environmental or developmental impacts.

In Texas, for example, a 2007 Texas Water Development Board report analyzed the costs and benefits of IBTs in Texas, concluding that while some are essential, barriers to IBT development include cost, resistance to new reservoir construction and environmental impacts.[1] Despite the costs and other concerns involved, IBTs play an essential role in the state's 50-year water planning horizon. Of 44 recommended ground and surface water conveyance and transfer projects included in the 2012 Texas State Water Plan, 15 would rely on IBTs.[1]

While developed countries often have exploited the most economical sites already with large benefits, many large-scale diversion/transfer schemes have been proposed in developing countries such as Brazil, African countries, India and China. These more modern transfers have been justified because of their potential economic and social benefits in more heavily populated areas, stemming from increased water demand for irrigation, industrial and municipal water supply, and renewable energy needs. These projects are also justified because of possible climate change and a concern over decreased water availability in the future; in that light, these projects thus tend to hedge against ensuing droughts and increasing demand. Projects conveying water between basins economically are often large and expensive, and involve major public and/or private infrastructure planning and coordination. In some cases where desired flow is not provided by gravity alone, additional use of energy is required for pumping water to the destination. Projects of this type can also be complicated in legal terms, since water and riparian rights are affected; this is especially true if the basin of origin is a transnational river. Furthermore, these transfers can have significant environmental impacts on aquatic ecosystems at the source. In some cases water conservation measures at the destination can make such water transfers less immediately necessary to alleviate water scarcity, delay their need to be built, or reduce their initial size and cost.

Existing transfers

There are dozens of large inter-basin transfers around the world, most of them concentrated in Australia, Canada, China, India and the United States. The oldest interbasin transfers date back to the late 19th century, with an exceptionally old example being the Roman gold mine at Las Médulas in Spain. Their primary purpose usually is either to alleviate water scarcity or to generate hydropower.

Primarily for the alleviation of water scarcity

Africa

Americas

The Central Arizona Project (CAP) in the USA is not an interbasin transfer per se, although it shares many characteristics with interbasin transfers as it transports large amounts of water over a long distance and difference in altitude. The CAP transfers water from the Colorado River to Central Arizona for both agriculture and municipal water supply to substitute for depleted groundwater. However, the water remains within the watershed of the Colorado River, though transferred into the Gila sub-basin.

Asia

Australia

Europe

Characteristics of major existing interbasin transfers and other large-scale water transfers to alleviate water scarcity

Year of constructionLengthCapacity (Million cubic meters/year)Costs (US$ bn)
California State Water Project (USA)Early 1960s-1990s715 km25 (10,300 cubic feet/sec)5.2
Colorado River Aqueduct (USA)1933–1941392 km1603.5 (1.3m acre-feet/year)?
Central Arizona Project (USA)1973–1993541 km1850.2 (1.5m acre-feet/year)3.6
National Water Carrier (Israel)1953–1964130 km1.7?
Cutzamala System (Mexico)Late 1970s-late 1990s154 km2.1 (24 m3/s)1.3
All-American Canal (USA)1930s132 km64 (740 m3/s)?
Narmada Canal (India)Commissioned in 2008532 km11,718 (9.5m acre-feet/year) ?
Periyar Project (India)Commissioned in 1895?3.5 (41 m3/s)?
Indira Gandhi Canal (India)Since 1958650 km??
Telugu Ganga project (India)1977–2004406 km10.1 (3.7 bn m3/year)?
IrtyshKaraganda scheme (Kazakhstan)1962–1974450 km6.5 (75 m3/s)?

For the generation of hydropower

Africa

Australia

Canada

In Canada, sixteen interbasin transfers have been implemented for hydropower development. The most important is the James Bay Project from the Caniapiscau River and the Eastmain River into the La Grande River, built in the 1970s. The water flow was reduced by 90% at the mouth of the Eastmain River, by 45% where the Caniapiscau River flows into the Koksoak River, and by 35% at the mouth of the Koksoak River. The water flow of the La Grande River, on the other hand, was doubled, increasing from 1,700 m³/s to 3,400 m³/s (and from 500 m³/s to 5,000 m³/s in winter) at the mouth of the La Grande River. Other interbasin transfers include:

British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Northwest Territories
Nova Scotia
Ontario
Quebec
Saskatchewan

Asia

For other purposes

The Chicago Sanitary and Ship Canal in the US, which serves to divert polluted water from Lake Michigan.

Transfers under construction

The Eastern and Central Routes of the South–North Water Transfer Project in China from the Yangtse River to the Yellow River and Beijing.

Proposed transfers

Nearly all proposed interbasin transfers are in developing countries. The objective of most transfers is the alleviation of water scarcity in the receiving basin(s). Unlike in the case of existing transfers, there are very few proposed transfers whose objective is the generation of hydropower.

Africa

From the Ubangi River in Congo to the Chari River which empties into Lake Chad. The plan was first proposed in the 1960s and again in the 1980s and 1990s by Nigerian engineer J. Umolu (ZCN Scheme) and Italian firm Bonifica (Transaqua Scheme).[10] [11] [12] [13] [14] In 1994, the Lake Chad Basin Commission (LCBC) proposed a similar project and at a March, 2008 Summit, the Heads of State of the LCBC member countries committed to the diversion project.[15] In April, 2008, the LCBC advertised a request for proposals for a World Bank-funded feasibility study.

Americas

Asia

Australia

Europe

From the Ebro River in Spain to Barcelona in the Northeast and to various cities on the Mediterranean coast to the Southwest

Ecological aspects

Since rivers are home to a complex web of species and their interactions, the transfer of water from one basin to another can have a serious impact on species living therein.[22]

See also

Further reading

Notes and References

  1. http://www.window.state.tx.us/specialrpt/water/96-1746.pdf Texas Water Report: Going Deeper for the Solution
  2. https://archive.today/20130811234745/http://ambio.allenpress.com/perlserv/?request=get-document&doi=10.1639/0044-7447(2003)032%5B0124:WMFAMM%5D2.0.CO;2&ct=1 Cecilia Tortajada and Enrique Castelán:Water Management for a Megacity: Mexico City Metropolitan Area
  3. Web site: New York City's Water Supply System Map . . 2009-09-03 . 2009-10-14 . https://web.archive.org/web/20091014101349/http://www.nyc.gov/html/dep/html/drinking_water/wsmaps_wide.shtml . dead .
  4. Web site: Northern Water C-BT Project. www.northernwater.org. 2019-03-07.
  5. Web site: Where does Cheyenne get its Water. City of Cheyenne. 2024-05-04.
  6. Web site: Salient Features of Sardar Sarovar Project: Narmada Main Canal System. Narmada Control Authority (NCA). 28 November 2021.
  7. Web site: Salient Features of NWDT Award. Narmada Control Authority (NCA). 28 November 2021.
  8. http://www.nwda.gov.in/index2.asp?sublinkid=45&langid=1 National Water Development Agency of India:Existing Experience with Interbasin Transfers
  9. http://www.warthog.co.za/dedt/tourism/drakensberg/north/storage.htm Drakensberg Pumped Storage Scheme
  10. http://hydroweb.com/jeh/jeh1999/bunu.pdf Journal of Environmental Hydrology, Vol. 7, 1999
  11. https://www.newscientist.com/article.ns?id=mg12917615.500 New Scientist, March 23, 1991 Africa at a Watershed (Ubangi - Lake Chad Inter-basin transfer)
  12. Umolu, J. C.; 1990, Macro Perspectives for Nigeria's Water Resources Planning, Proc. of the First Biennial National Hydrology Symposium, Maiduguri, Nigeria, pp. 218-262(discussion of Ubangi-Lake Chad diversion schemes)
  13. The Changing Geography of Africa and the Middle East By Graham Chapman, Kathleen M. Baker, University of London School of Oriental and African Studies, 1992Routledge
  14. http://dwb.unl.edu/Teacher/NSF/C09/C09Links/www.ccnet.com/~mcumolu/globclim.html Combating Climate Induced Water And Energy Deficiencies In West Central Africa (Ubangi - Lake Chad Inter-basin transfer)
  15. http://www.voanews.com/english/2008-03-28-voa33.cfm Voice of America News, March 28, 2008 African Leaders Team Up to Rescue Lake Chad
  16. http://www.hickorygov.com/hickoryitb.html City of Hickory:Interbasin transfer information
  17. http://www.ajc.com/news/atlanta/public-132757.html
  18. http://www.nwda.gov.in/writereaddata/sublinkimages/11.jpg National Water Development Agency of India:Proposed Interbasin Transfer Links - Peninsular Component
  19. , in:The Hindu, Nov. 19, 2002
  20. http://www.nwda.gov.in/writereaddata/sublinkimages/10.jpg National Water Development Agency of India:Proposed Interbasin Transfer Links - Himalayan Component
  21. http://iwpr.net/?apc_state=hrubbca323728&l=en&s=b&p=bca&o=323728 Siberian River Project Revived
  22. Mussen . T. D. . Cocherell . D. . Poletto . J. B. . Reardon . J. S. . Hockett . Z. . Ercan . A. . Bandeh . H. . Kavvas . M. L. . Cech Jr . J. J. . Fangue . N. A. . Fulton . Christopher J . Unscreened Water-Diversion Pipes Pose an Entrainment Risk to the Threatened Green Sturgeon, Acipenser medirostris . 10.1371/journal.pone.0086321 . PLOS ONE . 9 . 1 . e86321 . 2014 . 24454967. 3893286. 2014PLoSO...986321M . free .