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.
The
California State Water Project built in stages in the 1960s and 1970s to transfer water from Northern to Southern California. It includes the
California Aqueduct and the
Edmonston Pumping Plant, which lifts water nearly 2,000 feet (610 meters) up and over the
Tehachapi Mountains through 10 miles of tunnels for municipal water supply in the Los Angeles Metropolitan area.
The Cutzamala System built in stages from the late 1970s to the late 1990s to transfer water from the
Cutzamala River to
Mexico City for use as drinking water, lifting it over more than 1000 meters. It utilizes 7 reservoirs, a 127 km long aqueduct with 21 km of tunnels, 7.5 km open canal, and a water treatment plant. Its cost was US$1.3 billion.[2] See also
Water resources management in Mexico
The
Catskill Aqueduct, completed in 1916, is significantly larger than New Croton and brings water from two reservoirs in the eastern
Catskill Mountains.
The
Delaware Aqueduct, completed in 1945, taps tributaries of the
Delaware River in the western Catskill Mountains and provides approximately half of New York City's water supply.[3]
The
Colorado–Big Thompson Project, built between 1938 and 1957, diverts water from the upper Colorado River basin east underneath the Continental Divide to the South Platte basin.[4]
The Little Snake - Douglas Creek System, built in two stages between 1963 and 1988, moves water under the Continental Divide in southern Wyoming from the upper Colorado River basin to the North Platte basin. This is then traded for water from elsewhere in the North Platte basin, which is diverted to provide water for Cheyenne.[5]
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
The
Narmada Canal Project offtaking from
Sardar Sarovar in western India transfers water from the
Narmada Basin to areas coming under other river basins in
Gujarat (
Mahi,
Sabarmati and other small river basins in
North Gujarat,
Saurashtra and
Kutch) and
Rajasthan (
Luni and other basins of
Jalore and
Barmer districts) for irrigation, drinking water, industrial use, etc.[6] The canal is designed to transfer 9.5 million acre-feet (11.7 km3) water annually from the
Narmada Basin to areas under other basins in Gujarat and Rajasthan. (9 MAF for Gujarat and 0.5 MAF for Rajasthan).[7]
The Periyar Project in Southern India from the
Periyar River in
Kerala to the
Vaigai basin in
Tamil Nadu. It consists of a dam and a tunnel with a discharging capacity of 40.75 cubic meters per second. The project was commissioned in 1895 and provides irrigation to 81,000 hectares, in addition to providing power through a plant with a capacity of 140 MW.[8]
The
ParambikulamAliyar project, also in Southern India, consists of seven streams, five flowing towards the west and two towards the east, which have been dammed and interlinked by tunnels. The project transfers water from the
Chalakudy River basin to the
Bharatapuzha and
Cauvery basins for irrigation in
Coimbatore district of
Tamil Nadu and the
Chittur area of
Kerala states. It also serves for power generation with a capacity of 185 MW.[8]
The
KurnoolCudappah Canal in Southern India is a scheme started by a private company in 1863, transferring water from the
Krishna River basin to the
Pennar basin. It includes a 304 km long canal with a capacity of 84.9 cubic meters per second for irrigation.[8]
The
Telugu Ganga project in Southern India. This project primarily meets the water supply needs of
Chennai metropolitan area, but is also used for irrigation. It brings
Krishna River water through 406 km of canals. The project, which was approved in 1977 and completed in 2004, involved the cooperation of four Indian States:
Maharashtra,
Karnataka,
Andhra Pradesh and
Tamil Nadu.[8]
The
Indira Gandhi Canal (formerly known as the Rajasthan Canal) linking the
Ravi River, the
Beas River and the
Sutlej River through a system of dams, hydropower plants, tunnels, canals and irrigation systems in Northern India built in the 1960s to irrigate the
Thar Desert.[8]
The
National Water Carrier in Israel, transferring water from the
Sea of Galilee (
Jordan River Basin) to the Mediterranean coast lifting water over 372 meters. Its water is used both in agriculture and for municipal water supply.
The
Mahaweli Ganga Project in Sri Lanka includes several inter basin transfers.
The
Irtysh–Karaganda Canal in central Kazakhstan is about 450 km long with a maximum capacity of 75 cubic meters per second. It was built between 1962 and 1974 and involves a lift of 14 to 22 m.[8]
Part of the water flowing northwards down
Tung Chung River in northern Lantau is diverted across the mountain ridge to
Shek Pik Reservoir in southern Lantau.
The IRTS (Inter-Reservoirs Transfer Scheme) which transfers water from the
Kowloon Byewash Reservoir to the
Lower Shing Mun Reservoir, 2.8 kilometres (1.7 miles) in length and 3 metres (9.8 ft) in diameter.
Various transfers from the
Ebro River in Spain, which flows to the Mediterranean, to basins draining to the Atlantic, such as Ebro-Besaya transfer of 1982 to supply the industrial area of
Torrelavega, the Cerneja-Ordunte transfer to the
Bilbao Metropolitan area of 1961, as well as the Zadorra-Arratia transfer that also supplies Bilbao through the Barazar waterfall (Source:Spanish Wikipedia article on the Ebro River. See
Water supply and sanitation in Spain).
The
Snowy Mountains Scheme in Australia, built between 1949 and 1974 at the cost (at that time) of A$800 million; a dollar value equivalent in 1999 and 2004 to A$6 billion (US$4.5 billion).
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:
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.
The so-called "Peninsular river component" of India's
National Water Development Plan envisages to divert the
Mahanadi River surplus to the
Godavari and the surplus therefrom to the
Krishna,
Pennar and
Cauvery, with "terminal dams" on the Mahanadi and the Godavari to enable irrigation. The Peninsular component also envisages three more transfers — (a) to divert a part of the waters of the west flowing rivers of
Kerala to the arid east to meet the needs of
Tamil Nadu; (b) to interlink the west flowing rivers north of
Mumbai and south of
Tapi to provide irrigation to areas in
Saurashtra,
Kachchh and coastal
Maharashtra and to augment the drinking water supplies to
Mumbai; and (c) to interlink the southern tributaries of the
Yamuna and provide irrigation facilities in parts of
Madhya Pradesh and
Rajasthan.[18][19]
From Northern Russia and Siberia to Central Asia through the
Northern river reversal. The proposal, originally dating to
Joseph Stalin's and
Nikita Khrushchev's eras, included a Western and Eastern route, in the European and Asian parts of the then Soviet Union respectively. The suggested Western route would be from the
Pechora River to the
Kama River, a tributary of the
Volga, along the abandoned and uncompleted
Pechora–Kama Canal. The Eastern route would be from the
Tobol River,
Ishim River and
Irtysh River in the
Ob basin to the desert plains of Kazakhastan and the
Aral Sea basin. In 2006 Kazakh president
Nursultan Nazarbayev said he wanted to resuscitate the scheme that had been abandoned by the Soviet Union in 1986. The cost of that route alone is estimated at upwards from US$40 billion, well beyond the means of
Kazakhstan.[21]
The western route of the
South–North Water Transfer Project in China, which foresees to divert water from the headwater of
Yangtze (and possibly also the headwaters of
Mekong or
Salween downstream) into the headwater of
Yellow River. If the Mekong and Salween rivers were included in the project this would affect the downstream riparian countries Burma, Thailand, Laos, Cambodia and Vietnam.
The Kimberley Pipeline Scheme to supply
Perth with water through, proposed because of radical
rainfall changes in
Western Australia since the late 1960s
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]
^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)
^The Changing Geography of Africa and the Middle East By Graham Chapman, Kathleen M. Baker, University of London School of Oriental and African Studies, 1992
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