The Murray–Darling basin is a large geographical area in the interior of southeastern Australia. Its name is derived from its two major rivers, the Murray River and the Darling River. The basin, which drains around one-seventh of the Australian land mass, is one of the most significant agricultural areas in Australia. It spans most of the states of New South Wales and Victoria, the Australian Capital Territory, and parts of the states of Queensland (lower third) and South Australia (southeastern corner). The basin is 3,375 kilometres (2,097 mi) in length, with the Murray River being 2,508 km (1,558 mi) long.
Most of the 1,061,469 km2 (409,835 sq mi) basin is flat, low-lying and far inland, and receives little direct rainfall. The many rivers it contains tend to be long and slow-flowing, and carry a volume of water that is large only by Australian standards.
The Snowy Mountains Scheme provides some security of water flows to the Murray-Darling basin, providing approximately 2,100 gigalitres (7.4×1010 cu ft) of water a year to the basin for use in Australia’s irrigated agriculture industry, which is worth about A$3 billion per annum, representing more than 40% of the gross value of the nation's agricultural production.
Map of the Murray–Darling basin
|Length||3,375 km (2,097 mi)|
|Area||1,061,469 km2 (409,835 sq mi)|
The basin was once home to a large number of Aboriginal people whose traditional lifestyle and cultures were gradually altered by the arrival of Europeans, while others were outright killed by the settlers. Although some tribes organised resistance, such as the Maraura, whose territory lay around the Rufus River above Renmark and the Tanganekald near The Coorong, they were eventually either killed, exiled, or succumbed to disease.
The Murray–Darling basin is home to many native animal species. The true numbers may not be known, but a fairly confident estimate has been made of these animals and the current status of their population. Among the aboriginal fauna in the region, the study found that there were:
Historical records show that the previous abundances of fish provided a reliable food source. The bountiful fish became concentrated when the early stages of a flood left shallow water across the floodplain. Today, roughly 24 native freshwater fish and another 15-25 marine and estuarine species are existent in the basin, a very low biodiversity.
Over Christmas 2018 and January 2019 there were two mass deaths of fish in the waters of the basin, the first numbering 10,000, the second in the 100,000s. Species affected were Murray cod, golden perch, silver perch and bony herring. Some blamed the draining of water from the Menindee Lakes by WaterNSW, with only 2.5% of the original water volume in the lakes being left; after the first fish kill, both the Department of Primary Industries (DPI) and WaterNSW blamed the ongoing drought affecting Australia, while the DPI blamed the second kill on a disruption of an algal bloom caused by falling temperature.
Four varieties of carp were used to stock up fish dams. Since then they have made their way into the river systems, where they spread quite quickly. Human introduction, possibly by anglers using small carp illegally as live bait has also increased their distribution. These fish are very mobile, breed rapidly and can survive in very shallow water and through long periods of very low dissolved oxygen content.
Carp are a problem because they feed by sucking gravel from the riverbed and taking all the edible material off it, before returning the rest to the water. This stirs up all the sediment, reducing the quality of the water. A project for developing daughterless carp shows promise for eliminating carp from the river system.
Cane toads have entered the upper reaches of the Darling Basin and there are several reports of individuals being found further down the system. Cane toads compete with native amphibians and are toxic to native carnivores.
This area is one of the physiographic provinces of the larger East Australian basins division, and encompasses the smaller Naracoorte Platform and Encounter Shelf physiographic sections.
Total water flow in the Murray–Darling basin 1885 to the present has averaged around 24,000 gigalitres (24,000 hm3; 19,000,000 acre⋅ft) per year. This is the lowest rate of the world's major river systems. About 6.0 percent of Australia's total rainwater falls into the basin. In most years only half of this quantity reaches the sea and in dry years much less. Estimated total annual flows for the basin have ranged from 5,000 gigalitres (5,000 hm3; 4,100,000 acre⋅ft) in 1902 to 57,000 gigalitres (57,000 hm3; 46,000,000 acre⋅ft) in 1956. Despite the magnitude of the basin, the hydrology of the streams within it is quite varied.
These waters are divided into four types:
The two principal rivers of the basin, the Murray and Darling, bring water from the high ranges of the east and carry it west then south through long flat and dry inland areas, often resulting in alluvial channel wetlands, such as The (Great) Cumbung Swamp, at the terminus of the Lachlan and Murrumbidgee Rivers. Nevertheless, these waters are subject to major diversions for municipal drinking supplies and irrigated agriculture that began in the 1890s. Currently, 4 major reservoirs, 14 lock and weir structures, and five coastal barrages interject the water flowing down the Murray-Darling. Of the approximately 13,000 gigalitres (13,000 hm3; 10,500,000 acre⋅ft) of flow in the basin, which studies have shown to be divertible, 11,500 gigalitres (11,500 hm3; 9,320,000 acre⋅ft) are removed for irrigation, industrial use, and domestic supply. Agricultural irrigation accounts for about 95 percent of the water removed, including for the growing of rice and cotton. This extraction is highly controversial among scientists in Australia, regarding the agriculture industry's high water use in a region extremely short of water (as much due to exceptionally low run-off coefficients as to low rainfall). These extensive irrigation systems require a reliable supply of water, not the unpredictable flows that characterise the Murray-Darling. These structures and irrigation implements were ideal when there was a steady flow of water. However, during “the Big Dry,” as the early 2000s drought came to be known, Australian farmers experienced a scarcity unlike ever before. The drought was so severe that numerous rivers and streams such as the Murray-Darling stopped flowing. The basin contains more than 30,000 wetlands. Eleven of these are protected under the Ramsar Convention of Wetlands of International Importance.
The rivers listed below comprise the Murray–Darling basin and its direct significant tributaries, with elevations of their confluence with the downstream river. The tributary with the highest elevation is Swampy Plain River that rises in the Snowy Mountains, below Mount Kosciuszko at an elevation of 2,120 metres (6,960 ft), and ends merging with the Murray River, descending 1,860 metres (6,100 ft).
The ordering of the basin, from downstream to upstream, is:
|Rivers of the Murray–Darling basin|
|Catchment river||Elevation at
|River mouth||States||River length|
|Murray River||0||0||Southern Ocean||NSW, Vic, SA||2,375||1,476|
|Paroo River||94||308||Darling||Qld, NSW||1,210||750|
|Warrego River||98||322||Darling||Qld, NSW||1,380||860|
|Culgoa River||109||358||Darling||Qld, NSW||489||304|
|Barwon River (New South Wales)||110||360||Darling||NSW||700||430|
|Bokhara River||113||371||Barwon||Qld, NSW||347||216|
|Peel River (New South Wales)||286||938||Namoi||NSW||210||130|
|Macdonald River (Bendemeer)||705||2,313||Namoi||NSW||169||105|
|Rocky River (New South Wales)||760||2,490||Gwydir||NSW||138||86|
|Boomi River||152||499||Barwon||NSW, Qld||231||144|
|Little River (Dubbo)||271||889||Macquarie||NSW||122||76|
|Bell River (New South Wales)||285||935||Macquarie||NSW||146||91|
|Fish River (New South Wales)||668||2,192||Macquarie||NSW||119||74|
|Weir River (Queensland)||166||545||Barwon||Qld, NSW||197||122|
|Macintyre River||224||735||Barwon||NSW, Qld||319||198|
|Pike Creek (Queensland)||360||1,180||Dumaresq||Qld||117||73|
|Mole River (New South Wales)||363||1,191||Dumaresq||Qld||73||45|
|Bluff River (New South Wales)||614||2,014||Mole||NSW||13||8.1|
|Severn River (Queensland)||375||1,230||Dumaresq||Qld, NSW||90||56|
|Severn River (New South Wales)||284||932||Macintyre||NSW||52||32|
|Beardy Waters||884||2,900||Severn (NSW)||NSW||70||43|
|Little River (Parkes)||305||1,001||Bogan||NSW||319||198|
|Murrumbidgee River||55||180||Murray||NSW, ACT||1,488||925|
|Isabella River (New South Wales)||479||1,572||Abercrombie||NSW||51||32|
|Molonglo River||440||1,440||Murrumbidgee||NSW, ACT||115||71|
|Jerrabomberra Creek||554||1,818||Molonglo||NSW, ACT||35||22|
|Sullivans Creek||556||1,824||Molonglo||NSW, ACT||13||8.1|
|Queanbeyan River||567||1,860||Molonglo||NSW, ACT||104||65|
|Paddys River (Australian Capital Territory)||477||1,565||Cotter||ACT||28||17|
|Big Badja River||735||2,411||Numeralla||NSW||32||20|
|Edward River (an anabranch)||61||200||Murray||NSW||383||238|
|Little Murray River (Victoria)||67||220||Murray||Vic||46||29|
|Little Murray River (New South Wales)||75||246||Murray||NSW||22||14|
|Goulburn River, Victoria||100||330||Murray||Vic||654||406|
|Broken River (Victoria)||118||387||Goulburn||Vic||225||140|
|Little River (Cathedral Range)||207||679||Acheron||Vic||22||14|
|Big River (Goulburn River, Victoria)||259||850||Goulburn||Vic||62||39|
|Little Coliban River||501||1,644||Coliban||Vic||12||7.5|
|King River, Victoria||142||466||Ovens||Vic||126||78|
|Buffalo River (Australia)||206||676||Ovens||Vic||65||40|
|Catherine River (Victoria)||392||1,286||Buffalo||Vic||25||16|
|Buckland River (Victoria)||274||899||Ovens||Vic||38||24|
|Kiewa River||156||512||Murray||Vic, NSW||109||68|
|Mitta Mitta River||180||590||Murray||Vic||204||127|
|Dart River (Victoria)||452||1,483||Mitta Mitta||Vic||29||18|
|Big River (Mitta Mitta River, Victoria)||655||2,149||Mitta Mitta||Vic||52||32|
|Cobungra River||656||2,152||Mitta Mitta||Vic||55||34|
|Victoria River (Victoria)||830||2,720||Cobungra||Vic||25||16|
|Swampy Plain River||269||883||Murray||NSW, Vic||59||37|
|Geehi River||439||1,440||Swampy Plain||Vic||47||29|
The basin effects five states and territory governments, which according to the Constitution, are responsible for managing water resources. The River Murray Commission was established in 1917. Under the River Murray Waters Agreement, which did not include Queensland though about a quarter of the basin lays in the state, the Commission was an advisory body with no authority for enforcement of provisions. For a long time the Commission was only concerned with water quantity until salinity became a problem. This led to minor reforms in 1982 in which water quality became part of the Commission's responsibilities.
However, it was soon recognised that a new organisational structure which considered the national perspective was needed for effective management. The Murray–Darling Basin Agreement was first adopted in 1985 but it wasn't until 1993 that its full legal status was enacted. The Agreement led to the creation of a number of new organisations under what is known as the Murray-Darling Basin Initiative. These included the Murray-Darling Basin Ministerial Council and the Murray Darling Basin Commission.
The Murray–Darling Basin Authority (MDBA) was formed in 2008 to manage the Murray-Darling basin in an integrated and sustainable manner, in conjunction with the Basin states. The MDBA is responsible for preparing and overseeing a legally-enforceable management plan. In October 2010, MDBA released a draft Murray-Darling Basin Plan (MDBP) for consultation. After a difficult consultation process, on 22 November 2012, Tony Burke, Minister for Sustainability, Environment, Water, Population and Communities, signed the Murray-Darling Basin Plan, which passed the Australian Parliament's disallowance period on 19 March 2013.
The MDBA's draft Murray-Darling Basin Plan, titled the Guide to the Proposed Murray–Darling Basin Plan, was released in October 2010 as the first part of a three-stage process to address the problems of the Murray–Darling basin. The Plan was in response to the 2000s Australian drought, and designed to secure the long-term ecological health of the Murray–Darling basin. This entailed cutting existing water allocations and tree growth environmental flows. The Basin Plan was designed to set environmentally sustainable limits on the quantities of water that may be taken from Basin water resources, to set Basin-wide environmental, water quality and salinity objectives, to develop efficient water trading regimes across the Basin, to set requirements for state water resource plans and to improve water security for all Basin users. It also intends to minimise social and economic impacts whilst achieving the plan's environmental outcomes.
With the release of the Guide to the Proposed Murray–Darling Basin Plan there have been a number of protests and voiced concerns about the plan in rural towns that the MDBA visited to present the plan to consultation meetings. More than 5,000 people attended a MDBA meeting in Griffith where Griffith Mayor, Mike Neville, said the plan would "obliterate" Murrumbidgee valley communities. Other groups also echo this feeling, such as the Victorian Farmers Federation and Wine Group Growers' Australia. Conversely, support for the Murray–Darling Basin plan has been received by various groups, including Australian Conservation Foundation, and Environment Victoria.
New legal advice from Commonwealth government lawyers is changing the plan. The Government's interpretation is that the plan must give equal weight to the environmental, social, and economic impacts of proposed cuts to irrigation.
Environmentalists and South Australian irrigators, at the end of the river in South Australia, say that the authority should stick to its original figure.
In October 2010, a parliamentary inquiry into the economic impacts of the plan was announced.
In late October 2010 the Water Minister, Tony Burke, played down the prospect of a High Court challenge to the Murray–Darling Basin plan, as confusion continued over new legal advice released by the Government. In response to community concerns that MDBA had put environmental issues first over social and economic needs, Burke released new advice on the requirements of the Water Act. Burke stated that the Act does allow for the authority to "optimise" the needs of all three areas, but constitutional lawyer, George Williams, had cast doubts over the interpretation of the laws, stating it could be subject to a legal challenge.
The MDBA announced in November 2010 that it might be forced to push back the release of its final plan for the river system until early 2012.
The then MDBA chairman, Mike Taylor, reassured the public meeting that more work is being done to look at how the proposed cuts would affect regional communities. He stated: "Importantly, we want to make sure the social and economic impacts—which under any sort of scenario is very significant—were fully teased out". Taylor resigned as he allegedly believed that the overriding principle should be the environmental outcome which was in conflict with the Gillard Government and following a period of sustained criticism of the Authority and the implementation of the proposed draft basin plan. He was replaced by former New South Wales Planning Minister, Craig Knowles.
In late May 2012, the revised plan was forwarded to state water ministers. It did not alter the recommendation to cut 2,750 gigalitres (2.75 km3; 2,230,000 acre⋅ft) of water entitlements.
Following much negotiation between the Commonwealth and State governments and numerous submissions from interested stakeholders and the community, the Basin Plan became law in November 2012 and can now be implemented.
Although the Murray-Darling Basin Plan (MDBP) is a River Murray which has only dried up twice since records began). The Environmental Water Requirement found that a reduction in allocations of 7,600 GL (7.60 km3; 6,160,000 acre⋅ft) (per year) is required to be certain that the river systems would maintain their health. However objectors cite socio-economic impacts of major cutbacks to the widescale farming (and in some areas wine-growing) in the basin, and conclude that within plans for population growth, particularly in times of drought, may be a need for sustainable water transportation from new extraction from rivers in the wettest part of the country, the Cape York Peninsula or more desalination.towards sustainability the measures keep a significant risk of human activities exacerbating the drought risk (see
The Adelong Creek, a perennial river that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes, and Riverina regions of New South Wales, Australia.Adjungbilly Creek
The Adjungbilly Creek, a mostly–perennial river that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes and Riverina regions of New South Wales, Australia.Barmedman Creek
The Barmedman Creek, a mostly–perennial river that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes, and Riverina regions of New South Wales, Australia. The Barmedman Creek is only connected to the Murray Darling basin when the Bland Creek, the Lachlan and Murrumbidgee Rivers are in flood.Berthong Creek
The Berthong Creek, a mostly–perennial river that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes, and Riverina regions of New South Wales, Australia. The Berthong Creek is only connected to the Murray Darling basin when the Bland Creek, the Lachlan and Murrumbidgee Rivers are in flood.Bland Creek
The Bland Creek, a mostly–perennial river that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes, and Riverina regions of New South Wales, Australia. The Bland Creek is only connected to the Murray Darling basin when both the Lachlan and Murrumbidgee Rivers are in flood.Bowning Creek
The Bowning Creek, a mostly–perennial river that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes and Riverina regions of New South Wales, Australia.Bulla Creek
The Bulla Creek, a mostly–perennial river that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes region of New South Wales, Australia. The Bulla Creek is only connected to the Murray Darling basin when the Bland Creek and both the Lachlan and Murrumbidgee Rivers are in flood.Burkes Creek
The Burkes Creek, a mostly–perennial river that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Riverina region of New South Wales, Australia.Cooks Vale Creek
The Cooks Vale Creek, a mostly–perennial river that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes region of New South Wales, Australia.Jerra Jerra Creek
The Jerra Jerra Creek, a perennial stream of the Murray River catchment within the Murray-Darling basin, is located in the Riverina region of New South Wales, Australia.Jugiong Creek
The Jugiong Creek, a mostly–perennial river that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes region of New South Wales, Australia.Kindra Creek
The Kindra Creek, a watercourse that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Riverina and South West Slopes regions of New South Wales, Australia.Little Murray River (New South Wales)
Little Murray River (New South Wales), an anabranch of the Murray River and part of the Murray-Darling basin, is located in the western Riverina region of south western New South Wales, Australia.
The river rises northwest of Barham in New South Wales and flows generally northwest before reaching its confluence with the Murray River near Gonn Crossing in Victoria. Little Murray River and the Murray River enclose Campbells Island, that forms part of the Campbells Island State Forest.Mirrool Creek
The Mirrool Creek, a watercourse that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Riverina region of New South Wales, Australia. The course of the Mirrool Creek is indefinite at various locations.Narran River
Narran River, a watercourse of the Barwon catchment within the Murray–Darling basin, is located in the Southern Downs district of Queensland and Orana district of New South Wales, Australia.
The river rises south west of Dirranbandi, as a branch of the Balonne River in Queensland, and flows generally to the south and south-west, before reaching its mouth at Narran Lake, between Brewarrina and Walgett in New South Wales; descending 61 metres (200 ft) over its 299 kilometres (186 mi) course.In March 2010 the Narran River flooded the Angledool Lake at Angledool and then spilled into Weetalabah Creek, crossing the Castlereagh Highway, filling Coocoran Lake near Lightning Ridge.Niemur River
Niemur River, a perennial stream of the Murray catchment and part of the Murray-Darling basin, is located in the western Riverina region of south western New South Wales, Australia.
The river leaves Edward River, near Moonahcullah, flowing generally west north-west, joined by five minor tributaries, before reaching its confluence with the Wakool River, north of Swan Hill; descending 29 metres (95 ft) over its 155 kilometres (96 mi) course.Peelwood Creek
The Peelwood Creek, a watercourse that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the South West Slopes region of New South Wales, Australia.Rufus River
Rufus River, a watercourse of the Murray catchment and part of the Murray-Darling basin, is located in the western Riverina region of south western New South Wales, Australia.
The river leaves Lake Victoria, flowing generally west and then south-west, before reaching its confluence with the Murray River, at Lock 7, near Rufus.
Rufus River was discovered by European explorer, Charles Sturt, in 1830, and named after his red-haired (or rufus) travelling companion, George Macleay.Sandy Creek (Mirrool)
The Sandy Creek, a partly–perennial stream that is part of the Lachlan sub-catchment of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Riverina region of New South Wales, Australia. The course of the Sandy Creek becomes indefinite at its mouth.
Rivers of the Murray–Darling basin, Australia
Drainage basins of Australia