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103-561: The Lake Eyre basin ( / ɛər / AIR ) is a drainage basin that covers just under one-sixth of all Australia . It is the largest endorheic basin in Australia and amongst the largest in the world, covering about 1,200,000 square kilometres (463,323 sq mi), including much of inland Queensland , large portions of South Australia and the Northern Territory , and a part of western New South Wales . The basin

206-606: A Community Advisory Committee to provide advice and facilitate community participation and a Scientific Advisory Panel to advise on scientific and technical issues. On 7 September 2018 the Lake Eyre Basin Ministerial Forum agreed to release the second review of the agreement. Low density grazing is the major land use, occupying 82% of the total land within the basin. Significant minerals deposits such as oil and natural gas, including Australia's most significant onshore petroleum reserves, are found within

309-476: A Territorian's vote for a senator would have been worth more than 30 such votes in New South Wales or Victoria ). Alongside what was cited as an arrogant approach adopted by then chief minister Shane Stone , it is believed that most Territorians, regardless of their general views on statehood, were reluctant to adopt the particular offer that was made. The chief minister is the head of government of

412-498: A closed drainage basin, or endorheic basin , rather than flowing to the ocean, water converges toward the interior of the basin, known as a sink , which may be a permanent lake, a dry lake , or a point where surface water is lost underground . Drainage basins are similar but not identical to hydrologic units , which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system . Hydrologic units are defined to allow multiple inlets, outlets, or sinks. In

515-444: A drainage basin are catchment area , catchment basin , drainage area , river basin , water basin , and impluvium . In North America, they are commonly called a watershed , though in other English-speaking places, "watershed" is used only in its original sense, that of the drainage divide line. A drainage basin's boundaries are determined by watershed delineation , a common task in environmental engineering and science. In

618-454: A drainage basin, and there are different ways to interpret that data. In the unlikely event that the gauges are many and evenly distributed over an area of uniform precipitation, using the arithmetic mean method will give good results. In the Thiessen polygon method, the drainage basin is divided into polygons with the rain gauge in the middle of each polygon assumed to be representative for

721-540: A drainage boundary is referred to as watershed delineation . Finding the area and extent of a drainage basin is an important step in many areas of science and engineering. Most of the water that discharges from the basin outlet originated as precipitation falling on the basin. A portion of the water that enters the groundwater system beneath the drainage basin may flow towards the outlet of another drainage basin because groundwater flow directions do not always match those of their overlying drainage network. Measurement of

824-560: A great extent geographically overlaps the Great Artesian Basin underneath. The basin began as a sinking landmass mostly covered by forest and contained many more lakes than now. The climate has changed from wet to arid over the last 60 million years. Most of the rivers in the Lake Eyre basin are now slow flowing, flat and completely dry for lengthy periods. When the country north of the basin floods, floodwaters drain via

927-653: A large amount of wildlife , and has no major irrigation, diversions or flood-plain developments. The Cooper Creek , Finke River , Georgina River and Diamantina River are the four main rivers of the basin. Other desert rivers include the Hale River , Plenty River and Todd River that flow from the south east of the Northern Territory, south. In the western parts of the basin the Neales River and Macumba River flow into Lake Eyre. Rivers within

1030-528: A number of protected areas established within the Lake Eyre Basin. The Bradfield Scheme was an ambitious proposal by Dr John Bradfield in 1938. It would use large pipes , tunnels, pumps and dams to divert water from the monsoon -fed Tully , Herbert and Burdekin rivers into the Thomson River , Queensland . After a critical review in 1947 support for the scheme fell through. However, in

1133-405: A part of western New South Wales . During years of especially high rainfall , all the riverbeds in this vast, mostly flat, arid and semi-arid area lead inland (not towards the sea) towards Lake Eyre in central South Australia. Lake Eyre itself lies approximately 16 metres (52 ft) below sea level , and usually contains only salt. In flood years, it fills and, for a short time, undergoes

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1236-401: A period of rapid growth and fertility: long-dormant marine creatures multiply and large flocks of waterfowl arrive to feed and raise their young before the waters evaporate once more. The annual mean runoff in the Lake Eyre Basin is lowest of any of the world's major drainage basins. None of the creeks and rivers in the Lake Eyre Basin are permanent: they flow only after heavy rain –

1339-533: A port masterplan prepared. Extension of rail transport was then not considered because of low freight volumes. Indigenous Australians had struggled for rights to fair wages and land. An important event in this struggle was the strike and walk off by the Gurindji people at Wave Hill Cattle Station in 1966. The Northern Territory Council for Aboriginal Rights (NTCAR) supported the strikers and provided publicity. The Federal government of Gough Whitlam set up

1442-480: A rare to very rare event in the arid interior of Australia. Average annual rainfall in the area surrounding Lake Eyre is 125 millimetres (4.9 in), and the pan evaporation rate is 3.5 metres (11 ft). Annualised average figures are misleading: since 1885 annual rainfall over the 1,100,000 square kilometres (420,000 sq mi) of the Lake Eyre Basin has ranged from about 45 millimetres (1.8 in) in 1928 to over 760 millimetres (30 in) in 1974. Most of

1545-474: A role similar to that of a state governor . Twenty-five members of the Legislative Assembly are elected to four-year terms from single-member electorates . Numerous times since self government was granted there has been agitation for full statehood within the region. A referendum of voters in the Northern Territory was held on the issue in 1998, which resulted in a 'no' vote. This was

1648-699: A self-governing territory (the head of a state government is a premier ). The chief minister is appointed by the administrator , who in normal circumstances appoints the leader of whichever party holds the majority of seats in the Northern Territory Legislative Assembly. The current chief minister is Lia Finocchiaro of the Country Liberal Party . The CLP defeated Territory Labor to win office on 24 August 2024. The Northern Territory became self-governing on 1 July 1978 under its own administrator appointed by

1751-503: A shock to both the Northern Territory and Commonwealth governments, as opinion polls showed most Territorians supported statehood. But under the Australian Constitution, the federal government may set the terms of entry to full statehood. The Northern Territory was offered three senators, rather than the twelve guaranteed to original states (because of the difference in populations, equal numbers of Senate seats would mean

1854-794: A small part of the Canadian provinces of Alberta and Saskatchewan , eastern Central America , the islands of the Caribbean and the Gulf, and a small part of northern South America. The Mediterranean Sea basin, with the Black Sea , includes much of North Africa , east-central Africa (through the Nile River ), Southern , Central, and Eastern Europe , Turkey , and the coastal areas of Israel , Lebanon , and Syria . The Arctic Ocean drains most of Western Canada and Northern Canada east of

1957-826: A strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. About 48.71% of the world's land drains to the Atlantic Ocean . In North America , surface water drains to the Atlantic via the Saint Lawrence River and Great Lakes basins, the Eastern Seaboard of the United States, the Canadian Maritimes , and most of Newfoundland and Labrador . Nearly all of South America east of

2060-513: A vast area of meandering ephemeral channels, making its way roughly south into the far south-west corner of Queensland before turning due west into South Australia towards Lake Eyre. It takes almost a year for water to reach Lake Eyre from the headwaters . In most years, none does: it is absorbed into the earth, goes to fill channels and the many permanent waterholes , or simply evaporates . Water from Cooper Creek reached Lake Eyre in 1990 and then not again until 2010. The deserts that have formed in

2163-401: Is also one of the largest, least-developed arid zone basins with a high degree of variability anywhere. It supports only about 60,000 people and has no major irrigation, diversions or flood-plain developments. Low density grazing that sustains a large amount of wildlife is the major land use, occupying 82% of the total land within the basin. The Lake Eyre basin of precipitation (rain water) to

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2266-764: Is an Australian Aboriginal language spoken on Wangkangurru country. It is closely related to Arabana language of South Australia . The Wangkangurru language region was traditionally in the South Australian-Queensland border region taking in Birdsville and extending south towards Innamincka and Lake Eyre , including the local government areas of the Shire of Diamantina as well as the Outback Communities Authority of South Australia. Indigenous Australians have lived with

2369-479: Is associated with tropical cyclones and monsoon rains. The majority of rainfall occurs between December and March (the southern hemisphere summer), when thunderstorms are common and afternoon relative humidity averages over 70% during the wettest months. On average more than 1,570 mm (62 in) of rain falls in the north. Rainfall is highest in north-west coastal areas, where rainfall averages from 1,800 to 2,100 mm (71 to 83 in). The central region

2472-487: Is referred to as " watershed management ". In Brazil , the National Policy of Water Resources, regulated by Act n° 9.433 of 1997, establishes the drainage basin as the territorial division of Brazilian water management. When a river basin crosses at least one political border, either a border within a nation or an international boundary, it is identified as a transboundary river . Management of such basins becomes

2575-777: Is represented in the federal parliament by two members in the House of Representatives and two members in the Senate. As of May 2022, resulting from the 2022 federal election , Marion Scrymgour from the Australian Labor Party (ALP) in Lingiari and Luke Gosling from the Australian Labor Party (ALP) in Solomon serve in the House of Representatives, and Malarndirri McCarthy from the ALP and Jacinta Nampijinpa Price from

2678-614: Is the Dead Sea . Drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important. For example, the English crown gave the Hudson's Bay Company a monopoly on the fur trade in the entire Hudson Bay basin, an area called Rupert's Land . Bioregional political organization today includes agreements of states (e.g., international treaties and, within

2781-432: Is the desert centre of the country, which includes Alice Springs and Uluru (Ayers Rock), and is semi-arid with little rain usually falling during the hottest months from October to March. Seasons are more distinct in central Australia, with very hot summers and cool winters. Frost is recorded a few times a year. The region receives less than 250 mm (9.8 in) of rain per year. The highest temperature recorded in

2884-615: Is there sufficient upstream rain to provide a flow into Lake Eyre itself. The Finke River , starting roughly west of Alice Springs is thought to be the oldest riverbed in the world and although it flows for only a few days a year (in many years it does not flow at all) is home to seven species of fish, two of which are found nowhere else. The waters of the Finke disappear into the sands of the Simpson Desert and are not definitely known to ever make it as far south as Lake Eyre, although

2987-713: The African Great Lakes , the interiors of Australia and the Arabian Peninsula , and parts in Mexico and the Andes . Some of these, such as the Great Basin, are not single drainage basins but collections of separate, adjacent closed basins. In endorheic bodies of water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this

3090-464: The Andes also drains to the Atlantic, as does most of Western and Central Europe and the greatest portion of western Sub-Saharan Africa , as well as Western Sahara and part of Morocco . The two major mediterranean seas of the world also flow to the Atlantic. The Caribbean Sea and Gulf of Mexico basin includes most of the U.S. interior between the Appalachian and Rocky Mountains ,

3193-765: The Continental Divide , northern Alaska and parts of North Dakota , South Dakota , Minnesota , and Montana in the United States, the north shore of the Scandinavian peninsula in Europe, central and northern Russia, and parts of Kazakhstan and Mongolia in Asia , which totals to about 17% of the world's land. Just over 13% of the land in the world drains to the Pacific Ocean . Its basin includes much of China, eastern and southeastern Russia, Japan,

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3296-455: The Country Liberal Party serve in the Senate. The Northern Territory is divided into seventeen local government areas : two cities, three municipalities, nine regions, and three shires. Shire, city and town councils are responsible for functions delegated by the Northern Territory parliament, such as road infrastructure and waste management. Council revenue comes mostly from property taxes and government grants. Aboriginal land councils in

3399-672: The Governor-General of Australia . The federal government, not the NT government, advises the governor-general on the appointment of the administrator, but by convention consults first with the Territory government. The current administrator is Hugh Heggie who commenced his three-year term on 31 January 2023; he had previously served as the Northern Territory’s Chief Health Officer . The Northern Territory

3502-547: The Indonesian archipelago. The NT covers 1,347,791 square kilometres (520,385 sq mi), making it the third-largest Australian federal division, and the 11th-largest country subdivision in the world . It is sparsely populated, with a population of only 249,000 as of December 2021 – fewer than half as many people as in Tasmania . The largest population centre is the capital city of Darwin , having about 52.6% of

3605-714: The Korean Peninsula , most of Indochina, Indonesia and Malaysia, the Philippines, all of the Pacific Islands , the northeast coast of Australia , and Canada and the United States west of the Continental Divide (including most of Alaska), as well as western Central America and South America west of the Andes. The Indian Ocean 's drainage basin also comprises about 13% of Earth's land. It drains

3708-700: The Northern Territory Legislative Council . It also produces the Northern Territory of Australia Government Gazette . The Northern Territory Legislative Council was the partly elected governing body from 1947 until its replacement by the fully elected Northern Territory Legislative Assembly in 1974. The total enrolment for the 1947 election was 4,443. The Northern Territory was split into five electorates: Darwin, Alice Springs, Tennant Creek, Batchelor, and Stuart. While this assembly exercises powers similar to those of

3811-524: The Port of Darwin was the major Territory supply for many decades. A railway was built between Palmerston and Pine Creek between 1883 and 1889 as part of the North Australia Railway . The economic pattern of cattle raising and mining was established so that by 1911 there were 513,000 cattle. Victoria River Downs Station , 686 kilometres (426 mi) west of Darwin, was at one time

3914-593: The Stuart Highway , known to locals simply as "the track". The Territory is home to many spectacular natural rock formations, including Uluru / Ayers Rock and Kata Tjuta / The Olgas in the Central Australian region and Kakadu National Park in the north. Each of these sites are sacred to the local Aboriginal people and which have become major International tourist attractions and recognised UNESCO World Heritage sites . The northern portion of

4017-423: The gross state product , or $ 5.68 billion, accounting for 92.4% of exports. The Territory's population is concentrated in coastal regions and along the Stuart Highway . Besides the capital of Darwin, the major settlements are (in order of size) Palmerston , Alice Springs , Katherine , Nhulunbuy and Tennant Creek . Residents of the Northern Territory are often known as "Territorians". Humans have lived in

4120-415: The groundwater . A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. Northern Territory The Northern Territory (abbreviated as NT ; known formally as the Northern Territory of Australia and informally as the Territory ) is an Australian internal territory in

4223-456: The " Unpromised Land ". During the early 20th century, the southern part of the Territory was considered the "last frontier" of Australian settlement, where 'sympathetic whites' hoped that Aboriginal traditions would continue to be practised. Conflicts arose due to the resource scarcity and the fragility of the cattle industry and the area was rife with Indigenous 'bush bandits' who speared cattle for food for want of employment by ranchers. This

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4326-521: The 1942 Japanese air raids. It was subsequently restored. In the late 1960s improved roads in adjoining States linking with the territory, port delays and rapid economic development led to uncertainty in port and regional infrastructure development. As a result of the Commission of Enquiry established by the Administrator, port working arrangements were changed, berth investment deferred and

4429-463: The 2010s interest in various updated or amended Bradfield schemes have increased among various politicians. Other less-developed diversion schemes have been proposed to divert river or sea water into the Lake Eyre Basin from time to time. 25°59′49″S 137°59′57″E  /  25.99686697°S 137.99905382°E  / -25.99686697; 137.99905382 Drainage basin Other terms for

4532-455: The 47,000 inhabitants of the city homeless. The city was rebuilt with much-improved construction codes and is a modern, landscaped metropolis today. In 1978 the Territory was granted Self Government with a Legislative Assembly headed by a Chief Minister . The Administrator of the Northern Territory is another important position in the government and they act as the King's representative in

4635-596: The Indigenous peoples. There is significant evidence of contact with Makassan fishers in examples of Indigenous Australian rock art and bark painting of northern Australia, with the Makassan perahu a prominent feature. With the coming of the British, there were four early attempts to settle the harsh environment of the northern coast, of which three failed in starvation and despair. The land now occupied by

4738-631: The Lake Eyre Basin Intergovernmental Agreement was signed, and the Lake Eyre Basin Intergovernmental Agreement was set up to ensure the sustainability of the Lake Eyre Basin river systems, particularly to avoid or eliminate cross-border impacts. The Lake Eyre Basin Ministerial Forum was established as the decision making body responsible for overseeing of the Agreement. The Ministerial Forum created

4841-471: The Lake Eyre Basin Intergovernmental Agreement was signed, which was set up to ensure the sustainability of the Lake Eyre Basin river systems. In 2014, the Queensland Government changed the laws protecting the rivers and floodplains. As of 2022 there are fears that mining for coal seam gas could be very detrimental to the fragile environment of the floodplains. The basin began to form in

4944-548: The Lake Eyre Basin river systems, however, Cooper Creek is by far the most famous, in particular because it was along Cooper Creek that the explorers Burke and Wills met their deaths. It rises in the form of two central Queensland rivers, the Thomson between Longreach and Charters Towers , and the Barcoo in the area around Barcaldine , about 500 kilometres (310 mi) inland from Rockhampton . Cooper Creek spreads out into

5047-403: The Lake Eyre Basin was well supplied with water and largely forested . About 20 million years ago, large shallow lakes formed, covering much of the area for about 10 million years. From that time on, as Australia drifted further north and the climate became gradually more arid, the lakes and floodplains started to dry. Only in the last 2.6 million years did the onset of the ice ages bring about

5150-820: The NT include the Northern Territory Greens , the Shooters and Fishers Party and various others. It is common for independent politicians to win elections. The CLP's rule was once so tight, that a former minister once said the CLP had a "'rightful inheritance of being the party that runs this place'". The Northern Territory is the only branch of the Australian Greens to have never had any parliamentary representation as of 2024. As fewer parties and candidates contest Northern Territory general elections than they do Australian federal elections in

5253-555: The Northern Territory are groups of Aboriginal landowners, set up under the Aboriginal Land Rights Act 1976 . The two historically dominant political parties in the Northern Territory are the conservative Country Liberal Party which governed the Territory from 1974 to 2001, from 2012 to 2016 and Since 2024, and the social-democratic Australian Labor Party which governed the Territory from 2001 to 2012 and from 2016 to 2024. Minor parties that are also active in

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5356-528: The Northern Territory was briefly one of the few places in the world with legal voluntary euthanasia , until the Federal Parliament overturned the legislation . Before the over-riding legislation was enacted, four people used the law supported by Dr Philip Nitschke . There are many very small settlements scattered across the Territory, but the larger population centres are located on the single paved road that links Darwin to southern Australia,

5459-480: The Northern Territory was part of colonial New South Wales from 1825 to 1863, except for a brief time from February to December 1846, when it was part of the short-lived colony of North Australia . The Northern Territory was part of South Australia from 1863 to 1911 and, under their administration the Overland Telegraph Line was constructed between 1870 and 1872. From its establishment in 1869

5562-453: The Northern Territory, the CLP, Labor and independents usually have a higher vote share at territory elections than at federal elections in the Northern Territory due to the absence of right-wing minor parties such as Pauline Hanson's One Nation and the fact that the Greens do not run in every seat at territory elections. The population of the Northern Territory at the 2011 Australian census

5665-586: The Northern Territory-Queensland border, north-west of Mount Isa and not far south of the Gulf of Carpentaria . In this relatively humid northern area, rainfall can be as high as 500 millimetres (20 in) per year and evaporation as low as 2.4 metres (7 ft 10 in). The Georgina flows through innumerable channels leading south through far-western Queensland for over 1,000 kilometres (620 mi), eventually reaching Goyder Lagoon in

5768-562: The Territory and a part of their role is appointing the Chief Minister. The Territory also publishes official notices in its own Government Gazette . In the 1980s, conservation-oriented areas in the Northern Territory such as Kakadu National Park and Uluru-Kata Tjuta National Park were inscribed on the UNESCO World Heritage List for their mix of natural heritage and Aboriginal culture. During 1995–96

5871-556: The Territory is principally tropical savannas , composed of several distinct ecoregions – Arnhem Land tropical savanna , Carpentaria tropical savanna , Kimberley tropical savanna , Victoria Plains tropical savanna , and Mitchell Grass Downs . The southern portion of the Territory is covered in deserts and xeric shrublands , including the Great Sandy-Tanami desert , Simpson Desert , and Central Ranges xeric scrub . There are also an extensive series of river systems in

5974-479: The Territory's population. The largest inland settlement is Alice Springs with a population of about 25,000 people. The archaeological history of the Northern Territory may have begun more than 60,000 years ago when humans first settled this region of the Sahul Continent. From at least the 18th century, Makassan traders began a relationship with the indigenous people of the Northern Territory around

6077-583: The Territory. These rivers include: the Alligator Rivers , Daly River , Finke River , McArthur River , Roper River , Todd River and Victoria River . The Hay River is a river south-west of Alice Springs, with the Marshall River, Arthur Creek, Camel Creek and Bore Creek flowing into it. The Northern Territory has two distinctive climate zones. The northern end, including Darwin, has a tropical climate with high humidity and two seasons,

6180-417: The US, interstate compacts ) or other political entities in a particular drainage basin to manage the body or bodies of water into which it drains. Examples of such interstate compacts are the Great Lakes Commission and the Tahoe Regional Planning Agency . In hydrology , the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle . The process of finding

6283-404: The Woodward Royal Commission in February 1973, to enquire into how land rights might be achieved in the Northern Territory. Justice Woodward 's first report in July 1973 recommended that a Central Land Council and a Northern Land Council be established to present to him the views of Aboriginal people. A Land Rights Bill was drafted, and the Aboriginal Land Rights (Northern Territory) Act 1976

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6386-563: The basin as far south as Lake Eyre. In 2014, the Queensland Government changed the laws protecting the rivers and floodplains, which, according to environmentalists , could lead to shale gas mining or fracking in the area. As of 2022 there are fears that mining for coal seam gas could be very detrimental to the fragile environment of the floodplains. The Kati Thanda-Lake Eyre National Park , Strzelecki Regional Reserve , Witjira National Park , Sturt National Park , Diamantina National Park , and Simpson Desert National Park are among

6489-486: The basin have a low gradient, slow flow rate and a naturally turbid water quality. Several of the major Lake Eyre Basin river systems are well-known. Because the Lake Eyre Basin is almost flat, rivers flow slowly and frequently split up into floodplains or multiple braided channels. Water is lost to evaporation, to seepage , and in the many ephemeral wetland systems, with the result that downstream flows are typically smaller than upstream flows. Only in exceptional years

6592-473: The basin, including Sturt Stony Desert , Tirari Desert and the Strzelecki Desert , are most probably the southern hemisphere's largest source of airborne dust. A total of 27 individual species of fish are found in Lake Eyre basin, with 13 of them being endemic. The largest fish species is the Macquaria , reaching a maximum weight of about 3 kilograms (6.6 lb). Wangkangurru ( also known as Arabana/Wangkangurru, Wangganguru, Wanggangurru, Wongkangurru)

6695-406: The basin, it can form tributaries that change the structure of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns. Rain gauge data is used to measure total precipitation over

6798-428: The basin. The mining and petroleum industries account for the greatest economic activity in the Lake Eyre Basin. Opals , coal, phosphate , gypsum and uranium are also mined from the basin. In 2009, the Queensland Environmental Protection Agency confirmed that heavy metals from mining operations near Mount Isa had entered the upper reaches of the Georgina River. The spill has the potential to contaminate parts of

6901-446: The central and central-northern regions of Australia . The Northern Territory shares its borders with Western Australia to the west ( 129th meridian east ), South Australia to the south ( 26th parallel south ), and Queensland to the east ( 138th meridian east ). To the north, the Northern Territory looks out to the Timor Sea , the Arafura Sea and the Gulf of Carpentaria , including Western New Guinea and various other islands of

7004-448: The cycles of the land for thousands of years and traditional owners are protective of its natural systems. Management of the area has been problematic as it is covered by four different states' jurisdictions . As the ecological significance of the basin has become known and mismanagement of the Murray-Darling Basin became apparent during several drought cycles , it became clear that ongoing management issues had to be resolved. In 2001

7107-430: The discharge of water from a basin may be made by a stream gauge located at the basin's outlet. Depending on the conditions of the drainage basin, as rainfall occurs some of it seeps directly into the ground. This water will either remain underground, slowly making its way downhill and eventually reaching the basin, or it will permeate deeper into the soil and consolidate into groundwater aquifers. As water flows through

7210-441: The drainage area is dependent on the soil type. Certain soil types such as sandy soils are very free-draining, and rainfall on sandy soil is likely to be absorbed by the ground. However, soils containing clay can be almost impermeable and therefore rainfall on clay soils will run off and contribute to flood volumes. After prolonged rainfall even free-draining soils can become saturated , meaning that any further rainfall will reach

7313-642: The drainage basin to the mouth, and may accumulate there, disturbing the natural mineral balance. This can cause eutrophication where plant growth is accelerated by the additional material. Because drainage basins are coherent entities in a hydrological sense, it has become common to manage water resources on the basis of individual basins. In the U.S. state of Minnesota , governmental entities that perform this function are called " watershed districts ". In New Zealand, they are called catchment boards. Comparable community groups based in Ontario, Canada, are called conservation authorities . In North America, this function

7416-551: The early Paleogene (about 60 million years ago) when south-eastern South Australia started to sink and rivers began to deposit sediment into the large, shallow basin. A remnant of an old oceanic plate is currently sinking in the mantle beneath the basin. The suction effect of this sinking likely caused both the Lake Eyre Basin as well as the Murray-Darling basin to form. The basin is still gradually sinking, and still gradually accumulating sediment. For many millions of years,

7519-857: The eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf , the Indian subcontinent , Burma, and most parts of Australia . The five largest river basins (by area), from largest to smallest, are those of the Amazon (7 million km ), the Congo (4 million km ), the Nile (3.4 million km ), the Mississippi (3.22 million km ), and the Río de la Plata (3.17 million km ). The three rivers that drain

7622-473: The entire flow of the Murray-Darling would be insufficient to fill Lake Eyre, merely keeping pace with evaporation. (In contrast, the flow of the Mississippi could fill Lake Eyre in 22 days, that of the Amazon in just three days.) Other lakes in the basin include Lake Frome , Lake Yamma Yamma and Lake Hart . The basin is also one of the largest, least-developed arid zone basins with a high degree of variability anywhere. It supports about 60,000 people and

7725-435: The ground and along rivers it can pick up nutrients , sediment , and pollutants . With the water, they are transported towards the outlet of the basin, and can affect the ecological processes along the way as well as in the receiving water body . Modern use of artificial fertilizers , containing nitrogen (as nitrates ), phosphorus , and potassium , has affected the mouths of drainage basins. The minerals are carried by

7828-781: The ground at its terminus, the area can go by several names, such playa, salt flat, dry lake , or alkali sink . The largest endorheic basins are in Central Asia , including the Caspian Sea , the Aral Sea , and numerous smaller lakes. Other endorheic regions include the Great Basin in the United States, much of the Sahara Desert , the drainage basin of the Okavango River ( Kalahari Basin ), highlands near

7931-498: The lake 1,000 km away, which only fills occasionally. Management of the area has been problematic as it is covered by four different states' jurisdictions . As the ecological significance of the basin has become known and mismanagement of another Australian basin, the Murray-Darling Basin , became apparent during several drought cycles , it became clear that ongoing management issues had to be resolved. In 2001

8034-503: The largest cattle station in the world. Gold was found at Grove Hill in 1872 and at Pine Creek (in 1871), Brocks Creek, Burundi, and copper was found at Daly River . On 1 January 1911, a decade after Federation , the Northern Territory was separated from South Australia, alongside the Australian Capital Territory from NSW, and transferred to federal control. Alfred Deakin opined at this time "[t]o me

8137-421: The main rivers of the basin, Cooper Creek , Georgina River and Diamantina River southwards towards Kati Thanda-Lake Eyre , the country's lowest point at 16 metres (52 ft) below sea level. The water overflows the river banks, across the floodplains , filling waterholes and wetlands and carving new channels, giving rise to the name Channel Country . Most of the rain which falls in the north never reaches

8240-514: The most water, from most to least, are the Amazon, Ganges , and Congo rivers. Endorheic basin are inland basins that do not drain to an ocean. Endorheic basins cover around 18% of the Earth's land. Some endorheic basins drain to an Endorheic lake or Inland sea . Many of these lakes are ephemeral or vary dramatically in size depending on climate and inflow. If water evaporates or infiltrates into

8343-600: The murder of a dingo hunter, resulting in the deaths of dozens to hundreds of people of the Warlpiri , Anmatyerre , and Kaytetye groups. This was one of many massacres of Aboriginal people in the region. For more information see: List of massacres of Indigenous Australians . During World War II, most of the Top End was placed under military government. This is the only time since Federation that part of an Australian state or territory has been under military control. After

8446-634: The north-eastern corner of South Australia. Australia's early bush poets immortalised the Diamantina River , making it a symbol of the remote outback. It too rises in northern Queensland, roughly between Mount Isa and Winton , flowing 800 kilometres south and west through Birdsville and the Channel Country to join the Georgina at Goyder Lagoon (and then, if there is sufficient flow, down Warburton Creek towards Lake Eyre). Of all

8549-640: The parliaments of the states of Australia, it does so by legislated devolution of powers from the Commonwealth Government , rather than by any constitutional right. As such, the Commonwealth Government retains the right to legislate for the territory, including the power to override legislation passed by the Legislative Assembly. The Monarch is represented by the Administrator of the Northern Territory , who performs

8652-487: The preferred choice in 1913. However, the name change never went ahead. For a brief time between 1927 and 1931 the Northern Territory was divided into North Australia and Central Australia at the 20th parallel of South latitude . Soon after this time, parts of the Northern Territory were considered in the Kimberley Plan as a possible site for the establishment of a Jewish Homeland , understandably considered

8755-474: The present area of the Northern Territory since at least 48,400 to 68,700 years ago. From the 17th or 18th century CE onwards, traders from Sulawesi established extensive seasonal trade links with the Indigenous peoples of Kimberley region , the modern-day Northern Territory, and Arnhem Land . They collected trepang ( sea cucumber ) for Chinese markets and introduced several goods and technologies to

8858-414: The present climatic regime and the consequent fairly rapid desertification of the area. The basin covers just under one-sixth of all Australia and is the largest endorheic basin in Australia and amongst the largest in the world, covering about 1,200,000 square kilometres (463,323 sq mi), including much of inland Queensland , large portions of South Australia and the Northern Territory , and

8961-454: The question has been not so much commercial as national, first, second, third and last. Either we must accomplish the peopling of the northern territory or submit to its transfer to some other nation." In late 1912 there was growing sentiment that the name "Northern Territory" was unsatisfactory. The names "Kingsland" (after King George V and to correspond with Queensland ), "Centralia" and "Territoria" were proposed with Kingsland becoming

9064-418: The rainfall on the area of land included in its polygon. These polygons are made by drawing lines between gauges, then making perpendicular bisectors of those lines form the polygons. The isohyetal method involves contours of equal precipitation are drawn over the gauges on a map. Calculating the area between these curves and adding up the volume of water is time-consuming. Isochrone maps can be used to show

9167-631: The responsibility of the countries sharing it. Nile Basin Initiative , OMVS for Senegal River , Mekong River Commission are a few examples of arrangements involving management of shared river basins. Management of shared drainage basins is also seen as a way to build lasting peaceful relationships among countries. The catchment is the most significant factor determining the amount or likelihood of flooding . Catchment factors are: topography , shape, size, soil type, and land use (paved or roofed areas). Catchment topography and shape determine

9270-461: The river rather than being absorbed by the ground. If the surface is impermeable the precipitation will create surface run-off which will lead to higher risk of flooding; if the ground is permeable, the precipitation will infiltrate the soil. Land use can contribute to the volume of water reaching the river, in a similar way to clay soils. For example, rainfall on roofs, pavements , and roads will be collected by rivers with almost no absorption into

9373-503: The smallest proportion (5.7%) aged 65 and over. The median age of residents of the Northern Territory is 31 years, six years younger than the national median age. Indigenous Australians make up 30.3% of population and own some 49% of the land. The life expectancy of Aboriginal Australians is well below that of non-Indigenous Australians in the Northern Territory, a fact that is mirrored elsewhere in Australia. ABS statistics suggest that Indigenous Australians die about 11 years earlier than

9476-418: The speed with which the runoff reaches a river. A long thin catchment will take longer to drain than a circular catchment. Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin. Soil type will help determine how much water reaches the river. The runoff from

9579-641: The story is told that this happened once early in the 20th century. In extreme events, water from the Finke River flows into the Macumba River , which empties into Lake Eyre , a total distance from headwater streams of around 750 km (470 mi). Major tributaries include Ellery Creek, and the Palmer and Hugh Rivers. The Georgina River system originates on the Barkly Tableland , near

9682-566: The territory was 48.3 °C (118.9 °F) at Finke on 1 and 2 January 1960. The lowest temperature was −7.5 °C (18.5 °F) at Alice Springs on 17 July 1976. The Northern Territory Parliament is one of the three unicameral parliaments in the country. Based on the Westminster System , it consists of the Northern Territory Legislative Assembly which was created in 1974, replacing

9785-415: The time taken for rain to reach the river, while catchment size, soil type, and development determine the amount of water to reach the river. Generally, topography plays a big part in how fast runoff will reach a river. Rain that falls in steep mountainous areas will reach the primary river in the drainage basin faster than flat or lightly sloping areas (e.g., > 1% gradient). Shape will contribute to

9888-477: The time taken for runoff water within a drainage basin to reach a lake, reservoir or outlet, assuming constant and uniform effective rainfall. Drainage basins are the principal hydrologic unit considered in fluvial geomorphology . A drainage basin is the source for water and sediment that moves from higher elevation through the river system to lower elevations as they reshape the channel forms. Drainage basins are important in ecology . As water flows over

9991-458: The trading of trepang . The coast of the Territory was first seen by Europeans in the 17th century. The British were the first Europeans to attempt to settle the coastal regions. After three failed attempts to establish a settlement (1824–1828, 1838–1849, and 1864–1866), success was achieved in 1869 with the establishment of a settlement at Port Darwin . The economy is based largely on mining and petroleum, which during 2018–2019 contributed 23% of

10094-464: The war, control for the entire area was handed back to the Commonwealth. The Bombing of Darwin occurred on 19 February 1942. It was the largest single attack ever mounted by a foreign power on Australia. Evidence of Darwin's World War II history is found at a variety of preserved sites in and around the city, including ammunition bunkers, airstrips, oil tunnels and museums. The port was damaged in

10197-537: The water reaching Lake Eyre comes from the river systems of semi-arid inland Queensland, roughly 1,000 kilometres (620 mi) to the north. To provide a sense of scale, the Lake Eyre Basin is about the size of France, Germany and Italy combined. It is slightly larger than the Murray-Darling basin (which drains inland eastern Australia and is responsible for a large proportion of the continent's agricultural productivity ) but has vastly less water. Nevertheless,

10300-409: The wet (October to April) and dry season (May to September). During the dry season nearly every day is warm and sunny, and afternoon humidity averages around 30%. There is very little rainfall between May and September. In the coolest months of June and July, the daily minimum temperature may dip as low as 14 °C (57 °F), but very rarely lower, and frost has never been recorded. The wet season

10403-418: Was 211,945, a 10 per cent increase from the 2006 census. The Australian Bureau of Statistics estimated a June 2015 resident population of 244,300, taking into account residents overseas or interstate. The territory's population represents 1% of the total population of Australia. The Northern Territory's population is the youngest in Australia and has the largest proportion (23.2%) under 15 years of age and

10506-682: Was exacerbated by a drought between 1925 and 1929 that led to the deaths of 85 per cent of the children at the Hermannsburg Mission in Central Australia. In the meantime, white attitudes towards Aboriginal people were paternalistic, torn between the desire to help them in times of hunger and the fear of "pauperizing" them and reducing their incentives to work. In the 1928 Coniston massacre , punitive expeditions were carried out by white colonists led by Northern Territory Police constable William George Murray in response to

10609-566: Was passed by the Fraser government on 16 December 1976 and began operation on 26 January 1977). The Northern Territory Council for Aboriginal Rights was disestablished in 1976. In 1974, from Christmas Eve to Christmas Day, Darwin was devastated by tropical Cyclone Tracy . Cyclone Tracy killed 71 people, caused A$ 837 million in damage (approximately A$ 6.85 billion as of 2018 ) and destroyed more than 70 per cent of Darwin's buildings, including 80 per cent of houses. Tracy left more than 41,000 out of

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