A drainage basin is an extent of land where water from rain and melting snow or ice drains downhill into a body of water, such as a river, lake, reservoir, estuary, wetland, sea or ocean. The drainage basin includes both the streams and rivers that convey the water as well as the land surfaces from which water drains into those channels, and is separated from adjacent basins by a drainage divide.
Major drainage basins are coded by hierarchy within the National Catchment Boundaries (NCB) dataset, with primary drainage basins attributed Level 1 and smaller river catchment subdivisions attributed Level 2. Beyond that, minor river and creek watersheds are ranked by the Pfafstetter Coding System. This article deals with surface water rather than groundwater basins, such as the Great Artesian Basin.
Australia has twelve distinguished NCB Level 1 drainage divisions [1] or thirteen [2] after splitting the South East Coast division at the New South Wales–Victoria border as defined by the Australian Water Resources Assessment 2012, a hydrological survey conducted by the Bureau of Meteorology. [3] Runoff from these divisions generally flows into the Pacific Ocean, the Indian Ocean, the Southern Ocean and Lake Eyre.
The following is a list of river or island catchments that are subdivisions of the basin containing them. [1]
The Great Dividing Range, also known as the East Australian Cordillera or the Eastern Highlands, is a cordillera system in eastern Australia consisting of an expansive collection of mountain ranges, plateaus and rolling hills, that runs roughly parallel to the east coast of Australia and forms the fifth-longest land-based mountain chain in the world, and the longest entirely within a single country. It is mainland Australia's most substantial topographic feature and serves as the definitive watershed for the river systems in eastern Australia, hence the name.
The Fitzroy River is a river located in Central Queensland, Australia. Its catchment covers an area of 142,665 square kilometres (55,083 sq mi), making it the largest river catchment flowing to the eastern coast of Australia. It is also the largest river basin that discharges onto the Great Barrier Reef.
The Burdekin River is a river located in North and Far North Queensland, Australia. The river rises on the northern slopes of Boulder Mountain at Valley of Lagoons, part of the western slope of the Seaview Range, and flows into the Coral Sea at Upstart Bay over 200 kilometres (124 mi) to the southeast of the source, with a catchment area of approximately 130,000 square kilometres (50,000 sq mi). The Burdekin River is Australia's largest river by (peak) discharge volume.
The Condamine River, part of the Balonne catchment that is part of the Murray-Darling Basin, drains the northern portion of the Darling Downs, an area of sub-coastal southern Queensland, Australia. The river is approximately 500 kilometers (310 mi) long and rises on Mount Superbus, South East Queensland's highest peak, on the western slopes of the Great Dividing Range, approximately 100 kilometres (62 mi) from the east coast of Queensland, and then flows north west across the Darling Downs, then west. The Condamine River is a tributary of the Darling River.
The Lake Eyre basin 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 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 a large amount of wildlife, and has no major irrigation, diversions or flood-plain developments. Low density grazing is the major land use, occupying 82% of the total land within the basin.
The South Australian gulf drainage division is the area surrounding the Gulf St Vincent and Spencer Gulf and a sliver of country to the immediate north. It includes 75,000 square kilometres of mostly moderately flat territory, broken only by the Mount Lofty Ranges which reach 932 metres at their highest point. It is bounded by the Murray-Darling Basin to the east, the Lake Eyre Basin to the north, and the Western Plateau to the west.
The Cooper Creek is one of the most famous rivers in Australia because it was the site of the death of the explorers Burke and Wills in 1861. It is sometimes known as the Barcoo River from one of its tributaries and is one of three major Queensland river systems that flow into the Lake Eyre basin. The flow of the creek depends on monsoonal rains falling months earlier and many hundreds of kilometres away in eastern Queensland. It is 1,300 kilometres (810 mi) in length.
The Nerang River is a perennial river located in South East Queensland, Australia. Its catchment lies within the Gold Coast local government area and covers an area of 490 square kilometres (190 sq mi). The river is approximately 62 kilometres (39 mi) in length.
The Burnett River is a river located in the Wide Bay–Burnett and Central Queensland regions of Queensland, Australia.
The Thomson River is a perennial river that forms part of the Lake Eyre Basin, situated in the central west and western regions of Queensland, Australia. Much of the course of the river comprises a series of narrow channels synonymous with the Channel Country and the Galilee subregion.
The Stanley River is a perennial river located in the South East region of Queensland, Australia. A major tributary of the Brisbane River, the Stanley River valley extends roughly 35 kilometres (22 mi) westwards from the area south of Maleny, through Woodford to Kilcoy before veering southwards.
The Georgina River is the north-westernmost of the three major rivers of the Channel Country in Central West Queensland, that also flows through a portion of the Northern Territory, in central Australia. Part of the Lake Eyre basin, the Georgina flows in extremely wet years into Lake Eyre.
The north-east coast drainage division or north-east coast basin is the area of Queensland between the Great Dividing Range and the Pacific Ocean. It lies between Torres Strait and an arbitrary line drawn along the Queensland - New South Wales border. In the north it meets the Gulf of Carpentaria basin to its west while further south lies the Lake Eyre Basin and the Murray-Darling Basin. In the south the Australian south-east coast drainage division continues to the east of the Great Divide.
A hydrological code or hydrologic unit code is a sequence of numbers or letters that identify a hydrological feature like a river, river reach, lake, or area like a drainage basin or catchment.
The Johnstone River, comprising the North Johnstone River and the South Johnstone River, is a river system located in Far North and North Queensland, Australia.
The Bulloo-Bancannia drainage basin or Cooper Creek–Bulloo River Basin is a Level 2 drainage basin that covers part of western Queensland and New South Wales. It was recognised by the Bureau of Meteorology and CSIRO as a subdivision of the Lake Eyre basin in the 2012 Australian Water Resources Assessment.
The Galilee Basin is a large inland geological basin in the western Queensland region of Australia. The Galilee Basin is part of a larger Carboniferous to Mid-Triassic basin system that contains the Cooper Basin, situated towards the south-west of the Galilee Basin, and the Bowen Basin to the east. The Galilee Basin covers a total area of approximately 247,000 square kilometres (95,000 sq mi). The basin is underlain by the Carboniferous Drummond Basin and overlain by the Cretaceous – Jurassic Eromanga Basin. The Triassic and younger sediments of the Galilee Basin form the basal sequence of the Great Artesian Basin drainage basin.
The Russell River is a river in Far North Queensland, Australia. The 59-kilometre (37 mi)-long river flows towards the Coral Sea and is located approximately 60 kilometres (37 mi) south of Cairns.
The Jackey Jackey Creek, also often called Jacky Jacky Creek, is a creek located in the Cape York Peninsula region of Far North Queensland, Australia.