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Georgina River : ウィキペディア英語版
Georgina River

The Georgina River is the north-westernmost of the three major rivers of the Channel Country in Central West Queensland that flow in extremely wet years into Lake Eyre.
==Geography==
The river rises from several smaller streams over a wide area of northwestern Queensland and the eastern Northern Territory. These include the Burke River, flowing through the basin's major town of Boulia, the upper Georgina River itself rising in the Barkly Tableland north of Camooweal, the Ranken River rising in the extreme east of the Northern Territory beyond Tennant Creek, and the Sandover River. The Sandover, unlike all other tributaries of Lake Eyre, flows northwards from the Macdonnell Ranges to enter the Georgina in very wet years near Urandangi.
The basin of the Georgina totals around 232,000 km², or about the same size as the Australia state of Victoria, but because it is so arid, its mean annual flow is only about .〔Brown, John Alexander Henstridge; ''Australia's Surface Water Resources''; published 1983 by Australian Government Publication Service. ISBN 9780644026178〕 However, there is such extreme variation that – although streamgauging records are too poor to prove it conclusively – meteorological records leave no doubt that there have been many years of ''zero runoff'' in the entire basin (1905, 1928 and 1961 would without doubt fit into this category, and several others are likely to as well were decent data available), whilst in very wet years such as 1974, 1977 and 2000, runoff can be as high as or more.〔Allen, Robert J.; ''The Australasian Summer Monsoon, Teleconnections, and Flooding in the Lake Eyre Basin''; published 1985 by Royal Geographical Society of Australasia, S.A. Branch; ISBN 0-909112-09-6〕
Although a small part of the rugged Macdonnell Ranges drains into the Georgina, most of the catchment is a flat as the Diamantina, though low ranges are very prominent in the north-west of the basin. This western part of the basin has soils that are too infertile to provide nutritious fodder for cattle or sheep and a large proportion is an Aboriginal reserve. The eastern part of the Georgina catchment near Boulia is very similar to the Diamantina and Cooper basins, being flaw grassy plains with heavy cracking clay soils that are quite fertile and provide very good feed in wet years for livestock. The Lake Machattie Area is an important breeding site for waterbirds.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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