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

The Rakaia River is in the Canterbury Plains in New Zealand's South Island. The Rakaia River is one of the largest braided rivers in New Zealand.〔Morland, K. 1994: Water Resources of the Canterbury Region. Canterbury Regional Council Unpublished Technical Report U94/59.〕 The Rakaia River has a mean flow of and a mean annual seven-day low flow of .〔Morgan, M., Bidwell, V., Bright, J., McIndoe, I, and Robb, C. (2002): (''Canterbury Strategic Water Study'' ), Lincoln Environmental Report No 4557/1, Lincoln University, New Zealand. Table 6.1.〕 In the 1850s, European settlers named it the ''Cholmondeley River'', but this name lapsed into disuse.〔('Rivers Revert' ), John Wilson. 'Canterbury', Te Ara - the Encyclopedia of New Zealand, updated 19-Sep-2007 URL: http://www.TeAra.govt.nz/Places/Canterbury/Canterbury/en, retrieved 30 June 2008.〕
==Description==
It rises in the Southern Alps, travelling in a generally easterly or southeasterly direction before entering the Pacific Ocean south of Christchurch. As it reaches the river-coast interface; a hapua forms.
For much of its journey, the river is a braided river, running through a wide shingle bed. Close to Mount Hutt, however, it is briefly confined to a narrow canyon known as the Rakaia Gorge.
The Rakaia River is bridged in two places. The busiest crossing is at the small town of Rakaia, from the river mouth, where State Highway 1 and the South Island Main Trunk Railway cross the river using separate bridges. These two bridges are New Zealand's longest road and rail bridges respectively, approximately long.〔''"The Rakaia River"'', Selwyn District Council, http://www.selwyn.govt.nz/background/rakaia.htm, retrieved 31 August 2007〕 A second bridge, much shorter and less used, spans the Rakaia Gorge.
The Central Plains Water Trust is proposing to take up to of water from the Rakaia River as part of the Central Plains Water enhancement scheme.〔(Central Plains Water Trust applications for resource consent ) Environment Canterbury Resource Consents webpage, retrieved 6 October 2007.〕
The Rakaia River is a celebrated Chinook salmon fishery.〔West I. F. and Goode,R. H. (1987) ''"Aerial counts of spawning chinook salmon (Oncorhynchus tshawytscha) on the Rakaia River system, Canterbury, New Zealand, 1973-76."'' New Zealand Journal of Marine and Freshwater Research, 1987, Vol. 21: 563-572.〕 It has been identified as an Important Bird Area by BirdLife International because it supports breeding colonies of the endangered black-billed gull. The river is also known for its large wrybill population which represents 73 percent of the total population. Other important bird species using the riverbed are black-fronted tern and banded dotterel.〔O’Donnell, C.F.J. (2000). The significance of river and open water habitats for indigenous birds in Canterbury, New Zealand, Environment Canterbury Unpublished Report U00/37.〕

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