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Grey River
The Grey River / Māwheranui is located in the northwest of the South Island of New Zealand. It rises in Lake Christabel, one of numerous small lakes on the western side of the Southern Alps,12 kilometres southwest of the Lewis Pass, and runs westward for 120 kilometres before draining into the Tasman Sea at Greymouth. The river was named by explorer Thomas Brunner in honour of New Zealand politician Sir George Grey. The official name of the river was changed to Grey River / Māwheranui in 1998 by way of the Ngai Tahu Claims Settlement Act 1998.〔(【引用サイトリンク】title=Ngai Tahu Claims Settlement Act 1998 )〕 The Maori name for the river system and surrounding area is Māwhera, with Māwheranui being distinguished from the northern branch Little Grey River / Māwheraiti.〔New Zealand 1:50000 Topographic Map Series sheet BT21 – Waiuta〕
Numerous small rivers are tributaries of the Grey, and several of them also drain lakes. Notable among these are the Ahaura River and the Arnold River, the latter of which is the outflow of Lake Brunner, the largest lake of the northwest South Island. A small hydroelectric station is located on the river 25 kilometres upstream from the mouth of the river.
The Grey River's mouth is protected by a large sandbar, Greymouth bar, which is a notorious danger to shipping.〔("Greymouth bar braved by experienced fisherman - Video" ), 3News, 19 January 19, 2011〕
Raw sewage is discharged into the Grey River after heavy rainfall. Historically, sewage and stormwater from Greymouth, Cobden and Blaketown were discharged without treatment directly into the Grey River. Changes to the Grey District Council's wastewater schemes provide separation and treatment for sewage, except during periods of high rainfall, such as spring, when the capacity of the sewage treatment is exceeded.
==References==
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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