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. The Rakaia River has a mean flow of 203m3/s and a mean annual seven-day low flow of 87m3/s. In the 1850s, European settlers named it the Cholmondeley River, but this name lapsed into disuse.DescriptionIt rises in the Southern Alps, travelling 150km in a generally easterly or southeasterly direction before entering the Pacific Ocean 50km 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, 20km 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 1.75km long. A second bridge, much shorter and less used, spans the Rakaia Gorge.The Central Plains Water Trust is proposing to take up to 40m3/s of water from the Rakaia River as part of the Central Plains Water enhancement scheme.
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