The Mangatangi dam is Auckland’s largest water-storage dam. With a capacity of 39 million cubic metres, it supplies nearly a quarter of the city’s bulk water. Before it was built in 1977 the Mangatangi River, which is tributary to the Waikato River, was a popular angling spot, and in 1993 the dam’s owners (Watercare) agreed to restore trout fishing on a trial basis. This did not lead to a drop in water quality, and fishing was allowed to continue.
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GNS Science
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