Taking water from one catchment and feeding it into another is commonplace overseas, but relatively rare in New Zealand. The Tongariro power scheme is one example. It diverts the headwaters of several rivers through tunnels and canals, so they flow through the Tokaanu power station and into Lake Taupō. From there, the water flows though a series of dams along the Waikato River. Protests against the scheme by the Ngāti Tūwharetoa tribe and fishers in the 1960s were largely ignored by successive governments, which were keen to increase electricity generation.
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