The headwaters of the Orongorongo and Wainuiomata rivers are a vital part of Wellington’s water supply. In the late 19th century a dam to supply Wellington was built on the upper Wainuiomata. By 1918 this was inadequate. To increase the supply, the headwaters of the Orongorongo were tunnelled to the Wainuiomata dam.
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Wellington City Archives
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