Rangipo dam, a completion report of geological investigations

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Paterson, B.R. 1977 Rangipo dam, a completion report of geological investigations. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 274 46 p.

Abstract: The Rangipo dam is being constructed on the Waikato River (1 km downstream of the Rangipo damsite at the Waihohonu River confluence, the Waikato River is renamed the Tongariro River) at the headwaters of the Rangipo project. Water from the Waikato River supplemented by flows from both Moawhango (part of the Tongariro Power Development) and Waihohonu diversions will be diverted by the structure into a headrace tunnel leading to an underground powerhouse. The water will then pass through a tailrace tunnel rejoining the Tongariro River at Waikato Falls, immediately upstream of Poutu intake. At this point the water is rediverted through a tunnel and canal system of the Tongariro Power Development. There have been several phases of the geological investigations for the Rangipo dam spanning a period of 8 years from 1967 to 1975. In this report results of the first final design investigations carried out in 1974-5 are presented, together with a summary of previous investigations. Two plans are appended: 1) 100/R/34 Rangipo Dam - Plan of Geological Investigations 2) 100/R/35 Rangipo Dam - Geological Cross Sections and geological logs of drillholes R101-R113, R122-R127, R317 and R320. (auth)