Geology of Mangapapa hydro-electric scheme, Tauranga. Progress report no. 1

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Riddolls, B.W. 1971 Geology of Mangapapa hydro-electric scheme, Tauranga. Progress report no. 1. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 105 8 p. + 2 folded sheets

Abstract: The scheme involves the diversion of water from the headwaters of several rivers through five tunnels to a main reservoir, thence by tunnel and canal to the powerhouse. Difficulty has been experienced in operating the tunnelling machine, owing to the occurrence of hard layers within the ignimbrite succession. With the aid of continuously cored drillholes it should be possible to predict the presence of the harder ignimbrite more accurately. However, local irregularities may not always be detected. (auth)