Gulliver, C.P. 1976 Rangipo headrace tunnel, interim report on tunnelling conditions. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 270 5 p.
Abstract: The purpose of this report is to comment on anticipated ground conditions for the Rangipo Headrace Tunnel based on tunnel excavation and geological investigations to date. An attempt has also been made to predict the groundwater profile along the route. (auth)