Brown, I.R. 1975 Mangatangi dam abutment mapping, 1974-1975 construction season. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 236 6 p.
Abstract: Parts of the Mangatangi dam abutments have been mapped at a scale of 1 inch to 10 feet, with special attention to the position, spacing and orientation of rock defects. The permeability and deformability of the abutments will be controlled by the defects described in this report. (auth)