Paterson, B.R. 1971 Report on the fall in the Tawhitikuri heading of the Tawhitikuri-Wanganui tunnel. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 122 9 p.
Abstract: This report is intended to document the fall which took place in the Tawhitikuri-Wanganui Tunnel on April 27 1971. An attempt is made to outline the tunneling conditions that existed prior to the fall. For this purpose extensive use was made of the information recorded on the Ministry of Works Tunnel Overseers' records. A description of the fall is included and an outline of the prolonged remedial programme. The appropriate tunnel log is appended (100/W/17C, Sheet 7) which shows the geology of the tunnel in the vicinity of the fall. (auth)