Oborn, L.E.; Northey, R.D.; Beetham, R.D.; Brown, I.R. 1982 Preliminary report on engineering geology in the area of Ruahihi canal collapse. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 361. 8 p.
Abstract: This report is the partial fulfilment of a request by the Committee convened by the Commissioner of Works to enquire into the 20 September 1981 failure of the Ruahihi Canal. Field observations of the geology between canal stations 2500 and 3350m are presented, especially of the exposures in the chasm which resulted from the failure,