Mansergh, G.D. 1973 Mt Hutt and Rosehill dam sites - S82 - geological report no.2. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 159 18 p.
Abstract: The South Canterbury Catchment Board propose to build two flood detention dams at the foot of Mt Hutt and requested assistance from Geological Survey. A report (Mansergh January 1973) was written describing the geology of the sites and a programme of subsurface investigation was suggested. Six shafts were dug with a Poclain digger fitted with an hydraulic grab and three trenches were dug with the same machine fitted with a back-acter bucket. All nine holes were logged in situ and 3'' diameter standpipes were installed in the shafts for future water level observations before the shafts were back-filled. The logs of all nine holes are appended to this report. (auth)