Hegan, B.D. 1981 Mohaka River power investigations : Raupunga damsite : preliminary engineering geological mapping and proposed investigations. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 353 8 p.
Abstract: Investigations to determine the hydro-electric generation potential from a series of stations on the Mohaka River commenced in January 1959 when a MWD investigation team, based in Napier, initiated a study of the river. However, due to a number of factors, the investigations were deferred and the investigation office closed in 1960. In 1968 Power Design Office, MWD, prepared an office assessment of the power potential of the Mohaka River using data from the 1959 study. From this assessment it was suggested that a development of a six-step cascade of dams, each of 70 m to 100 m height, between the Ripia confluence and the rail viaduct at Raupunga would be feasible. The current investigations, also planned by the Power Design Office MWD, are to initially concentrate on the three downstream sites identified in the 1968 study at distances of about 15 km (Raupunga) 43 km (Willow Flat) and 55 km (Te Hoe). This preliminary engineering geological report describes the Raupunga site and recommends a programme of further surface and subsurface investigations. (auth)