Lower Waitaki power investigations : geological conditions, Black Point to the Pacific coast

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Macfarlane, D.F. 1980 Lower Waitaki power investigations : geological conditions, Black Point to the Pacific coast. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 344 27 p.

Abstract: This report summarises the results of subsurface investigations in the Lower Waitaki Valley from Black Point to the coast. Previous reports (Mansergh, 1974; McLean, 1977; Macfarlane, 1977) have described geological conditions on the true right bank of the river between Waitaki Dam and Black Point. Left bank investigations west of Black Point will be reported separately. Subsurface investigations to establish geological conditions in the Lower Waitaki Valley were initiated in 1966, discontinued in 1969 and recommenced in 1974 with the establishment of an investigations unit at Duntroon. In mid-1977 exploratory drilling of the area downstream of Black Point commenced and the main investigations emphasis was placed on this area from October 1978 to April 1980. As there are no firm proposals for the hydro-electric development of the lower Waitaki, this report does not attempt to assess foundation conditions at specific powerhouse sites but provides general comment on the anticipated development as a series of low head stations interconnected by canal. At this stage mapping continues in terms of geological unit boundaries. It is intended that a future report will present a geotechnical map of the whole valley based on the results of drilling and more comprehensive material testing.