Geology along the upper Pisa Canal

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Thomson, R. 1977 Geology along the upper Pisa Canal. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 275 8 p.

Abstract: It is proposed to channel the water from the Upper Pisa Dam along a 4 km canal to a power house situated on the right bank of the Clutha River. The canal will traverse moderate to flat slopes and will be constructed by both cut and fill. Rock types mapped along the route include schist, fluvioglacial sediments, and minor ablation moraine. There are no known major defects within these lithologies that would adversely affect canal construction and influence of minor, local mass movement deposits would appear to be negligible. A series od seismic profiles from along the canal route have been compared with the geology as mapped from the surface exposures; inconsistencies have been noted. (auth)