Kawarau River power investigations : engineering geological feasibility study of the proposed KW35 to KW28/29 canal

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Macfarlane, D.F. 1985 Kawarau River power investigations : engineering geological feasibility study of the proposed KW35 to KW28/29 canal. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 390 41 p.

Abstract: An engineering geological feasibility assessment of a canal from an intake at KW35 to either a dropshaft at KW28 or a powerhouse at KW29 has been undertaken as an integral part of the investigation of hydro- electric power development proposals for the Kawarau River. The proposed canal would be in cut for its entire length, and would involve cuts up to nearly 50 m deep in bedrock schist. Potential design and construction problems have been considered in detail. The proposed canal route is located entirely within the lensoid zone of deformation associated with the Nevis-Cardrona Fault System at the Kawarau River. There is evidence for repeated Late Quaternary tectonic deformation along the western margin of the fault system. Possible effects of a nearby large magnitude earthquake on the proposed canal include ground rupture (most likely as minor secondary displacement), ground shaking, and induced batter instability