Kawarau power investigations : engineering geological investigations for the KW26 dam site

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Beetham, R.D. 1985 Kawarau power investigations : engineering geological investigations for the KW26 dam site. [s.l.]: [s.n.]. New Zealand Geological Survey report EG 394 23 p.

Abstract: The KW26 dam site is an important component of the Scheme G hydro development proposal for the Kawarau River. Although subsurface investigations were curtailed before completion, field studies suggest that geological conditions are favourable and the site suitable for construction of the concrete gravity dam and tunnel intake envisaged. Wide zones of sheared rock have been located up and downstream of the proposed site, which appears to be positioned in a 350 m wide area of relatively defect free rock. Some foundation ''dental'' work would be required in minor crush zones and in a deep gravel filled gut beneath the present river channel. A consolidation grouting programme would be required to ensure open joints in areas of relaxed rock on the steep banks are sealed. Should the site be considered desirable for hydro development at some stage in the future, a subsurface drilling programme should be reinstated. Some possible future drillhole locations are suggested. In addition, as the Scheme G development is dependent on the continuing stability of the Mt Malcolm landslide, future subsurface investigations should be directed towards this area.