Upper Waitaki power development scheme, Pukaki lake control, engineering geological completion report

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Read, S.A.L. 1976 Upper Waitaki power development scheme, Pukaki lake control, engineering geological completion report. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 268 53 p.

Abstract: This report presents the engineering geology for the Pukaki Lake Control structure which consists of a 350 ft high earth dam plus associated wing dams, upstream blankets, a concrete diversion culvert, canal intake and spillway structure. The outlet to Lake Pukaki is located at the snout of glaciers which advanced to that point between 17,000 an 14,000 years before present. These advances have resulted in a relatively complex site geology in which lower permeability glacial till and proglacial lake deposits overlie higher permeability ice contact and outwash gravel. An account is given of the investigation methods employed before and during construction, and a description is given of the foundation geology materials. Groundwater conditions and the effects of raising Lake Pukaki are also discussed. (auth)