Engineering geology and remedial works design, Brewery Creek Slide, Clyde Power Project, New Zealand

Remedial measures at the Brewery Creek Slide are part of works to stabilise a number of large schist landslides along the shores of Lake Dunstan, Clyde Power Project, New Zealand. Remedial measures for part of the slide comprise a low level pumped drainage drive/drillhole network in conjunction with a zoned earthfill blanket and grout curtain. The works were designed to, and have successfully, lowered and controlled groundwater at the toe of the slide. Comprehensive investigations provided data for geological and geohydrological models on which the design was based. The design was independent of model uncertainties yet enabled an area which developed adverse conditions during lake filling to be readily and successfully treated.