Country:	New Zealand
Key Area:	Water
Services:	Civil Engineering,Environmental Planning,Geotechnical Engineering,Water Resource Management

The Mt Grand Raw Water Reservoir provides security for the substantial portion of Dunedin City’s water supply that is supplied from the Mt Grand Water Treatment Plant. Raw water is conveyed to the Mt Grand site via long vulnerable pipelines from the Deep Stream and Deep Creek catchments. Potential damage to these pipelines, and the resultant loss of supply, previously posed a serious risk to the city.

Opus provided technical support to Dunedin City Council through the investigation and consenting processes, detailed design and construction management, monitoring and commissioning of the reservoir construction.

The project required creative solutions to the challenges presented by the site in terms of its location and topography, the area available, the local geology, maximising use of local materials and the rigorous high potential hazard management standards required for such a construction in an urban environment.

Located on the top of a water reservoir ‘mountain’, this structure is the largest geosynthetically-lined reservoir in New Zealand.  Earthworks for this structure were challenging both because of the location and the soft ground in the area.  The structure was commissioned in 2006.

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