The reservoir was constructed in 1973 to 1978 by Brisbane City Council. The upgrade work will be the largest undertaken since its construction and will improve the long-term reliability of the larger of the two reservoirs on site.
Work will include improving the stability of the reservoir roof, redesigning and reinstalling the internal support columns and sealing the entire roof structure with a liquid membrane to better protect the stored drinking water.
During the upgrade, the smaller reservoir on site is being ramped up to provide the alternative supply.
Work is expected to be completed and the larger reservoir returned to service in the first half of 2020.