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K. Chandler, D. Gill, B. Maher, S. Macnish and G. Roads
SEQWater is the major supplier of untreated water in bulk to Local Governments and industry in the South East Queensland region of Australia, through ownership of Wivenhoe, Somerset and North Pine Dams. Wivenhoe Dam (Lake Wivenhoe) is located on the Brisbane River in Esk Shire. The storage provides both flood mitigation and water supply storage to Brisbane and Ipswich. The water supply storage capacity at full supply level is 1,160 GL. An additional 1,450 GL of storage above full supply level is used for flood mitigation.
Changes to the estimation of extreme rainfall events has resulted in significant increases in the estimates of the PMF since the original design of Wivenhoe Dam. To upgrade the flood security of Wivenhoe Dam, SEQWater has formed an alliance with Leighton Contractors, Coffey Geosciences, MWH and the NSW Department of Commerce.
This paper details the alliance delivery method, the latest estimates of the PMF based on the GTSMR method and details of the two preferred options being finalised by the Alliance.Learn more
A. Ahmed-Zeki, G. Roads
South East Queensland Water Corporation (SEQWater) as owner and operator is proceeding with an upgrade of the flood capacity of Wivenhoe Dam. SEQWater has formed an Alliance with Leighton Contractors, Coffey Geosciences, Montgomery Watson Harza (MWH) and the Department of Commerce-NSW (formerly DPWS, NSW) to upgrade Wivenhoe Dam. This paper presents feasibility level investigation and design activities for an upgrade option, comprising a large labyrinth auxiliary spillway at the right abutment of the dam, for supplementing the existing gated spillway in handling the Probable Maximum Flood (PMF) event. This right abutment auxiliary spillway option incorporates Hydroplus type concrete fuse gates. The investigation so far has proved the technical viability of this option, however, ranking along with the other three options against various criteria will lead to the selection of the preferred upgrade option.Learn more
S.E. Macnish, B Maher2, D. Gill, N Bennett, N.Woods and K.F. Chandler
Wivenhoe Dam is being upgraded to safely manage any conceivable flood in response to a revision of rainfall predictions by the Bureau of Meteorology. These revisions have led to a substantial increase in estimates of the Probable Maximum Flood that the storage must be able to manage under the ANCOLD guidelines. Wivenhoe Dam, completed in 1985, is located about 80 km north west of Brisbane and is the major domestic water supply for South East Queensland.
The dam is owned and operated by SEQWater who are responsible also for North Pine and Somerset Dams. The upgrade is being undertaken as an Alliance contract with the member companies being SEQWater, Leighton Contractors, MWH, Department of Commerce NSW, and Coffey Geosciences. The upgrade involves construction of a second spillway, 165 m wide on the right abutment. This will be a fuse plug spillway requiring excavation of approximately 600,000 m3 of material.
Construction impacts on the community include noise and dust, blasting, and temporary road diversions/lane closures of the main Brisbane Valley Highway over about two years of construction.Learn more
This paper deals with a wide range of stakeholder, community consultation and environmental initiatives that have involved local residents, stakeholders and recreational users in the planning and implementation phases of this project. Several long-term environmental legacies are also discussed.
D. Gill, B. Cooper, B. Maher, S. Macnish and G. Roads
SEQWater is the major supplier of bulk water to Local Governments and industry in South
SEQWater owns Wivenhoe, Somerset and North Pine Dams. Wivenhoe
Dam (Lake Wivenhoe) is located on the Brisbane River in Esk Shire. The storage provides
both flood mitigation and water supply storage to Brisbane and Ipswich. The water supply
storage capacity at full supply level is 1,160 GL. An additional 1,450 GL of storage above full
supply level is used for flood mitigation.
Changes to the estimation of extreme rainfall events has resulted in significant increases in
the estimates of the PMF since the original design of Wivenhoe Dam. To upgrade the dam
SEQWater formed an Alliance with Leighton, Coffey, MWH and the NSW Department of
Commerce Dam & Civil Section.
A preferred upgrade option for Wivenhoe Dam has been selected, designed andLearn more
construction started by the Wivenhoe Alliance. This paper presents details of the selected upgrade option.