Sunshine Coast Extreme Flood Hazard Mapping

Filling a Knowledge Gap on Flood Severity in Rare Events

Sunshine Coast Queensland, Australia

Blake Boulton

Client
Sunshine Coast Regional Council (SCRC)
Location
Sunshine Coast - QLD
Scope
Use of existing hydraulic models to map extreme floods
Impact
Improve flood information during extreme events

To assess their residual risk above the floor planning level, Sunshine Coast Regional Council required floodplain hazard mapping for events larger than the 1% AEP event. The areas of interest included Noosa River, Paynter Creek, Petrie Creek and Eudlo Creek. Previously hazard mapping had only been produced for events up to the 1% AEP.

WMS updated existing hydrologic (XP-RAFTS) and 1D hydraulic (MIKE 11) models to remove instabilities and reflect present day modelling techniques. The updated models were used to map flood hazard within the areas of interest for a range of rare design events. The models were also used to inform Council’s Disaster Hub and formed the basis of future flood related projects in Council.