Client: Department of Local Government, Infrastructure and Planning (QLD) with stakeholders from four Local Government Areas and other agencies
The Brisbane River has a catchment area of over 13,600km2 with a long history of flooding. Following the devastation caused by the 1974 flood event, Wivenhoe Dam was constructed in the Brisbane catchment for the dual purpose of water supply and flood mitigation. The 2011, flood event peaked approximately 1 metre lower than the 1974 event in Brisbane City, but caused widespread property damage in the catchment. The Brisbane River Catchment Flood Study (Comprehensive Hydraulic Assessment) is a critical step towards developing a Strategic Floodplain Management Plan for the region. BMT delivered the hydraulic assessment component of the study.
Outcomes and Benefits
The Brisbane River Catchment Flood Study is the most detailed and comprehensive flood study undertaken in Australia, and potentially the world. The leading-edge hydraulic modelling (using BMT’s TUFLOW software) was successfully calibrated to thousands of flood marks and hydrographs. Due to the complexity of the physical system, methodologies developed for the study were innovative and more comprehensive than current standard practice. A Monte Carlo approach was used to account for the variability in flood producing factors in the catchment. The result is an integrated suite of hydraulic models, rigorous calibration to historical events, and modelling of a comprehensive range of design events to define flood behaviour. Outputs of the study will be used to inform the Strategic Floodplain Management Plan, also by BMT.
Services and Expertise Provided:
Recognising rapid urban growth in the Local Government Area, Moreton Bay Regional Council has identified the need to augment the Brendale Wastewater Treatment Plant (WWTP) to account for this future growth.
BMT was appointed to review the methodology and modelling to inform a Flood Risk Assessment in Essex. Following the review recommendations for any limitations of the Flood risk Assessment have been sent to the client in a technical note.
Surface water flood modelling study to determine baseline flood risk through a rural village which is located downstream of a proposed Power Company development site. The project determined the existing flood risk to inform the planning and DCO submission from the power company for a new windfarm substation connection for offshore turbines to the National Grid.
Environmental risk assessment of siltation dredging and dredge material management.