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Coastal Adaptation Decision Framework for Port Phillip Bay: Mitigating Climate Risks and Flooding

The Port Phillip Bay Coastal Adaptation Decision Framework aims to develop a unified economic model for coastal flood mitigation, fostering collaboration among councils and agencies. Case studies from the City of Kingston, City of Melbourne, Mornington Peninsula Shire, and City of Port Phillip will test adaptation strategies. The framework utilizes current and projected data on sea-level rise and rainfall to assess flooding risks. By exploring adaptation pathways, it seeks to minimize impacts, provide cost-benefit analyses, and communicate findings through accessible online resources.

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Coastal Adaptation Decision Framework for Port Phillip Bay: Mitigating Climate Risks and Flooding

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  1. Climate risks and infrastructure interdependencies Port Phillip Bay Coastal Adaptation Decision Framework

  2. PPBCAP Framework • Develop an consistent and universally adopted economic model to be shared by all decision-making bodies with an interest in coastal flood mitigation. The shared research would give cost savings, the process of working together on the modelling would also unite the various governments and agencies. A framework and pathway for decision making and option selection could be created and shared.

  3. Case studies • Four municipalities offered five specific case-study sites to apply and test the thinking behind the project, which was developed by consultant economists and engineers AECOM. The councils were: City of Kingston, City of Melbourne, Mornington Peninsula Shire and City of Port Phillip. The partners included Melbourne Water, DEPI, DPCD and VCCAR

  4. Mapping • Model the extent of inundation hazard • Using current data (2011) and forecast for 2040, 2070 and 2100 using sea level rise, rainfall increases (up to 32%) and wind/wave setup modelling. • Use additional modelling where needed. Coastal inundation datasets - Future Coasts /Melbourne Water/council/ etc

  5. Purpose • Understand the net value of occupation in the hazard zone now. • Establish the cost of flooding using annual average damage (AAD) • Add the projections between 2010 to 2100 • Establish the Net value again of occupying the area

  6. Pathways • Look at adaptation options • Accommodate allow flooding but minimise impacts (policy changes, retrofit) • Moderate protection reduce impact of future flooding (detention, augmentation) • Major protection to eliminate future flooding to allow future use ( levee, seawalls, reefs)

  7. Determine the benefit – cost • Determine the benefit – cost ratio for the pathway options/combinations for 2040 and 2070 • Compare against the no adaptation approach • Determine most effective pathway

  8. Presentation of results • Use of a website to convey the messages • www.abm.org.au/adaptationproject • Use of simple mapping to convey the extent of flooding now and future with adaptation and without adaptation measures.

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