2019-07-09 P&E Agenda - Item 10 - Attachment 1 - Coastal Hazards Risk, Vulnerability and Adaptation Assessment

Noosa Shire Council Coastal Hazard Mapping                                                                3
Background




         (1)    Developing storm tide hazard mapping for the planning horizons of interest

         (2)    Coastal erosion prone area assessment and mapping

         The planning horizons agreed for the Noosa CHAP are present-day, 2040, 2070 and 2100 and
         therefore hazard mapping representative of these years is required. The CHAP adopts the 100
         year Average Recurrence Interval (ARI) as the base planning horizon for land use planning
         decision making, consistent with Queensland Government approach to assessing future climate
         coastal hazards. It is noted that climate change considerations for coastal engineering design
         should follow best practice guidelines (e.g. Harper 2012, 2017) and relevant standards and in some
         cases may require consideration of different planning horizons, likelihoods and climate change
         assumptions for internal purposes and progressive planning, therefore additional hazard maps
         have been produced.

         The Queensland Flood Commission of Inquiry for the Brisbane floods recommended consideration
         be given to a wide range of flood severities up to the probable maximum flood for considering flood
         risk. A similar approach has been undertaken for the CHAP, with a range of coastal hazard event
         probabilities being modelled. However to ensure this report remains concise, only the 1% AEP
         (approximately 100 ARI) are discussed.

         The assessments and methods for developing the necessary mapping products for the Noosa
         CHAP are described in Chapter 2 and Chapter 3 of this report. Plans illustrating the coastal hazard
         mapping results are presented in the Appendices.




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