PA2906-Coastal Hazard Assessment-R1 · MCU21/0212

                                              Internal use only




         10 years of such a planning period, there is only a 10% probability of occurrence
         of the design storm. Thus, the risk of a storm breaching the entire erosion prone
         area at some time during the 100-year period will be significantly less than 63%.”

BMT (2018) adopted a combination of a 100-year ARI Storm Tide level and 100-year ARI significant wave
height as the design storm event for the reassessment of erosion prone areas with Noosa Shire Council.
It should be noted that the joint probability of a combined 100-year ARI storm tide and 100-year ARI
significant wave height is likely to greater than a 100-year ARI storm event. This combination of design
storm tide level and wave height will be adopted for the site-specific reassessment of the erosion prone
area reported herein.

An additional assessment of short-term erosion will be undertaken for a more extreme event to assess the
vulnerability of the proposed house and pool to assist with foundation design. The design parameters for
the assessment of the short-term beach erosion and scenarios are presented in Table 4.
Table 4 Design Storm Events for Short-term Beach Erosion Assessment


                                                                      Storm Event
                         Storm Component
                                                          100-year ARI      Extreme Event
                         Significant Wave Height               6.2m               6.2m
                         Storm Tide                        1.74m AHD          1.84m AHD
                         Sea Level Rise                          -                0.8m

Figure 16 and Table 5 present the results of the modelled storm erosion associated with the above 100-
year ARI design storm event. This shows storm erosion of 51 metres measured from HAT position on the
current beach profile (pre-storm profile) to the toe of the erosion scarp.




15 October 2021     66 SEAVIEW TERRACE, SUNSHINE BEACH                     PA2906-RHD-ZZ-XX-RP-Z-0001   23