Reference Document - Coastal Hazard Assessment - MCU24 0094 · MCU24/0094

                                       33 Ross Crescent, Sunshine Beach – Coastal Hazzard Assessment | 33 Ross Crescent Family Trust



TABLE 6.6: COMPARISON OF EROSION PRONE AREA CALCULATION PARAMETERS
 Parameter                               M&N (2025)               RHDHV (2024)                    BMT (2018) Assessment
 Location                              33 Ross Crescent       33 Ross Crescent                  ETA 596               ETA 602
 Storm tide (m AHD)                          1.79                      1.74                      2.20                  2.20
 Wave Height (m)                              6.2                      6.2                        6.2                   6.2
 Dune Height (m AHD)                           7                        7                         4.9                   4.9
 Depth of closure (m AHD)                     -12                      -12                       -11.5                 -11.5
 Active profile Height (m)                    19                       19                        16.9                  16.9
 Active beach width (m)                      600                       600                        525                   595
 Median sand size D50 (mm)                   0.22                      0.22                      0.22                  0.22


TABLE 6.7: COMPARISON OF EROSION PRONE AREA COMPONENTS AND WIDTH
 Assessment           Location            Long-term       Short-term         Recession due        Dune    Factor of      Erosion
                                          Recession        Erosion          to sea level rise     Scarp    safety       Prone Area
                                              (m)            (m)                  (m)              (m)      (m)               (m)
                                             NxR              C                    S                D        F                 E
 BMT (2018)           ETA 596                 10             21                    26              19        23                99
                      ETA 602                 10             52                    26              13        35               136
                      Sunshine Beach          10             37                    26              16        29               118
 RHDHV (2024)         33 Ross Ct              10             19                    25               8        23                84
 M&N (2025)           33 Ross Ct              10             20                    25               8        23                85



6.4.1.      Beach Profile
Beach environments are in dynamic equilibrium with the prevailing coastal processes and sediment supply
that results in the beach profile constantly changing in response to changes in conditions.

The beach profile adopted by BMT (2018) for ETA 602 is shown in Figure 6-9 and was derived from 2016
LiDAR data combined with the Sunshine Coast Bathymetric Lidar Data (2011) for the nearshore section.

The beach profile for this assessment (refer Figure 6-8) was based on detailed site survey (refer Appendix
C) combined with the Sunshine Coast Bathymetric Lidar Data for the nearshore section. The profiles are
different and this impacts on the extent of erosion that may occur during the adopted design storm event.




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