24-01-2020 - Appeal No. 245 of 2019 - Final Order of Judge Rackemann · 51987.2951.01

McInnes Wilson Lawyers




   No. 42 Seaview Terrace

                                Horizontal extent of erosion (Case 1)




Image 2: Horizontal extent of erosion adopted in Case 1 (based on information from Omtrek Pty Ltd).



    6.2      Results
Limiting equilibrium theory indicates that FOS values of less than or equal to 1.0 result in failure. It is
generally recognised that long-term FOS values (e.g. over a project life) should be 1.5 or greater. Councils
normally require a minimum FOS of 1.5 or greater.
The modelling outputs are shown in Appendix B (Figures B1 to B4, representing Case 1 to Case 4,
respectively).
The results are summarised and discussed in Table 2 below.
It should be noted that the modelling results are based on the occurrence of the hypothetical storm and wave
scenario nominated by the coastal engineering experts.




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