ECM_22343537_v1_Coastal Hazard Assessment · 132000.200173.1

                                                          Internal use only




              7           Coastal Building Line
              Coastal building lines were introduced as a planning control by the former Beach Protection Authority
              under the provisions of the Beach Protection Act 1968 (repealed) and have been continued through
              transitional provisions in the Coastal Protection and Management Act 1995. The Coastal Building Line is
              an arbitrary line placed over properties with the intention to accommodate natural erosion and accretion
              processes associated with storm events (i.e. the short-term erosion component of the erosion prone area).

              Coastal Building Lines are declared under section 66 of the Coastal Protection and Management Act
              1995. The Coastal Building Line at 2 Arakoon Crescent is located 15 metres landward of the seaward
              property boundary (refer Figure 23). It is used as a development trigger under the Planning Act 2016 for
              assessment of building works within a Coastal Management District against the provisions of the State
              Development Assessment Provisions (SDAP).

              Performance Outcome PO6 of SDAP State Code 8 states, “In areas where a coastal building line is
              present, building work is located landward of the coastal building line unless coastal protection work has
              been constructed to protect the development”. The following points should be considered in the response
              to this performance outcome:
                       The assessment of erosion vulnerability presented in this report has been based on the ‘Coastal
                        Hazards Technical Guide’ (Department of Environment and Heritage Protection, 2013) to
                        calculated erosion prone area width for this site. The proposed building is located outside of the
                        calculated erosion prone area calculated herein.
                       An assessment of storm erosion associated with an extreme event consisting of a 500-year ARI
                        storm tide, 100-year ARI significant wave height and sea level rise of 0.8 metres, has also been
                        undertaken which indicated that the proposed house is not likely to be impacted by beach erosion
                        or slope instability under this scenario, based on present beach conditions.
                       The proposed building has been sited along the same alignment as the existing buildings on the
                        neighbouring properties to the north of the site (i.e. 4 Arakoon Crescent).

              This siting and design of the proposed house has considered the erosion vulnerability and is considered to
              comply with this Performance Outcome PO6 of SDAP State Code 8 as it achieves the protection required
              for the building from the storm events considered in Section 6.1.2.

              Figure 20 shows the extent of short-term erosion and dune scarp recession for an extreme storm event
              consisting of a 500-year ARI storm tide level, climate change induced sea level rise and a 100-year ARI
              significant wave height. The site is located outside of the zone that may be vulnerable to short-term
              erosion and as such it is unlikely that the coastal building line would have been applied to the site by the
              former Beach Protection Authority with the information currently available.




              13 February 2023         2 ARAKOON CRESCENT, SUNSHINE BEACH                            PA3303       33


Document Set ID: 22343537
Version: 1, Version Date: 16/03/2023