Annex 10 - Code 8 - Coastal Development & Tidal Works

  Performance outcomes                                               Acceptable outcomes                    Response


  PO5 Development other than coastal protection work                 No acceptable outcome is prescribed.   Complies with PO5
  avoids directly or indirectly increasing the severity of coastal
                                                                                                            The works are not primarily for the purpose of coastal
  erosion either on or off the site.
                                                                                                            protection and have been designed to minimise the
                                                                                                            impacts to coastal processes where possible.
                                                                                                            However, particularly where erosion is a result of
                                                                                                            wave action or vessel wake, the reef patches would
                                                                                                            be expected to reduce the severity of coastal erosion.
                                                                                                            Erosion is not anticipated but will be monitored (see
                                                                                                            Restoration Plan. Section 8.4 Erosion control).

                                                                                                            Goat Island is largely sandy and located at the
                                                                                                            landward extent of a wide sandy bank. The section of
                                                                                                            shoreline selected for the works suffers from minor
                                                                                                            erosion that has resulted in no mangroves being
                                                                                                            present and the loss of mature vegetation. The
                                                                                                            landward row of reef patches is along the sandy
                                                                                                            foreshore but is approximately in line with the
                                                                                                            adjacent mangroves and the outer row of reef patches
                                                                                                            has been offset to avoid the potential for vessel wake
                                                                                                            to result in erosion between the inner reefs. As the
                                                                                                            reef patches are expected to dissipate wave energy /
                                                                                                            reduce vessel wake impacting on the shoreline, it
                                                                                                            would be expected to reduce the severity of erosion
                                                                                                            landward of the structures and it is hoped that this
                                                                                                            may promote the return of mangroves to this section
                                                                                                            of shoreline. The alignment and shape of the second
                                                                                                            row has been developed to minimise impacts to river
                                                                                                            flows and sediment transport to minimise any
                                                                                                            potential impacts to adjacent mangrove foreshores.

                                                                                                            Tewantin’s shoreline is dominated by mangroves and
                                                                                                            the seabed is largely characterised by rocky rubble.
                                                                                                            Sandy foreshores are limited to a short pocket beach.
                                                                                                            As such, there is no significant littoral transport and it
State Development Assessment Provisions – version 2.6
State code 8: Coastal development and tidal works                                                                                            Page 7 of 20