Annex 11 - Code 11 - Marine Plants

  Performance outcomes                              Acceptable outcomes   Response
  clearly and accurately identified and mapped to                         along the shoreline (concept layouts 2&3). For phase
  enable risks and impacts to be properly                                 1 works, no finer substrates are planned.
  assessed.
                                                                          The substrate patches prescribed for phase 1 are
                                                                          singular rows of large or small diameter patches, as
                                                                          applied at the Noosa Sound East restoration site, or
                                                                          multiple offset rows as prescribed for Noosa Sound
                                                                          West, Tewantin and Goat Island restoration sites.

                                                                          The designs and placement minimise interference
                                                                          with laminar river flow and reduce wave refraction
                                                                          potential. This is described in section 1.10 in the
                                                                          restoration plan.

                                                                          Even though the works are not intended to provide
                                                                          erosion protection, the nature of the works are
                                                                          generally expected to result in reduced severity of
                                                                          coastal erosion adjacent to the structures. The oyster
                                                                          reef patches in this project are engineered to reduce
                                                                          any potential for these structures to result in increased
                                                                          erosion of adjacent shorelines, including shorelines
                                                                          upstream and downstream of the works.

                                                                          Engineered design features which minimise the
                                                                          erosion potential of the oyster reef patches include:
                                                                          Segmented reef patches, which allow for current flow
                                                                          between patches.
                                                                          Shaped reef patches, which reduce impediments to
                                                                          current flow.
                                                                          Low crest height, allowing waves to reach the shore,
                                                                          but with reduced energy and thus reduced erosion
                                                                          potential.
                                                                          Porous rock substrate, which reduces wave energy
                                                                          around the patches. See Project Restoration Plan,
                                                                          Section 8.4. Erosion control for detailed explanation.

                                                                          Visual observations will be undertaken by the
                                                                          monitoring team every 6 months up to 100m
                                                                          upstream and downstream of the restoration site and
                                                                          any changes in shoreline profiles recorded. Every 12

State Development Assessment Provisions – version 2.6
State code 11: Removal, destruction or damage of marine plants                                            Page 4 of 24