Annex 10 - Code 8 - Coastal Development & Tidal Works

  Performance outcomes                                  Acceptable outcomes   Response
                                                                                 away from the shoreline reduces the potential for
                                                                                 focussing of tidal or flood flows. Tapering of the
                                                                                 reef ends reduces the potential for flow
                                                                                 disturbances (such as eddies) to develop.
                                                                                 Crest level – Crest levels are dictated by
                                                                                 desirable water depths for the target species and
                                                                                 do not extend above MHWS. As with many
                                                                                 natural oyster reefs, they are exposed during
                                                                                 lower tides and inundated during higher tides (or
                                                                                 flood events). When water levels are close to or
                                                                                 over the crest of the reef, wave action and vessel
                                                                                 wake would be expected to overtop the structure.
                                                                                 As such, wave energy reaching the shoreline
                                                                                 (especially for Layout 2 & 3) will be reduced but
                                                                                 not eliminated. While natural erosion may
                                                                                 continue to occur, it is expected to be reduced.
                                                                                 Access space – The provision of an access
                                                                                 space facilitates monitoring of the reef habitat, but
                                                                                 also provides space for natural flows to occur
                                                                                 between oyster reef patches.
                                                                                 Porous rock substrate – waves impacting with
                                                                                 the substrate are dissipated into the voids in the
                                                                                 substrate, with reduced wave energy impacting
                                                                                 on the adjacent shoreline and reduced wave
                                                                                 reflection compared with solid structures.
                                                                                Erosion is not anticipated but will be monitored
                                                                                (see Restoration Plan. Section 8.4 Erosion
                                                                                control).



State Development Assessment Provisions – version 2.6
State code 8: Coastal development and tidal works                                                            Page 4 of 20