Annex 10 - Code 8 - Coastal Development & Tidal Works

  Performance outcomes                                  Acceptable outcomes   Response
                                                                                also detailed design requirements regarding
                                                                                application of these layouts to specific sites.
                                                                                Concept Layouts 2 & 3 have been adopted for
                                                                                Phase 1.
                                                                                Concept Layouts 2 & 3 (segmented longshore
                                                                                modules) have been designed to minimise impacts
                                                                                to littoral drift and coastal processes by being
                                                                                aligned with river flows and providing gaps
                                                                                between reef patches. Despite this, the reef
                                                                                patches are anticipated to act as a segmented reef
                                                                                and provide some sheltering to the shoreline from
                                                                                wave action and vessel wake and result in
                                                                                reduced erosion. Reef has been segmented to
                                                                                limit this impact and allow penetration of waves
                                                                                and flows without resulting in pockets of increased
                                                                                erosion.
                                                                                Concept layout 1 provides habitat that extends out
                                                                                perpendicular from the shore similar to observed
                                                                                development of oyster reef habitats. This layout is
                                                                                only suitable in locations with low sediment
                                                                                transport and not within Restoration Zone 1 Main
                                                                                Channel. In these locations there is limited risk of
                                                                                the works acting as a submerged groyne, which
                                                                                would have the potential to impact on littoral drift,
                                                                                erosion and accretion patterns (as well as result in
                                                                                undesirable burial of sections of the structure).
                                                                                 Potential impacts to coastal erosion have been
                                                                                 minimised through:
                                                                                 Site selection - has initially targeted sites within
                                                                                 the Main Channel that do not experience high

State Development Assessment Provisions – version 2.6
State code 8: Coastal development and tidal works                                                            Page 2 of 20