Annex 10 - Code 8 - Coastal Development & Tidal Works

  Performance outcomes                                        Acceptable outcomes                                          Response
      3. coastal protection work or work necessary to
         protect coastal resources or coastal
         processes.

Table 8.2.3: Operational work which is not assessed by local government
  Performance outcomes                                        Acceptable outcomes                                          Response
  PO23 Works are located and designed such that they          AO23.1 Tidal work is designed and located in accordance      Complies with PO23
  continue to operate safely during and following a defined   with the Guideline: Building and engineering standards for
                                                                                                                           The works are designed in accordance with best
  storm tide event.                                           tidal works, Department of Environment and Heritage
                                                              Protection, 2017.                                            practice guidelines. Rock size and reef slopes have
                                                                                                                           been selected to be stable under their own weight
                                                                                                                           during and following a 50 year ARI design event.
                                                                                                                           Rock structures are inherently flexible and able to
                                                                                                                           accommodate some movement or displacement of
                                                                                                                           individual rocks, which may occur during a design
                                                                                                                           event. This is to be addressed through maintenance
                                                                                                                           if required in line with ICM drawing NROR-2021-00.

                                                                                                                           The oyster shell is not inherently stable in the design
                                                                                                                           site conditions, but shell stability has been optimised
                                                                                                                           by the use of whole shell, the mixing of shell with the
                                                                                                                           rocky substrate to secure it within the rocky matrix,
                                                                                                                           the placement of loose oyster cultch as a single layer
                                                                                                                           by hand into interstitial voids and the capping of the
                                                                                                                           volume of loose shell placed to 10kg/m3. Refer ICM
                                                                                                                           drawing NROR-2021-02 Notes 3 & 5 for placement
                                                                                                                           requirements. In the event that shell is displaced from
                                                                                                                           the structure, this will not compromise the ability of
                                                                                                                           the structure to operate safely and replacement shell
                                                                                                                           can be placed to enhance oyster recruitment. Where
                                                                                                                           monitoring identifies displaced shell that is more than
                                                                                                                           5m outside the Restoration Site, it is to be removed in
                                                                                                                           the event that it is resulting in negative impacts.
                                                                                                                           Refer ICM drawing NROR2021-00 Note 4.2 and
                                                                                                                           Project Restoration Plan. The risk of shell


State Development Assessment Provisions – version 2.6
State code 8: Coastal development and tidal works                                                                                                         Page 19 of 20