2021-11-15 GC Agenda - Item 7 - Attachment 1 - Coastal Hazards Adaptation Plan

            Noosa Shire Council



  Dune revegetation and management.                                Beach nourishment, dune augmentation
  This option includes revegetation and                            and management
  maintenance of at-risk dune areas, including                     This option involves a whole-of-beach
  weed and pest control and fencing. This                          management approach and includes repeated
  nature-based option is considered a preferred                    cycles of sand nourishment, dune building
  and feasible response for mitigating coastal                     and revegetation. Sand nourishment and dune
  erosion risks due to the relatively low cost, high               building requires a supply of additional sand
  community support, ease of implementation,                       to be added to the beach, in this case from an
  consistency with the current scenic amenity of                   offshore resource. Earthmoving equipment is
  Noosa’s coastline, and lack of adverse impacts.                  used to shape the beach and dunes prior to
  Importantly, this low-risk management response                   revegetation work.
  provides benefits by providing support for
                                                                   For Teewah Beach, this option is not considered
  existing beach uses (e.g. recreation), supporting
                                                                   feasible due to the high implementation costs
  ecological values (beach and dune ecosystems
                                                                   relative to the small number of properties affected
  and biodiversity), visual amenity, as well as
                                                                   by coastal erosion prior to 2100.
  offering some level of protection against the
  effects of a coastal erosion event. Ongoing                      For the area between Peregian Beach and
  efforts to support dune growth and recovery                      Sunshine Beach, the cost-benefit analysis found
  are expected to delay any potential damage to                    there is a positive Net Present Value of $239
  properties and assets by helping to preserve                     million for this option. The increase in benefits is
  the dune profile and stability for longer than if no             significant and is attributed to the high property
  management intervention were made.                               and asset values that exist along this stretch of
                                                                   beach that would benefit from this option, relative
  The cost-benefit analysis25 found there is a
                                                                   to the cost of implementation. As such, this option
  positive Net Present Value (NPV) of $63 million
                                                                   is considered a feasible option for implementation
  (m) for the area between Peregian Beach and
                                                                   in the areas of high erosion risk.
  Sunshine Beach, and $0.3m at Teewah. This is
  due to the very low costs of action and the short-               It is important to note, however, that the costs
  term benefits that the revegetation and dune                     associated with undertaking sand nourishment
  management would provide.                                        (approximately $220 million to 2100) are
                                                                   significant. There is also significant uncertainty
  While some amount of dune revegetation and
                                                                   regarding these costs due to the incomplete
  management is underway that has important
                                                                   information on a reliable sand supply. Council
  benefits in slowing erosion, this work needs
                                                                   will further investigate sand supply, costs and
  ongoing and enhanced resources and needs
                                                                   potential funding options.
  to involve larger sections of beach in order to
  mitigate projected increases in erosion risks. This
  management response is a critical and immediate
  priority for Council and the community in helping
  to build climate resilience.




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       Aither, 2020. Noosa Shire Council – Coastal Hazard Adaptation Plan Cost Benefit Analysis

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