2019-12-16 GC Agenda - Item 5 - Attachment 1 - Noosa Spit Shoreline Erosion Management Plan-Part 1

Noosa Spit SEMP Final Report                                                                             62
Shoreline Erosion Mitigation Options




4       Shoreline Erosion Mitigation Options
4.1     Introduction
        An initial rapid assessment of shoreline erosion management options was completed to inform the
        Noosa Spit SEMP. This work followed:

        • Conceptual options proposed by Council’s Project Control Group (PCG) (refer Attachment 1); and

        • A meeting with Sel Sultmann from the Department of Environment and Science (DES) held on
          Friday 2 August 2019. The conceptual options proposed by the PCG were discussed in the
          context of gaining approval for the proposed works.

        The shortlisted options were then considered in detail following a Multi-Criteria Analysis process and
        further engagement with the PCG. Where appropriate, The Model has been used to test the
        effectiveness of the shortlisted options.

        This Chapter presents the analysis of shoreline erosion managements options and justification for
        the preferred strategy.

4.2     Overview of Generic Options
        Management options presented here focus on reducing the rate of shoreline erosion at Dog Beach
        and to avoid a breakthrough of the Noosa Spit which provides sheltering to existing development.

        Coastal management options broadly fall within the categories of avoid, accommodate, accept for
        future development; and protect, accommodate, retreat for existing assets and development.

        For future development, the management approaches are:

        • Avoid the risk, by not permitting vulnerable developments in high risk areas (over the design life
          of the development);

        • Accommodate the risk by including provisions that reduce consequence of impacts (foundations,
          floor levels, etc.); and

        • Accept the risk where appropriate to the level of risk over the design life of the development.

        Planned development should generally adopt these principles to avoid creating new coastal
        management issues for Council.

        Existing assets and development are harder to manage as the value (e.g. open space) or built
        assets (e.g. urban area) are already in place, as is the case for the Noosa Spit and adjacent areas it
        protects. Options for management of existing assets include the following approaches:

        • Protect existing assets on the ground, whether important habitat, open space or development.
          Protection can be in the form of a hard structure or soft engineering measure, and can have offsite
          impacts;

        • Retreat is the ‘no defence’ approach that aims to preserve beach amenity by allowing natural
          recession of the shoreline. Retreat can involve relocating or sacrificing the asset when impacts
          occur; and




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