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

Noosa Spit SEMP Final Report                                                                                                                                                                                                                                                                                                                                                                                      69
Shoreline Erosion Mitigation Options




                                                                                                                                                                                                                                      Community Acceptability
                                                               Planning & Consultation




                                                                                                                                                                                                            Environmental or Social




                                                                                                                                                                                                                                                                                                                                                                 Score (Go = 1, Slow = 0,
                                                                                                                                                                                                                                                                                         Effectiveness over time
                                                                                                                                                                                                                                                                Reversible / Adaptable




                                                                                                                                                                                                                                                                                                                   Legal / Approval Risk
                                                                                         Treats Erosion Issue




                                                                                                                                                     Maintains Foreshore




                                                                                                                                                                                                                                                                                                                                           Technical Viability
                                                                                                                                                                                                                                                                                                                                                                                            Recommended




                                                                                                                Inundation Issue

                                                                                                                                   Maintains Beach




                                                                                                                                                                                          Recurrent Costs
                                                                                                                Treats Oceanic
Option                Option Type                                                                                                                                                                                                                                                                                                                                                           Asset Type &/or




                                                                                                                                                                           Capital Cost
                                                                                                                                                                                                                                                                                                                                                                                            Other Comments




                                                                                                                                                                                                                                                                                                                                                                 Stop = -1)
                                                                                                                                   Amenity


                                                                                                                                                     Habitat




                                                                                                                                                                                                            Impact
Protect - Regional Management Options
                      Stage 1 of the strategy was                                                                                                                                                                                                                                                                                                                                           The Stage 1 training wall
Full                  implemented and included                                                                                                                                                                                                                                                                                                                                              is performing as
                      construction of the training wall at
Implementation        the western end of Dog Beach and                                                                                                                       S               S                 S                           S                         S                        S                         S
                                                                                                                                                                                                                                                                                                                                                                                            intended however the
                                                                                                                                                                                                                                                                                                                                                                                            submerged structure
of Strategy           submerged structure.                                                                                                                                   t               t                 l                           l                         l                        l                         l                       G
                                                                                           ✓                    1/2                 ✓                                                                                                                                                                                                                               -1                      has been damaged by
Proposed by                                                                                                                                                                  o               o                 o                           o                         o                        o                         o                       o
                                                                                                                                                                                                                                                                                                                                                                                            propeller strike and is
                      Stage 2 of the strategy involves a                                                                                                                     p               p                 w                           w                         w                        w                         w
Sunshine Coast        significant extension of the                                                                                                                                                                                                                                                                                                                                          slumping. Scour is
Council               submerged structure and addition of                                                                                                                                                                                                                                                                                                                                   evident at both
                      two small groynes.                                                                                                                                                                                                                                                                                                                                                    structures.

                                                                                                                                                                                                                                                                                                                                                                                            The existing groyne
                                                                                                                                                                                                                                                                                                                                                                                            allows sand bypassing
                                                                                                                                                                                                                                                                                                                                                                                            and development of the
                      Extend existing structure to intercept                                                                                                                                                                                                                                                                                                                                southern spit (north of
Existing Groyne       sand and reduce bypassing of the                                                                                                                       S               S                 S                           S                          S                        S                        S                                                                   Dog Beach) which
Extension at          groyne into the river mouth.                                                                                                                           t               t                 l                           l                          t                        t                        l                       G
                                                                                         1/2                                                                                                                                                                                                                                                                        -3                      influences the entrance
Southern River                                                                                                                                                               o               o                 o                           o                          o                        o                        o                       o                                           channel alignment.
                      This option would potentially benefit                                                                                                                  p               p                 w                           w                          p                        p                        w
Mouth                 operation of the sand shifter.                                                                                                                                                                                                                                                                                                                                        Uncertainty whether a
                                                                                                                                                                                                                                                                                                                                                                                            reduced rate of
                                                                                                                                                                                                                                                                                                                                                                                            bypassing would benefit
                                                                                                                                                                                                                                                                                                                                                                                            Dog Beach.
                                                                                                                                                                                                                                                                                                                                                                                            The new structure is
                                                                                                                                                                                                                                                                                                                                                                                            intended to intercept
                                                                                                                                                                                                                                                                                                                                                                                            sand and reduce
                                                                                                                                                                             S               S                 S                           S                          S                        S                         S                      S                                           development of the
New Groyne at         New structure to intercept sand and                                                                                                                                                                                                                                                                                                                                   northern spit which
                                                                                                                                                                             t               t                 l                           l                          t                        t                         t                      l
Northern side of      reduce season transport into the                                   1/2
                                                                                                                                                                             o               o                 o                           o                          o                        o                         o                      o                   -5                      influences the entrance
River Mouth           river mouth from North Shore                                                                                                                                                                                                                                                                                                                                          channel alignment.
                                                                                                                                                                             p               p                 w                           w                          p                        p                         p                      w
                                                                                                                                                                                                                                                                                                                                                                                            Uncertainty whether
                                                                                                                                                                                                                                                                                                                                                                                            these works would
                                                                                                                                                                                                                                                                                                                                                                                            benefit Dog Beach.




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