Approvals Application Supporting Material · MCU26/0084

                                                Noosa Harbour & Las Rias Foreshore Management Works
                                                  OFFICIAL



2.2 Works Description
The proposed development relates to coastal protection measures associated with rock revetment wall
repairs and nourishment works. These measures will consist of the following:

1. Repair existing rock revetment wall with suitable material to restore its functionality.
    ­   This will entail the replacement of existing rock material and addition of new material based on
        the site conditions and engineering requirements.
2. Groyne and nourishment works
    ­   Construction and filling activities for three groynes. Filling of the groynes will require capital
        dredging from a sandbank located below mean high water springs (MHWS) to source the
        material.
    ­   Beach nourishment activities for the placement of sand within the foreshore area.
These coastal protection measures are anticipated to reduce erosion risks by preserving the foreshore
area and improve safety for its visitors. Note the works will not interfere with public access to the
foreshore area and will enhance the beach amenities.

A full detailed layout set for the nourishment works including cross sections for the proposed groynes
construction, rock repairs and beach profile are provided alongside this application.

2.2.1 Reconstruction of Revetment Wall
Based on an options assessment, the preferred approach to reestablishment of the existing revetment
wall will be a targeted replacement and repair along the most at risk portion of the wall, based on
complete reconstruction to a similar design. This will retain the same footprint and alignment of the
existing wall and provide a new design life of 25 years.

The reconstruction process will involve the partial removal of parts of the wall not meeting design
specifications. For these sections, the wall section will be removed, the ground levelled and the wall
reconstructed using a geotextile membrane, two layers of underlay small rock, and two rock armour
layers. Full design detail is provided at Annex A in the Basis of Design and in the accompanying design
pack.

Details on the construction methodology, rock sourcing and laydown/stockpiling areas is provided in
Section 2.3.2.

2.2.2 Groynes and Beach Nourishment                                                                               Commented [JV1]: @Daniel Wishaw / @Verity Taylor -
The construction of the three groynes will be comprised of 109 geotextile bags and an underlying                  can you please update the sand volumes and no.
                                                                                                                  geotextile bags in this section (29 was noted in previous
geosynthetic sand mattress per groyne. The groynes have an approximate design life of 25 years. The               text but isn’t a multiple of 3?). Please ensure distinction
proposed groynes are between nine and thirteen meters in length and are spaced at approximately                   between sand placed above and below MHWS
20m.The rationale for choosing geotextile groynes as opposed to rock structures was consistent with
groynes treatments implemented elsewhere in the immediate region (e.g. at Munna Point) and presents
a lower safety risk, noting there will still be public access along the Noosa foreshore.

The groyne installation will include partial profiling of the beach to achieve a uniform surface, followed
by laying of a geosynthetic sand mattress and then two to three layers of geotextile sand containers.
The sand containers will be filled on site using sand sourced from within the Noosa River, as described
in Section 2.3.3. The total volume of sand required to fill the bags will be 400m3. The length and width
of the groynes differ across the site based on the current beach width.



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