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

                                                              Noosa Coastal Hazards Adaptation Plan



of the area between Peregian and Sunshine Beach would provide a net benefit, however, its
effectiveness is not expected to continue beyond the year 2070. In addition, there are material
uncertainties regarding a reliable long-term sand supply in the nearshore and offshore environment
(i.e. adjacent to these localities). The analysis undertaken for the sand nourishment option assumed
this sediment would remain available until the end of the planning period (2100).
The analysis demonstrates that the construction of hard-engineered revetment walls would be
unviable as it is unable to demonstrate sufficient public benefit to justify the economic, social and
environmental costs involved. This option is therefore considered not feasible from a socio-economic
perspective.

Acquisition of private residential properties (Option is deemed not feasible)
This option looked at what opportunities could be available for Council to acquire properties
impacted by coastal erosion. This also included options for temporary lease back to the property
owners. The cost benefit analysis demonstrated that this option does not deliver sufficient benefits
and therefore is not feasible for further consideration for any of the localities.
Fact sheets about the adaptation options subject to a cost-benefit analysis, including those described
above, can be found on the project page on Your Say Noosa.


Options for responding to coastal inundation risks
Water levels in the lower Noosa River and its tributaries (including the lakes) can become elevated
due to a number of factors including rainfall across the catchment area, a storm tide, or during sunny
days as a result of higher-than-average tides. The area of land subject to the effects of storm tides
is expected to increase as a result of sea level rise. In addition, the reach of tidal waters is going to
increase beyond what we currently identify as the shoreline and this is also due to increases in sea
level.
Flood management measures are currently in place in Noosa Shire to help manage the risks of
flooding as a result of high rainfall in the catchment (referred to as catchment flooding). These
include:
    • stormwater drainage works and flood mitigation works in high-risk flood prone areas
    •	planning controls through the Noosa Plan 2020 that set development requirements such as
       minimum levels for new buildings and filling limits for land subdivisions and other works
    • flood modelling and mapping identifying areas at risk for different flood severities
    • Disaster management responses during major flood events.
These catchment flooding measures will also help Noosa manage and adapt to changes to storm tide
inundation. For example, the minimum floor levels for new houses or units in Noosaville will ensure that
these developments are safeguarded from direct physical damage from storm tide inundation.




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