2021-11-15 GC Agenda - Item 7 - Attachment 2 - Coastal Hazards Adaptation Plan with tracked changes

For this plan, a range of storm tides of differing magnitudes were modelled for each of the four
planning horizons. AsFigure 8 shows an example of storm tide extent, for the year 210019.
Additional images showing the 100-year Average Recurrence Interval (ARI) storm tide extent
across the entire coastal zone for other years can be found in Appendix 3. These map layers can
also be explored in greater detail using Council’s mapping website.

It is important to note that as a result of the topography of the lower Noosa River, the project found
that the area of land exposed to a major storm tide event is less than that which would be expected
to occur during a major catchment flood event following major rainfall.20. Figure 8 shows an
example of storm tide extent, for the year 2100. Additional images showing the 100 ARI storm tide
extent across the entire coastal zone for other years can be found in Appendix 3. These map
layers can also be explored in greater detail (including for other scales of storm tide event) using
Council’s mapping website Land use and infrastructure planning already considers this catchment
flooding21.




19 Hazard extent has been derived using methods described in Aurecon (2013: Sunshine Coast Storm Tide

Study – Storm Tide Definition, prepared for Sunshine Coast Regional Council) and Airborne Laser Scanning
data captured in 2010. Inundation depths are derived from water levels that do not include any freeboard
allowance.
20 As described in the 2016 flood study undertaken by Noosa Council.
21 As described in Noosa Council (2017)’s Noosa River Flood Study Upgrade.


Noosa Council – Coastal Hazards Adaptation Plan                                                 Page 28