Appendix F - Flood Study

                                                                                                         Flood Study
                                                                                               Noosa Care - Carramar




Figure 5-2 Local and Regional 1% AEP Flood Extents with Climate Change

As shown in Figure 5-2, the regional model 1% AEP flood inundation extent matches well with the results of
the local flood model for the majority of the site. However, at the Cooroy-Noosa Road culvert outlet, there is
a steep rise in water levels in the regional flood model extent mapping. This is likely due to the performance
of this 1D structure in the regional hydraulic model and/or erroneous location of a model inflow, and is not
considered to be representative of the flood behaviour in this area. The more detailed local flood modelling
has demonstrated that the peak water levels downstream of the culvert outlet are not as variable. The regional
peak flood level of 8.3 mAHD at the northern boundary matches well with the results of the local flood
modelling. The proposed buildings are located 30 metres away from the area of flood level discrepancy.
The regional flood model levels at the comparison points in Figure 5-1 have been determined based on the
regional flood mapping and LiDAR data. An advanced flood search would be required to confirm these levels.
Error! Reference source not found. shows that the flood levels on this site are higher in the regional flood
model. At points A and B there is minimal difference between the regional and local flood models. However,
the regional flood model levels are higher at all points. Therefore, the minimum floor levels for this site will be
dictated by the regional flood model levels.

Table 5-4       Local and Regional Flood Model Results
                                       1% AEP Peak Water Level with Climate Change (mAHD)
  Comparison Point
                                 Regional Flood Model                           Local Flood Model
            A                              8.3                                         8.21
            B                              8.3                                         8.24
            C                              8.8                                         8.44
            D                              9.8                                         8.56


5.5             Minimum Floor Levels
The minimum floor levels to be adopted for the proposed development will be governed by the regional flood
model levels.




24 July 2017                                          Cardno                                                     14