Bushfire Hazard Assessment - 41 Picture Point Cres Carroll and Meyer · RAL22/0021

4.0      LOCAL HAZARD MAP
4.1      GENERAL
         The SPP reference documentation sets out the following methodology for preparing a Local
         Hazard Area Map:
         • Categorising the vegetation within the site in accordance with the vegetation hazard classes
            derived from QFES (2019)
         • Using the patch and corridor filtering process to remove narrow corridors and small patches
            of hazardous vegetation
         • Subdividing the identified vegetation hazard classes into bushfire hazard sub-units based on
            slope differences and vegetation hazard classes
         • Assigning SPP Potential Bushfire Intensity classes to the sub-units
         • Application of 100m Potential Impact Buffers to the amended sub-units to derive an overall
            Local Hazard Map.

4.2      PATCH AND CORRIDOR FILTERING
        Section 4.2.6 of Bushfire Resilient Communities (QFES (2019) outlines the patch and corridor
        filtering process to modify potential intensity of small patches and corridors (based on Leonard et.
        al. 2017). The process involves the following three stages:
        • Merging small patches of a single Vegetation Hazard Class less than 0.5 ha;
        • Merging small Vegetation Hazard Class patches between 0.5 and 1 ha with higher or moderate
             fuel loads (greater than 8 tonnes/ha); and
        • Removing narrow corridors of vegetation less than 50m wide through a process of patch
             erosion and dilation. These small patches are merged with surrounding vegetation by
             allocating a patch to the Vegetation Hazard Class that is most common to the patch boundary
             (Leonard et al., 2017).

4.3      CALCULATION OF POTENTIAL BUSHFIRE INTENSITY
         Potential Bushfire Intensity is calculated by inputting the site-specific input parameters discussed
         in Section 3.1 into the FLAMESOL computer model. FLAMESOL uses industry standard bushfire
         equations and allows numerous input variables to be adjusted including fuel loads, fire danger
         index, site slope and distance to vegetation.
         The table below details the Potential Bushfire Intensity classes and their corresponding potential
         fire-line intensity (KW/m) values as prescribed within Leonard et. al. 2017.

           POTENTIAL BUSHFIRE INTENSITY                        POTENTIAL FIRELINE INTENSITY

           Very High                                           >40,000 kW/m

           High                                                20,000-39,999 kW/m

           Medium                                              4,000 – 19,999 kW/m


5 April 2022                            Mr Kim Carroll and Mrs Heidi Meyer                           Page: 10
Job No. 21-046          Bushfire Hazard Assessment – 41 Picture Point Crescent, Noosa Heads