Bushfire Hazard Assessment - 11 Senegal Rise

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

Figures 5-7 are presented below and have been prepared as per the above referenced methodology.

19 July 2021                                        Chris Bentley                                    Page: 7
Job No. 20-052                  Bushfire Hazard Assessment – 11 Senegal Rise, Doonan