7. Attachment F - Bushfire Hazard Assessment

                                                            Bushfire Hazard Assessment and Management Plan




                     Table 3: Slope angles for assessable fire runs to the development site


     Slope location in
                                Max effective       Max site slope     Fire run in relation
 relation to development                                                                       Fire run scale
                               slope (degrees)        (degrees)         to development
           area


                                                                                                Short fire run
           East                      5.5                 7.27              Downslope
                                                                                                   (140m)


                                                                                                Short fire run
        South-east                   3.06                4.53              Downslope
                                                                                                   (140m)


                                                                                               Fully Developed
        North-east                   2.0                 5.8               Downslope
                                                                                                    Fire


                                                                                                Short fire run
        South-west                   9.5                 4.2               Downslope
                                                                                                   (150m)




3.1.4 Step 4 - Remodelling of Bushfire Hazard

Given that site-specific assessment determined that VHCs provided within the BPA – VHC – South east
Queensland spatial dataset do not entirely reflect the ground-truthed VHCs, remodelling of bushfire
hazard has undertaken to determine how the changes to VHCs and associated fuel loads affect potential
fireline intensity. Potential fireline intensity has been calculated in accordance with the method outlined
in Leonard et. al. (2014).

Potential fireline intensity (PFI) is a standard measure of the rate at which an advancing fire would
consume fuel energy per unit time per unit length of the fire front. This metric combines potential fuel
load (PFL), maximum landscape slope (slope) and fire weather severity (FFDI) to provide a potential
fireline intensity metric. The potential fireline intensity (PFI) is represented as the following equation:

PFI = 0.62 PFL2 x FFDI exp (0.069 x slope)

Where: PFI = Potential fire line intensity (kW/m), PFL = Potential fuel load (tonnes / ha), FFDI = Potential
severe fire weather (FFDI) and Slope = Max slope

Table 4 shows the potential fireline intensity ranges (in kilowatts per metre) and the corresponding
potential bushfire hazard classes.

                    Table 4: Potential fireline intensity ranges and bushfire hazard classes


                  Potential Fireline Intensity (kW/m)     Potential Bushfire Hazard Class

                             40,000+ kW/m                              Very high




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