SUPERSEDED Reference Document - MCU22/0202

                                                                               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




                                                                     PR22428_BHAMP_199 Beddington Road, Doonan             Page 16
Document Set ID: 22623753
Version: 1, Version Date: 17/10/2023