Bushfire Hazard Assessment and Management Plan

                                                            Bushfire Hazard Assessment and Management Plan



Vegetation to the west and north is low hazard, managed vegetation, and is therefore excluded from
assessment.

                    Table 2: 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


                                                                                               Fully developed
           East                     21.3                 20.9               Downslope
                                                                                                     fire


                                                                                               Fully developed
   South & South-west               22.8                 19.3               Downslope
                                                                                                     fire




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

                    Table 3: Potential fireline intensity ranges and bushfire hazard classes


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

                             40,000+ kW/m                               Very high


                         20,000 – 40,000 kW/m                             High


                          4,000–20,000 kW/m                              Medium


                             0 – 4,000 kW/m                       Low/Not bushfire prone




                                                      PR22116_BHAMP_178 Davis Rd, Cootharaba                Page 18