Reference Document - Bushfire attack level assessment repor (As Published)t · MCU25/0022

              6.3        Anticipated severity of bushfire attack

              The fuel values from Section 3 are applied along with the other inputs for calculating design fire parameters,
              summarised in Table 3 below.

                Fire Scenario Forest South west                   Fire Scenario Forest South west

                Method 2 AS3959-2018                              Method 1 AS3959-2018
                FDI 46                                            FDI 40
                [email protected]/17.2t/ha.                           Forest
                Effective Slope under vegetation 14⁰ Down         Effective Slope under vegetation >10 - 15˚ Down
                Fire Intensity (Byram, 1959)
                19 204kW/m (”MEDIUM”)

                Rate of Spread (Noble et al, 1980)
                2.16kph
                Flame Height (modified Mc Arthur V equation,
                NSW RFS 2001) 16.1m
                Flame Width 100m
                Elevation of Receiver 2.4m
                BAL FZ within 13m of intact unmanaged             BAL FZ within 19m of intact unmanaged
                vegetation                                        vegetation
                BAL 40 from 13 - <17m                             BAL 40 from 19 - <25m
                BAL 29 from 17 - <25m                             BAL 29 from 25 - <36m
                BAL 19 from 25 - <35m                             BAL 19 from 36 - <49m
                BAL 12.5 from 35 – 100m                           BAL 12.5 from 49 – 100m

              Table 3. Calculated values for potential bushfire characteristics, and methods used.

          Site specific fire modelling by Method 2 under AS3959-2018 predicts a worst case fire scenario that is less severe
          than Method 1 under this Standard, despite applying a more robust value for FDI.

          Projected fireline intensity is approximately 19 204 KW/m, equating to “MEDIUM” as indicated under latest
          State and Council bushfire hazard mapping. The assessment validates classification of the area as BPA with
          required compliance against AS3959-2018.

          The Radiant Heat Flux curves for this design fire are plotted in Figure 9.




               Report compiled by Bushfire Risk Reducers for Mr A. Wittaker, February 2023                          Page 15

Document Set ID: 24478325
                  23591412
Version: 1, Version Date: 19/01/2026
                          28/02/2025