Appendix F - Bushfire Hazard Assessment & Management Plan

Bushfire Hazard Assessment & Management Plan v1                                  NCES REF: J000669
Lot 2 on RP131369 – 108 Black Mountain Range Road, Black Mountain




3.3 Quantitative Modelling
Quantitative modelling of the potential bushfire conditions that may be experienced within the
identified High Potential Bushfire Intensity Area associated with the VHC 9.1 open Eucalypt
forest to the west of the site has been undertaken to assist in determining the suitability of the
development and any asset setback requirements.
The models used comprise industry standard bushfire equations which have been built into
the FPAA endorsed FLAMESOL computer model. FLAMESOL allows numerous input
variables to be adjusted including fuel loads, fire danger index, site slope and distance to
vegetation. FLAMESOL uses the following algorithms:
    ·    Rate of Spread – McArthur (1973) and Nobel et al. (1980)
    ·    Flame Length – NSW Rural Fire Service (2001) and Nobel et al. (1980)
    ·    Elevation of Receiver – Douglas and Tan (2005)
    ·    Flame Angle – Douglas and Tan (2005)
    ·    Radian Heat Flux – Drysdale (1999), Sullivan et al. (2003) and Douglas and Tan (2005)
The FLAMESOL Minimum Distance calculator has been used and comprises an AS
3959:2018 Method 2 (Appendix B) based calculator which will determine standard bushfire
behaviour variables as well as the minimum distances required to achieve a range of different
radiant heat levels (represented by BAL's).
Fuel load inputs have been drawn from Planning for Bushfire Resilient Communities (QFES
2019) based on the calculated potential fuel loads for VHC 9.1 (21t/ha surface and near
surface fuels and 24.2t/ha total fuels). 12º effective slope was adopted for the slope underlying
the vegetation unit located within the 150m assessment area.
A Forest Fire Danger Index (FFDI) of 47 has been adopted for the site consistent with the
assignment by QFES (Catalyst 2020) (refer Plate 7).




                                    Plate 7 – FFDI (Source: QFES redi Map)

The Flamesol output results are shown in Plate 8.




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