Reference Document - 152000.200053.3 - Bushfire Fire Risk Assessment (As Published)

Bushfire Risk Assessment v3                                                       NCES REF: J001433
Select Areas of Noosa Springs Residential Estate, Noosa Heads




3.5       Quantitative Modelling
Quantitative modelling of the potential bushfire conditions that may be experienced within the
dominant vegetation hazard classes located adjacent to each of the 4 assessment areas has
been undertaken to assist in determining the attributable risk associated with each area.
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 calculates a range of bushfire behaviour outputs
including the minimum distances required to achieve a range of different radiant heat flux
thresholds. Fuel load inputs have been drawn from BRC 2019 based on the calculated potential
fuel loads for the relevant VHC. The output results are shown in Plates 17 -22.




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