Bushfire Report

                         Ecological Natural Area Management


7.2       Modelled bushfire attacks
Two bushfire attacks were modelled using Method 2 of Australian Standard AS 3959: Construction
of buildings in bushfire-prone areas. Bushfire attack parameter attenuation was included in the
bushfire attack modelling due to:
      •    Constrained fire runs from fragmentation of the vegetation due to residential development.
           (A short fire run can be used to attenuate bushfire attack parameters as it has been shown
           that it takes a period of time and therefore a fire run distance for a bushfire to reach it full
           quasi-steady state rate of spread (Cheney and Gould, 1997). The effect of a reduced
           bushfire forward rate of spread on the reduction of assessed bushfire attack parameters
           was modelled using the method of Tan (2006).




Figure 10: Map showing the modelled bushfire attacks


7.3       Assessment of fuel loads
The fuel loads used were the “Rainforest” fuel loads from Australian Standard AS 3959 of 10 t/ha
surface fuel and 12 t/ha total fuel.
7.4       Forest Fire Danger Index
This report will use the specified Forest Fire Danger Index of FFDI 52. as required by Bushfire
Resilient Communities - Technical Reference Guide for the State Planning Policy State Interest
‘Natural Hazards, Risk and Resilience – Bushfire (QFES, 2019).
7.5       Parameters used in the bushfire behaviour modelling
South bushfire attack
This modelled fire burns up-slope through Notophyll Vine Forest to attack from the south.
   • Fuel loads used are the “Rainforest” fuel loads of Australian Standard AS3959 of 10t/ha
      surface fuel & 125t/ha total fuel.
   • Separation of the house from the hazard: 30m
   • Slope in the vegetation = 13.70
   • Site slope = 10.70




Bushfire Risk Assessment and Management Plan for a house at 411 Black Pinch Rd, Cootharaba     December 2021

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