Approved Reference Documents - 132001.210127.3

Bushfire Hazard Assessment & Management Plan v2 NCES REF: J000542
Lot 9 on RP225312 — 100 Cooyar Street, Noosa Heads

4 BUSHFIRE RISK ASSESSMENT

4.1 Methodology

A bushfire risk assessment for the proposed building areas has been prepared generally in
accordance with State Planning Policy — State Interest Guideline — Natural Hazards, Risk and
Resilience (DILGP, 2016) and AS/NZS ISO 31000:2018 — Risk Management Methodology.

The bushfire risk assessment details the likelihood that the proposed development will be
exposed to radiant heat impact considering the proximity to bushfire prone vegetation and
likely bushfire behaviour. Plate 15 illustrates the main bushfire attack mechanisms acting on
buildings.

 

    
 

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Heat Radiation

 

 

 

 

  
 
      

 

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Wind, Smoke & Ember Attack

  

 

 

 

 

 

 

 

Plate 15 — Figure A 5.1 Bushfire attack mechanisms (Planning for Bush Fire Protection, 2006)

According to AS/NZS ISO 31000:2018, a ‘hazard’ is defined as a source of potential harm or
a situation with a potential to cause loss, whereas a ‘risk’ is the chance of something
happening that will have an impact on objectives measured in terms of consequences and
likelihood. The State Planning Policy — State Interest Guideline — Natural Hazards, Risk and
Resilience (DILGP, April 2016) refers to ‘acceptable risk’, ‘tolerable risk’, and ‘intolerable risk’
which are defined below.

e Acceptable risk

o A rrisk that, following an understanding of the likelihood and consequences, is
sufficiently low to require no new treatments or actions to reduce risk further.
Individuals and society can live with this risk without feeling the necessity to
reduce the risks any further.

e¢ Tolerable risk

o  Arisk that, following an understanding of the likelihood and consequences, is
low enough to allow the exposure to continue, and at the same time high
enough to require new treatments or actions to reduce risk. Society can live
with this risk but believe that as much as is reasonably practical should be done
to reduce the risks further.

e Intolerable risk

o  Arrisk that, following an understanding of the likelihood and consequences, is
so high that it requires actions to avoid or reduce the risk. Individuals and

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