Bushfire Hazard Assessment Management Plan v2 - 434 Lake Cooroibah Rd Lake Cooroibah v1 · RAL26/0015

Bushfire Hazard Assessment & Management Plan v2                                           NCES REF: J001445
434 Lake Cooroibah Rd Lake Cooroibah, QLD



5     BUSHFIRE RISK ASSESSMENT

5.1       General
A bushfire risk assessment 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 assesses the risk that the proposed new buildings will be
exposed to an acceptable to tolerable level of radiant heat impact from the adjacent confirmed
Potential Bushfire Intensity areas depicted on Plan BF03 – Local Hazard Map.
Plate 7 illustrates the concept of radiant heat exposure.




          Plate 7 – 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.
      •    Acceptable risk
               o    A risk 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.
      •    Tolerable risk
               o    A risk 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 believes that as much as is reasonably practicable should be
                    done to reduce the risks further.
      •    Intolerable risk
               o    A risk that, following an understanding of the likelihood and consequences, is
                    so high that it requires actions to avoid or reduce the risk. Individuals and
                    society will not accept this risk, and measures are to be put in place to reduce
                    risks to at least a tolerable level.

5.2       Likelihood of Bushfire Impact
AS/NZS ISO 31000:2018 defines ‘Likelihood’ as the chance that something might happen.
Likelihood can be defined, determined, or measured objectively or subjectively and can be
expressed either qualitatively or quantitatively (using mathematics). The following ‘likelihood’
categories for the probability of the assessed bushfire attack mechanisms impacting the
assessment area have been adopted within this assessment:
      •    Likely - Will probably occur



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