Bushfire Hazard Assessment & Management Plan v4 - 7 Triller Court, Pomona

Bushfire Hazard Assessment & Management Plan v4                                           NCES REF: J000841
Lot 4 on SP320405 – 7 Triller Court, Pomona



4     BUSHFIRE RISK ASSESSMENT

4.1       General
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 adjoining
the hazardous vegetation will be exposed to bushfire ember, radiant heat and/or flame attack
from the adjacent confirmed Bushfire Potential Intensity areas depicted on Plan No. BF-03.
Plate 12 illustrates the main bushfire attack mechanisms acting on buildings.




          Plate 12 – 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 believe that as much as is reasonably practical 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.




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