Appendix F - Bushfire Hazard Assessment & Management Plan

Bushfire Hazard Assessment & Management Plan v1                                                NCES REF: J000669
Lot 2 on RP131369 – 108 Black Mountain Range Road, Black Mountain



                  society will not accept this risk and measures are to be put in place to reduce
                  risks to at least a tolerable level.
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.
      ·    Unlikely - Could occur but doubtful.

4.2       Risk from Identified Hazardous Vegetation
The Plan of Development depicts the building envelope within proposed Lot 2 external of the
mapped Potential Impact Buffer Area. The bushfire risk acting on the proposed building
envelope, in the absence of additional mitigation measures being implemented, is detailed in
Table 2.
                                       Table 2 - Risk Assessment (Lot 2)

 Direction & Slope             North            East          South                      West 12º

 Distance to
 hazardous                       N/A            N/A              N/A                      ~170m
 vegetation

 VHC’s                            -               -                 -                       9.1

 Attack Mechanism

 Smoke*                     Not             Not            Not             Not assessed
                            assessed        assessed       assessed

 Ember**                         N/A        N/A            N/A                     Likely - Acceptable

 Radiant Heat***                                                              Likely – Tolerable 0.9kW/m²
                                 N/A        N/A            N/A
                                                                                   (refer Appendix 2)

 Flame****                       N/A        N/A            N/A                     Likely - Acceptable
* Risk of smoke impact has not been assessed. Smoke can travel long distances and exhibit a variety of densities
and composition. It is therefore not readily practicable to determine the separation distances needed to attain the
various risk classes. Furthermore, individuals will react differently to smoke impacts whereas individuals will
generally exhibit similar reactions to direct flame and radiant heat.
** Sites <50m = Intolerable risk, >50m-<100m = Tolerable and >100m = Acceptable.
*** 1kW/m² radiant heat exposure is considered the upper limit of tolerable indefinite radiant heat exposure to
humans (QFES 2019).
**** Assets located within 1.5 x the modelled flame length from the Flamesol output are assigned an Intolerable
Risk.
Assets located within >1.5 - <3 x the modelled flame length from the Flamesol output are assigned a Tolerable
Risk.
Assets located >3 x the modelled flame length from the Flamesol output are assigned an Acceptable Risk.

4.3       Summary
Vegetation to the west to north-west of the site is located within a high-risk fire pathway to the
site given the typical high fire danger conditions attributed to north-westerly winds. The Plan
of Development provides an approximate 170m setback to VHC 9.1 open Eucalypt forest
occurring to the west of Black Mountain Range Road. The risk of fire impact from the west is
therefore restricted to an acceptable risk of direct flame contact and ember attack and a
tolerable level of risk from radiant heat impact. The risk of grassfire movement is also noted
as inherently present. The identified severity of risk is anticipated to be reduced to an




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