Attachment A to Judgment for 19Aug 2024 (6)

hazard, ie it will not carry a bushfire. Therefore, the small patch of VHC 16.1 rehabilitation at
assessment reference point L meets the criteria for the ‘small fragments filter’ in Bushfire resilient
communities.
The narrow corridors of VHC 28.2 at assessment reference points C and F are < 50 m wide and adjoin
developed land and a tidal waterbody, ie VHC 42.6 and VHC 43.6, which are defined in Bushfire resilient
communities as having discontinuous bushfire fuels and as being a low hazard, ie these adjoining areas
will not carry a bushfire. Therefore, the narrow corridors of VHC 28.2 at assessment reference points
C and F are assessed as meeting the criteria for the ‘narrow corridors filter’ in Bushfire resilient
communities.
Bushfire resilient communities recognises that small fragments and narrow corridors of vegetation
which meet the criteria for the small fragments and narrow corridors filter are less likely to ignite due
to their disconnection with large bushland areas that can carry a full intensity running fire front.
Therefore, if small fragments or narrow corridors of vegetation are ignited it will likely be from a point
ignition which requires both distance and area to develop into a running fire front of considerable
hazard. On this basis, if a fire front did emerge from the small fragment of VHC 16.1 rehabilitation at
assessment reference point L or the narrow corridors of VHC 28.2 at assessment reference points C
and F, it would be narrow in width and significantly less in intensity than a fire front which has had
sufficient time and area to develop. As a result, Bushfire resilient communities assigns small fragments
and narrow corridors of vegetation which meet the small fragments and narrow corridors filter a

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potential bushfire intensity of < 4,000 kW/m and deems them to be a non-bushfire hazard class for the
purpose of land use planning and development assessment.

3.5          Potential bushfire intensity calculations

The potential bushfire intensity of assessment reference points was determined using the Queensland
Public Safety Business Agency Potential Bushfire Intensity Calculator (version November 2014) which
                                 ft
is an Excel spreadsheet calculator that models the bushfire hazard assessment method in Bushfire
resilient communities.
                    ra

Bushfire resilient communities define bushfire hazard classes as follows:
•       very high – potential bushfire intensity > 40,000 kW/m;
•       high – potential bushfire intensity 20,000-40,000 kW/m;
          D


•       medium – potential bushfire intensity 4,000-20,000 kW/m; and
•       non-bushfire hazard – potential bushfire intensity < 4,000 kW/m.
Results of the potential bushfire intensity calculations which determine the bushfire hazard class of
assessment reference points shown in Figure 2.1 are presented in Table 3.2.
    Table 3.2 Potential bushfire intensity
    Assessment        VHC             Potential fuel load   Slope (o)2   Potential   Bushfire hazard class
    reference                         (tonnes/ha)1                       bushfire
    point                                                                intensity
                                                                         (kW/m)
    A                 VHC 22.1        28.4                  0            24,003      High
    B                 VHC 42.6        2                     0            119         Non-bushfire hazard class
    C                 VHC 28.2        -                     -            < 4,0003    Non-bushfire hazard class
    D                 VHC 43.6        0                     0            0           Non-bushfire hazard class
    E                 VHC 41.4        3                     0            268         Non-bushfire hazard class
    F                 VHC 28.2        -                     -            < 4,0003    Non-bushfire hazard class


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