Refernce Documents - RAL25 0001

                 of fires and events suited to mitigation through land use planning in Queensland and was
                 based on advice from the Queensland Fire and Emergency Services.

                 An FFDI of 47 was adopted based on the 5% AEP event as per Leonard et al. (2014).

                 5.2          MODEL

                 5.2.1        PATCH AND CORRIDOR FILTERING

                 Hazardous vegetation within rural and urban landscapes is frequently fragmented, giving rise
                 to smaller patches and narrow corridors of vegetation that are likely to have lower fireline
                 intensities than larger expanses of continuous vegetation.

                 The spatial context of these patches and corridors of vegetation has a major influence on the
                 likelihood of fire arrival, the severity of a fire at the boundary of the patch, and the behaviour
                 of a fire within the patch.

                 Because of the potential contribution of grass fires to the intensity of fire in tree or shrub
                 dominated hazardous vegetation, bushfire hazard assessment of patches and corridors needs
                 to take account of the fuel properties of adjacent vegetation or other land uses.

                 Continuous vegetation, such as forest, shrubland or grass, has a generally uniform distribution
                 of fuel that supports a continuous flame front under a range of weather conditions. In
                 contrast, non-continuous vegetation or land uses, such as built-up areas or water bodies, are
                 not expected to support a continuous flame front because they do not contain sufficient fuel
                 load to carry a fire.

                 Patch and corridor filtering rules are therefore required to identify and amend the estimated
                 hazard potential of narrow or small patches of vegetation likely to prevent a running fire front
                 from reaching the potential fireline intensity levels estimated by Equation 1 (Refer to Section
                 5.2.2).

                 Patch and corridor filtering rules were applied to the locally refined vegetation hazard class
                 map in accordance with Leonard and Opie (2017) and Bushfire Resilient
                 Communities (Queensland Fire and Emergency Services 2019) to reflect the likelihood of
                 lower fireline intensities in smaller vegetation patches and narrow vegetation corridors,
                 particularly where those patches are otherwise surrounded by fragmented and discontinuous
                 fuel sources, such as small patches and narrow corridors of vegetation within established
                 urban areas.

                 5.2.2 POTENTIAL FIRELINE INTENSITY

                 The modelling included the following measures of fire behaviour:

                         i.    Potential bushfire fireline intensity (PFI, kW/m);

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Document Set ID: 23448646
Version: 1, Version Date: 13/01/2025