Reference Document - Bushfire Risk Assessment & Bushfire Risk Management Plan

                           Ecological Natural Area Management

Patch and corridor filtering
Leonard et al (2014) specify a filtering process to
remove or downgrade hazard levels of small
patches and narrow corridors of hazardous
vegetation as fire-line intensity in these small
patches is unlikely to reach the level predicted for
large contiguous patches of vegetation (Leonard et
al (2014), page 5). Using the map below, patch and
corridor filtering was conducted.




                                                                 Figure 8: Map of vegetation patches used for
                                                                 assessment of patch and corridor filtering


Table 4: Patch filtering tabulation
Patch      Initial class           Merge class              Reason for merge                                Potential load
Patch 1    Moist to dry eucalypt   Moist to dry eucalypt    No merge as patch is large. Remains as            24.1 t/ha
           open forests            open forests             Moist to dry eucalypt open forests
Patch 2    Low grass or tree       Low grass or tree        Remains as Low grass or tree cover in rural         5 t/ha
           cover in rural areas    cover in rural areas     areas
Patch 3    Moist to dry eucalypt   Low grass or tree        Allocated to Low grass or tree cover in rural       5 t/ha
           open forests            cover in rural areas     areas through the “filtering process to
                                                            remove or downgrade hazard levels of
                                                            vegetation less than 100m wide through
                                                            patch erosion and dilation...allocating it to
                                                            the class most common to the patch
                                                            boundary (Leonard et al, 2014), page 5.
Patch 4    Moist to dry eucalypt   Low grass or tree        Allocated to Low grass or tree cover in rural       5 t/ha
           open forests            cover in rural areas     areas through the “filtering process above
Patch 5    Moist to dry eucalypt   Low grass or tree        Allocated to Low grass or tree cover in rural       5 t/ha
           open forests            cover in rural areas     areas through the “filtering process above
Patch 6    Moist to dry eucalypt   Low grass or tree        Allocated to Low grass or tree cover in rural       5 t/ha
           open forests            cover in rural areas     areas through the “filtering process above
Patch 7    Low grass or tree       Low grass or tree        Remains as Low grass or tree cover in rural         5 t/ha
           cover in rural areas    cover in rural areas     areas
Patch 8    Moist to dry eucalypt   Low grass or tree        Allocated to Low grass or tree cover in rural       5 t/ha
           open forests            cover in rural areas     areas through the “filtering process above
Patch 9    Low grass or tree       Low grass or tree        Remains as Low grass or tree cover in rural         5 t/ha
           cover in rural areas    cover in rural areas     areas




Bushfire Risk Assessment and Management Plan for a house at 64 Pheasant Lane, Doonan                         September 2020

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