Appendix D - Bushfire Risk Assessment and 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 10: Map of vegetation patches used for patch filtering

Patch filtering tabulation
Patch     Initial class              Merge class               Reason for merge                                Potential load
Patch 1 VHC 9.1 Moist to dry         VHC 9.1 Moist to dry      No merge as patch is large. Remains as            24.1 t/ha
        eucalypt open forests        eucalypt open forests     VHC 9.1 Moist to dry eucalypt open forests
        on coastal lowlands          on coastal lowlands       on coastal lowlands
Patch 2 Discontinuous low            Discontinuous low         No merge as patch is large. Remains as              3 t/ha
        grass or tree cover          grass or tree cover       Discontinuous low grass or tree cover
Patch 3 VHC 9.1 Moist to dry         Discontinuous low         Patch 3 (Moist to dry eucalypt open forests)        3 t/ha
        eucalypt open forests        grass or tree cover       allocated to Discontinuous low grass or tree
        on coastal lowlands                                    cover 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 VHC 9.1 Moist to dry         Discontinuous low         Patch 3 allocated to Discontinuous low              3 t/ha
        eucalypt open forests        grass or tree cover       grass or tree cover through the “filtering
        on coastal lowlands                                    process
Patch 5 Discontinuous low            Discontinuous low         No merge as patch is large. Remains as              3 t/ha
        grass or tree cover          grass or tree cover       Discontinuous low grass or tree cover
Patch 6 VHC 9.1 Moist to dry         VHC 9.1 Moist to dry      No merge as patch is large. Remains as            24.1 t/ha
        eucalypt open forests        eucalypt open forests     VHC 9.1 Moist to dry eucalypt open forests
        on coastal lowlands          on coastal lowlands       on coastal lowlands
Patch 7 VHC 39.2 Low to              VHC 39.2 Low to           No merge as patch is large. Remains as              8 t/ha
        moderate tree cover in       moderate tree cover in    VHC 39.2 Low to moderate tree cover in
        built-up areas               built-up areas            built-up areas
Patch 8 VHC 3.1 Notophyll vine VHC 3.1 Notophyll vine No merge as patch is large. Remains as                      4.5 t/ha
        forest                 forest                 VHC 3.1 Notophyll vine forest
Patch 9 VHC 9.1 Moist to dry         VHC 9.1 Moist to dry      No merge as patch is large. Remains as            24.1 t/ha
        eucalypt open forests        eucalypt open forests     VHC 9.1 Moist to dry eucalypt open forests
        on coastal lowlands          on coastal lowlands       on coastal lowlands




Bushfire Risk Assmnt & Mngt Plan for a “Community housing” development at 55 Carpenters Rd, Cooroy               February 2022

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