Att 2 - BAL Report

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3.5. BAL Calculation

An AS3959 Method 2 calculation was performed using the inputs detailed above and summarised in Table 2
below. The result is BAL-12.5 for the subject site (refer Method 2 Calculations using Fire Protection
Association’s (FPA’s) Flamesol Calculator in Appendix B).

              Table 2 – Summary information for Vegetation classification (per AS3959) and BAL calculations
 Plot        Vegetation Hazard          Vegetation       Vegetation Description                           Distance     Slopes        BAL Rating
 Number      Class (VHC) & Potential    Classification                                                    to                         for each
             Fuel Loads                 (AS3959)                                                          dwelling                   Plot
                                                                                                                                     (AS3959)
 Plot 1      BRC’s default fuel loads   Class G          Plot 1 is located northwest to north of the      19.9m        Effective     BAL-12.5
             values used for VHC        Grassland        subject site. Plot 1 has a predominantly                      Slope:
             40.4:                                       grassy canopy with a few mature trees.                        Upslope
                                                         Tree canopy cover <10%.
             Understorey Fuel load:
             4.5t/ha                                                                                                   Site Slope:
             Total fuel load: 5t/ha                                                                                    Upslope
 Plot 2      BRC’s default fuel loads   Class A Forest   Vegetation Plot 2 is located northwest to        59m          Effective     BAL-12.5
             values used for VHC                         northeast of the subject site. Plot 2 consists                Slope: 15°
             16.1:                                       of a dominant Eucalypt canopy with an
                                                         understorey of juvenile trees, shrubs, and
             Understorey Fuel load:                      grasses. Canopy foliage cover >50%, tree                      Site Slope:
             13.8t/ha                                    height to 30m at maturity.                                    Upslope
             Total fuel load: 16t/ha
 Plot 3      BRC’s default fuel loads   Class G          Plot 3 surrounds the subject site. Plot 3 has    19.9m        Effective     BAL-12.5
             values used for VHC        Grassland        a predominantly grassy canopy with some                       Slope: 15°
             40.4:                                       mature and juvenile trees. Tree canopy
                                                         cover <10%.
             Understorey Fuel load:                                                                                    Site Slope:
             4.5t/ha                                                                                                   Flat
             Total fuel load: 5t/ha
 Plot 4      BRC’s default fuel loads   Class F          Vegetation Plot 4 is located southwest to        70m          Effective     BAL-12.5
             values used for VHC        Rainforest       northwest of the subject site. Plot 4 consists                Slope: 15°
             2.1:                                        of a canopy consisting of various species
                                                         with an understorey of juvenile trees,
             Understorey Fuel load:                      shrubs, ferns, and grasses. Canopy foliage                    Site Slope:
             3.5t/ha                                     cover >90%.                                                   15°
             Total fuel load: 3.5t/ha
 Plot 5      BRC’s default fuel loads   Class G          Plot 5 is located southwest to northwest of      83m          Effective     BAL-LOW
             values used for VHC        Grassland        the subject site. Plot 5 has a predominantly                  Slope:        (per Tables
             40.4:                                       grassy canopy with a few trees. Tree                          Upslope       2.4-2.7)
                                                         canopy cover <10%.
             Understorey Fuel load:                                                                                    Site Slope:
             4.5t/ha                                                                                                   15°
             Total fuel load: 5t/ha
 Plot 6      BRC’s default fuel loads   Class A Forest   Plot 6 is located northwest of the subject       47m          Effective     BAL-12.5
             values used for VHC                         site. Plot 6 consists of a dominant Eucalypt                  Slope: 15°
             16.1:                                       canopy with an understorey of juvenile
                                                         trees, shrubs, and grasses. Canopy foliage
             Understorey Fuel load:                      cover >50%, tree height to 30m at maturity.                   Site Slope:
             13.8t/ha                                                                                                  1°
             Total fuel load: 16t/ha
 Managed                                Excluded         All other areas surrounding the proposed         n/a          n/a           BAL-LOW
 Areas                                  Clause 2.2.3.2   subject site, within the assessment area,
                                        (e) and (f)      are exempt from classification as they
                                                         consist of low vegetation cover, highly
                                                         modified vegetation that is considered low
                                                         threat (gardens and lawns), gravel or
                                                         sealed surfaces and other infrastructure
                                                         (houses, driveways, roads, etc).


 Bushfire Attack Level (BAL) for the proposed new secondary dwelling, and associated infrastructure                                  BAL-12.5


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