Att 5. BAL Report - 555 Louis Bazzo Dr

6.3       Anticipated severity of bushfire attack

For Site 1, the fuel values from Section 3 are applied along with the other inputs for calculating design fire parameters, summarised in Table 4 below.

 Fire Scenario Site 1 West            Fire Scenario Site 1 West          Fire Scenario Site 1 South           Fire Scenario Site 1 East            Fire Scenario Site 1 South and East

 Method 2 AS3959-2018                 Method 1 AS3959-2018               Method 2 AS3959-2018                 Method 2 AS3959-2018                 Method 1 AS3959-2018
 FDI 50                               FDI 40                             FDI 50                               FDI 50                               FDI 40
 [email protected]/23.8t/ha                Forest                             [email protected]/23.8t/ha.              [email protected]/23.8t/ha.              Forest
 Effective Slope under vegetation     Effective Slope under vegetation   Effective Slope under vegetation     Effective Slope under vegetation     Effective Slope under vegetation
 0˚ / Upslope                         0˚ / Upslope                       9⁰ Downslope                         6⁰ Downslope                         >5 -10˚ Downslope
 Fire Intensity (Byram, 1959)                                            Fire Intensity (Byram, 1959)         Fire Intensity (Byram, 1959)
 15 568kW/m (”MEDIUM”)                                                   28 968kW/m (”HIGH”)                  23 552kW/m (”HIGH”)

 Rate of Spread (Noble et al, 1980)                                      Rate of Spread (Noble et al, 1980)   Rate of Spread (Noble et al, 1980)
 1.27kph                                                                 2.36kph                              1.92kph
 Flame Height (modified Mc Arthur                                        Flame Height (modified Mc Arthur     Flame Height (modified Mc Arthur
 V equation, NSW RFS 2001) 11.08m                                        V equation, NSW RFS 2001) 18.17m     V equation, NSW RFS 2001) 15.31m
 Flame Width 100m                                                        Flame Width 100m                     Flame Width 100m
 Elevation of Receiver 2.4m                                              Elevation of Receiver 2.4m           Elevation of Receiver 2.4m
 BAL FZ within 10m of intact          BAL FZ within 10m of intact        BAL FZ within 15m of intact          BAL FZ within 13m of intact          BAL FZ within 15m of intact
 unmanaged vegetation                 unmanaged vegetation               unmanaged vegetation                 unmanaged vegetation                 unmanaged vegetation
 BAL 40 from 10 - <13m                BAL 40 from 10 - <13m              BAL 40 from 15 - <20m                BAL 40 from 13 - <17m                BAL 40 from 15 - <20m
 BAL 29 from 13 - <19m                BAL 29 from 13 - <20m              BAL 29 from 20 - <29m                BAL 29 from 17 - <25m                BAL 29 from 20 - <29m
 BAL 19 from 19 - <27m                BAL 19 from 20 - <29m              BAL 19 from 29 - <41m                BAL 19 from 25 - <35m                BAL 19 from 29 - <41m
 BAL 12.5 from 27 – 100m              BAL 12.5 from 29 – 100m            BAL 12.5 from 41 – 100m              BAL 12.5 from 35 – 100m              BAL 12.5 from 41 – 100m

Table 4. Calculated values for potential bushfire characteristics for Site 1 and methods used.

Projected fireline intensity from the west is approximately 76 982 KW/m, equating to “VERY HIGH” as indicated under latest State bushfire hazard mapping, and
to the south and east rates as “HIGH” . The assessment validates classification of the area as BPA with required compliance against AS3959-2018.

The minimum setbacks for BAL 29 (under AS3959-2018) to be viable are highlighted in red above.



For Site 2, the fuel values from Section 3 are applied along with the other inputs for calculating design fire parameters, summarised in Table 5 below.


Report compiled by Bushfire Risk Reducers for Mr Tim Olah, June 2021                                  Page 19