Kenlynn Castaways Beach BMP

   Figure 13. Main Bushfire Attack mechanisms (Image courtesy of Ramsay & Rudolf, 2003)

   6.3        Anticipated severity of bushfire attack

   The fuel values from Section 3 are applied along with the other inputs for calculating design fire parameters
   associated with the assessed fuel zones, summarised in Table 6 below.

   Fire Scenario – Area 1            Fire Scenario – Area 1           Fire Scenario – Areas 2, 3 & 4    Fire Scenario – Areas 2, 3 & 4

   Method 2 AS3959-2009              Method 1 AS3959-2009             Method 2 AS3959-2009              Method 1 AS3959-2009
   FDI 50                            FDI 40                           FDI 60                            FDI 40
   Forest @ 12/18t/ha.                                                Forest @ 12/18t/ha.
   Ave Slope under vegetation 6⁰     Ave Slope under vegetation 5 -   Ave Slope under vegetation        Ave Slope under vegetation 10
   Down                              10⁰ Down                         11⁰ Down                          - 15⁰ Down
   Fire Intensity (Byram, 1959)                                       Fire Intensity (Byram, 1959)
   11 439kW/m (“MEDIUM”) *                                            7 642kW/m (“MEDIUM”) *

   Rate of Spread (Noble et al,                                       Rate of Spread (Noble et al,
   1980)                                                              1980)
   * 1.23kph (reduced to 80% of                                       * 0.87kph (reduced to 80% of
   max)                                                               max)
   Flame Height (modified Mc                                          Flame Height (modified Mc
   Arthur V equation, NSW RFS                                         Arthur V equation, NSW RFS
   2001) 10.16m                                                       2001) 7.7m
   Flame Width 100m                                                   Flame Width 100m
   Elevation of Receiver 2.4m                                         Elevation of Receiver 2.4m
   BAL FZ within <9m of intact       BAL FZ within 12m of intact      BAL FZ within <7m of intact       BAL FZ within 19m of intact
   unmanaged vegetation              unmanaged vegetation             unmanaged vegetation              unmanaged vegetation
   BAL 40 from 9 - <12m              BAL 40 from 12 - <16m            BAL 40 from 7 - <9m               BAL 40 from 19 - <25m
   BAL 29 from 12 - <17m             BAL 29 from 16 - <24m            BAL 29 from 9 - <14m              BAL 29 from 25 - <36m
   BAL 19 from 17 - <25m             BAL 19 from 24- <34m             BAL 19 from 14 - <20m             BAL 19 from 36 - <49m
   BAL 12.5 from 25 – 100m           BAL 12.5 from <34 – 100m         BAL 12.5 from 20 – 100m           BAL 12.5 from <49 – 100m
   (View Factor Method – see graph                                    (View Factor Method – see graph
   below)                                                             below)

   Table 6. Calculated values for potential bushfire characteristics, and methods used.

Given that fires approaching both assets are likely to be early restarts and/or having a short fire run length, the
Forward Rate of Spread has been reduced by 20% of the calculated maximum.

   Report compiled by Bushfire Risk Reducers for Kenlynn Pty Ltd, August 2016                                Page 18