Information Response - Email 1 of 2 MCU16/0153 & REC16/0041

4.4.2.1    Rate of Spread
Shrub and heath – R = 0.023 *V1.21*VH0.54 (Catchpole et al. 1998)

Where

          R = rate of spread (km/hr)

          V = Average wind speed at 10m above the ground (km/h)
             (Note: for heath vegetation, a nominal value of 45km/h shall be used)

          VH = average height of classified vegetation (m)

4.4.2.2    Fire Intensity

I = H*W*R/36 (Byram 1959)

Where

          I = fire intensity (kW/m)

          H = heat of combustion (kJ/kg) - approximated as 18,600 kJ/kg

          W = overall fuel loads (t/ha)

Potential bushfire intensity was then classified according to the categories outlines in Table
6 below.

                Table 6 – Potential Bushfire Intensity Classifications (Leonard et al. 2014)
                      Potential Bushfire Intensity Class   Potential Fire-line Intensity

                      Very High (potential intensity)                40,000+ kW/m

                      High (potential intensity)                 20,000 – 40,000 kW/m

                      Medium (potential intensity)               4,000 – 20,000 kW/m



4.4.2.3    Flame Length

Shrub and heath – Lf = 0.0775I0.46

Where

          Lf = flame length (m)

          I = fire intensity (kW/m)

4.4.3      Results – Anticipated severity of bushfire attack
The calculated values for potential bushfire characteristics at the site are provided in Table
7 below.

The modelling predicts slow moving, but very high potential intensity fires from the west
with predicted maximum flame lengths of approx. 10.5m.




                                           Bushfire Management Plan
February 2015                                                                              Page 19
                                      215 David Low Way, Peregian Beach
                                            Scanlon Property Group