Bushfire Risk Assmt & Risk Mngt Plan for house at 8 Hinterland Cl, Tinbeerwah Revision 1 June 2022 ENAM

                         Ecological Natural Area Management

      •    Slope in the vegetation = 13.90
      •    Site slope = 13.90
      •    FFDI = 50
      •    Fire run = 200m leading to a 0.63 reduction of the bushfire rate of spread from the full
           quasi-steady state rate of spread

6.4       Results of bushfire attack modelling
Table 5: Assessed Bushfire Attack Levels (BAL) for the modelled bushfire attacks
                                                        Modelled bushfire attack
Modelled bushfire parameter                               North bushfire attack
Separation from the hazard                                     23 m
                                           VHC 9.1 Moist to dry eucalypt open forests on
Vegetation                                         coastal lowlands and ranges
Modelled surface fuel load                                   17.5 t/ha
Modelled total fuel load                                     24.2 t/ha
Vegetation slope (degrees)                                   13.9 0
Site slope (degrees)                                         13.9 0
Fire run                                                      200 m run
Proportion of QSS ROS                                        0.63
QSS ROS                                                      2.74 km/h
Modelled rate of spread                                      1.73 km/h
Flame width                                                   100 m
Radiant heat                                                17.86 kW/m2
Modelled fire line intensity                                21631 kW/m
Modelled flame length                                       14.16 m
Level of construction (BAL)                                BAL 19

From above the minimum Asset Protection Zone required is 23 for the south bushfire attack and
The worst case Bushfire Attack Level from bushfire behaviour modelling is BAL 19
See Appendix 2 for a detailed software reports from which the above table was generated.

6.5       Assessment of the minimum Asset Protection Zone
The minimum Asset Protection Zone requirement is 23m for a Radiant Heat of 17.86 kW/m2.

6.6       Bushfire Attack Levels for each building elevation
Australian Standard AS3959 Construction of buildings in bushfire-prone areas specifies that the
building elevation opposite the assessed bushfire attack direction can be reduced on BAL level due
to shielding by the building so the Bushfire Attack Levels for each of the building elevations are:
      •    BAL 19 for the east, south and north building elevations and
      •    BAL 12.5 for the west building elevation.




Bushfire Risk Assessment and Management Plan for a house at 8 Hinterland Cl, Tinbeerwah          June 2022

                                                              19