Item 14 Appendix G - Bushfire Hazard Assessment-1.0 · MCU22/0094

                                                                                  BHA Report forLot 4 Noosa Civic, Hoffman Drive, Noosaville




Direct Flame Contact

Direct flame attack refers to flame contact from the main fire front, the flame that engulfs burning vegetation is the same flame
that contacts the building. It is estimated that only 10 to 20 per cent of buildings lost to bushfire occur as a direct result of flame
attack.


Ember and Firebrand Attack

CSIRO research has shown that ember attack is the cause of up to 80% of house loss in Australia. The convective forces of
bushfire raise burning embers into the atmosphere on prevailing winds and deposit them to the ground ahead of the fire front.
Typically, ember attack occurs approximately 30 minutes prior to the arrival of the fire front and continues during the impact of
the fire front and for several hours afterwards. Building loss via ember attack relates largely to the vulnerabilities and
peculiarities of each building, its distance from the classifiable vegetation and whether someone is present to actively defend
the building.


Radiant Heat

Measured in kilowatts per m2, radiant heat is the heat energy released from the fire front which radiates to the surrounding
environment, deteriorating rapidly over distance. In terms of impacts on buildings, radiant heat can pre-heat materials making
them more susceptible to ignition. Radiant heat can also damage building materials such as window glazing, allowing openings
into a building through which embers may enter.


Fire Driven Wind

The convective forces of a bushfire typically result in strong fire-driven winds, which can lead to building damage. The typical
effects of fire driven wind include conveyance of embers, damage from branches and debris hitting the building, as well as
direct damage to vulnerable building components, such as lifting roofs and the breakage of windows.




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+ Property vegetation assessments
+ Site planning for bushfire
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