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

                         Ecological Natural Area Management


6 Assessment of APZ, Radiant Heat and Bushfire Attack Level
An assessment of Asset Protection Zone Widths, associated Radiant Heat Loads and a Bushfire
Attack Level as related to Radiant Heat Loads will be conducted using the protocol in Bushfire
Resilient Communities
6.1    Assessment of Asset Protection Zones and Radiant Heat Loads
The Building Code of Australia references Australian Standard AS3959 Construction of buildings in
bushfire-prone areas for Deemed to Satisfy building requirements for bushfire risk management
construction of buildings.
This section assesses Asset Protection Zone Widths, associated Radiant Heat Loads and Bushfire
Attack Level as related to Radiant Heat Loads for the house to determine a level of construction
required to achieve the objective of the Standard which is to “prescribe particular construction
details for buildings to reduce the risk of ignition from a bushfire while the fire front passes”.
(Standards Australia, 2009). Bushfire Resilient Communities allows the use of Method 2 of
Australian Standard AS3959, subject to the adoption of site-specific values of FFDI, site-specific
vegetation hazard classes, modified modelling of surface fuel loads and effective and site slopes
This report uses software developed by Newcastle Bushfire Consulting which models the Bushfire
Attack Level using Method 2 of Australian Standard AS3959.
6.2    Modelled bushfire attacks
The west bushfire attack was modelled based on the proximity of classified vegetation.




Figure 11: Map showing the modelled bushfire attack directions

6.3    Bushfire parameters used in the bushfire behaviour modelling
The bushfire attack uses bushfire attack parameters as specified by Bushfire resilient Communities
East bushfire attack
This modelled fire burns up-slope through Eucalyptus spp, Corymbia tessellaris open forest to
attack from the east.
    • This attack uses fuel loads specified for VHC 9.1 Moist to dry eucalypt open forests on
        coastal lowlands and ranges of 17.5 t/ha surface fuel & 24.2 t/ha total fuel ,
    • Separation of the house from the hazard as required for an appropriate Asset Protection
        Zone – in this case 23m

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

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