Appendix D - Bushfire Assessment · RAL26/0026

Table 2 – Radiant Heat Flux Minimum Setbacks to secure <29kW/m²

Direction        Slope                         Flame width        VHC    Minimum Setback Requirement
 South           Across slope/Up slope         100m               9.1    12.1m
 South           Across slope/Up slope         100m               22.1   13.6m

The building envelope within proposed Lot 2 is provided with a 10m wide setback from the southern
property boundary consisting of low hazard vegetation and land uses to achieve compliance with
Assessment Benchmark 4. This is in addition to the external firebreak of approximately 25m width
provided by Mckinnon Drive. The 10m wide internal setback can be maintained as a low hazard VHC 39.2
vegetation type with low and discontinuous fuel loads. The 10m wide setback is required to be maintained
as a dedicated APZ in order ensure that adequate separation is provided between future infrastructure
and to achieve compliance with Assessment Benchmark 4. The APZ is to be maintained as per the criteria
detailed below.

5.2.1   Asset Protection Zone Design
Landscaping within the 10m wide APZ shall comprise species that are characterised by minimal fuel
generation and is to satisfy Assessment Benchmark 7 of the SPP Bushfire 2019. Assessment Benchmark 7
of the SPP Bushfire 2019 states that where a requirement for an asset protection zone exists, landscaping
treatments are to comprise only low threat vegetation such as grassland managed in a minimal fuel
condition, maintained lawns, vineyards, orchards, cultivated gardens, nature strips and/or windbreaks.
OR
Landscaping management maintains a potential available fuel load which is less than eight tonnes/hectare
in aggregate, and fuel structure which is discontinuous (as per the current land use and vegetation
conditions).
OR
Development includes a bushfire management plan for the maintenance of any identified asset protection
zone, including landscape design and ongoing vegetation management.

To reduce the potential for bushfire impact to the future built infrastructure within Lot 2 as a result of
future landscaping, regrowth and fuel load accumulation within the site, the 10m APZ is to be established
and maintained according to the following criteria:
     The APZ is maintained as a low threat zone dominated by a maintained grassy surface cover to a
        nominal 100mm height which is regularly mowed to reduce fuel loads and the risk of a grassfire
        encroaching toward the building
     Any landscaping within the APZ is to satisfy the low threat vegetation criteria prescribed in section
        2.2.3.2 of AS3959:2018 and be planted as discrete isolated clumps of low flammability vegetation
        aligned parallel to the building to aid in interception of ember and smoke attack and not
        perpendicular and in a manner which could transmit fire toward the building. Note that the current
        row of screening plants along the southern property boundary already achieves this.
     No woody mulch is to be used within 2m of buildings
     Landscaping only incorporates locally indigenous, low flammability species and or low density
        plantings of suitable open forest /woodland species with low bark shedding characteristics




AUGUST 2026                    BUSHFIRE HAZARD ASSESSMENT & MANAGEMENT PLAN                        Page: 22
                                       380 MCKINNON DRIVE, COOROIBAH