Reference Document - RAL26 0015 - Bushfire Hazard Assessment (As Published) · RAL26/0015

                 Bushfire Hazard Assessment & Management Plan v2                                      NCES REF: J001445
                 434 Lake Cooroibah Rd Lake Cooroibah, QLD



                       •    Unlikely - Could occur but doubtful
                 The determination of whether a bushfire event is likely or unlikely to impact the site has been
                 based on the relative position of hazardous vegetation to the site and its connectivity with
                 hazardous bushland areas. A fire burning in hazardous vegetation located upwind of the site
                 under typical south-east Queensland seasonal fire winds from the north to north-west to west
                 to south-west is considered to represent a ‘likely’ probability of impact to the site. A fire burning
                 in hazardous vegetation located downwind of the site under typical south-east Queensland
                 seasonal fire winds is considered to represent an ‘unlikely’ probability of impact, albeit
                 acknowledged that the back head of a fire may nonetheless impact the site however the
                 intensity of the back head is not considered to be significant for the risk assessment at hand.
                 Hazardous vegetation has been confirmed to the north and west of the development footprint.
                 The likelihood of a fire positioned to the north and west of the site approaching toward the site
                 is considered likely as seasonal fire winds would be expected to drive the fire front toward the
                 site. A forest fire burning toward the Lot 7 building area from the north and west would however
                 be expected to revert to a low intensity grassfire upon interception of the cleared low threat
                 VHC 41.4 conditions to the north and west of the proposed building footprint in Lot 7.

                 5.3       Consequences of Impact
                 The consequences of a fire front positioned to the north and west of the site would be expected
                 to include radiant heat impact and ember attack which can lead to damage to property and or
                 injury or loss of life.
                 The Flamesol results infer direct flame contact to the Lot 7 boundaries from SU1b (Lf =
                 11.15m) to the north would not occur by virtue of the 60m available separation. Similarly, the
                 Flamesol results infer direct flame contact to the Lot 7 boundaries from SU2 (Lf = 12.59m) to
                 the west would not occur by virtue of the 67m available separation.
                 Spotting across the low threat conditions would remain an inherent risk and could impact the
                 site and surrounding land.
                 Radiant heat exposure risk primarily affects the northern and western facades of the future
                 dwelling/s in Lot 7.
                 The BRC 2019 identifies that exposure to 1 kW/m² RHF represents the maximum for indefinite
                 skin exposure and at 2 kW/m²:
                       •    Pain is felt on bare skin after 1 minute exposure (non-fatal); and
                       •    Firefighters with protective clothing can withstand this exposure level for a          few
                            minutes however, they are likely to experience rise in core body temperature.
                 The above impacts are therefore possible within Lot 7 given it is located <100m from the
                 identified hazardous vegetation.
                 Assessment Benchmark 4 of the Department of Infrastructure, Local Government and
                 Planning’s Natural Hazards, Risk and Resilience –– Bushfire (December 2019) State Planning
                 Policy – state interest guidance material, references radiant heat flux (RHF) exposure of
                 <29 kW/m² on a Reconfiguration of a Lot development footprint plan as generating an
                 Acceptable to Tolerable level of risk for non-vulnerable uses. Exposure to <29 kW/m² RHF:

                       •    reduces potential exposure to bushfire attack, particularly direct flame contact;
                       •    reduces the likelihood of piloted ignition due to radiant heat exposure;
                       •    improves consistency between planning and building outcomes;
                       •    reduces potential for conflicts between planning and building approvals; and
                       •    avoids duplication and regulatory burden on home owners.
                 Note, building exposure of <29 kW/m² RHF is not to be misrepresented to infer acceptable
                 protection of human life in exposed conditions.
                 A building envelope is identified on the plan of development hence the exposure risk is to be
                 assessed from the proposed building envelope boundaries.
                 Table 1 confirms the following setbacks are required to achieve <29 kW/m² RHF exposure to


Document Set ID:©24816699
                    2026                                               19
Version: 1, Version Date: 25/05/2026