7. Attachment F - Bushfire Hazard Assessment

                                                                    Bushfire Hazard Assessment and Management Plan




                             20,000 – 40,000 kW/m                                   High


                              4,000–20,000 kW/m                                   Medium


                                0 – 4,000 kW/m                          Low/Not bushfire prone


Section 4.2.6 of the QFES BRC technical guide provides a series of mapping rules (‘patch and corridor
filtering’) for modifying the potential fireline intensity of bushfire-prone areas to reflect the likelihood of
lower potential fireline intensities in smaller vegetation patches and narrow vegetated corridors. These
rules are applied as follows:

       1. Remove patches of continuous fuel < 1 ha in area that are surrounded by either no fuel or non-
             continuous fuel and are further than 100 m from any other continuous fuel greater than 2 ha;

       2. Downgrade the effective fuel load of small patches of continuous fuel measuring a. 1 – 2 ha –
             downgrade by 66% and b. 2 – 3 ha – downgrade by 50 % if the patch is surrounded by either
             non-continuous fuel or a low-hazard vegetation or land-use type and if the patch is further than
             100m from any other continuous -fuel vegetation patch greater than 2 ha; and

       3. Remove narrow corridors and area of continuous fuel that are less than 50 m in width.

Based on the results of the site-specific assessment, vegetation within the assessment area does not
meet any of the patch and corridor filtering rules outlined in QFES (2019).

The potential fireline intensity was calculated for bushfire-prone vegetation within 150 m of the site using
the inputs from Steps 1 - 3. In accordance with Section 7.6 of the BRC Technical Guide, fireline intensity,
radiant heat flux and bushfire attack level is not required to be calculated for non-bushfire prone (i.e.
VHCs with a prone type of 2) or low hazard VHCs (i.e. VHCs with a prone-type of 3), therefore VHCs
39.3 and 42.6 have been excluded from calculation of potential fireline intensity. Remodelled potential
fireline intensity for bushfire-prone vegetation to the south and south-west of the site is provided in Table
5:

               Table 5: Potential fireline intensity for classified VHCs within 150 m assessment area


     Location of                                  Effective slope –
     classified                              average slope beneath         Fire       Potential   Potential   Remodelled
 vegetation in                                     bushfire-prone        weather       fireline   bushfire     bushfire
                       VHC         Status
     relative to                             vegetation in relation      severity     intensity    hazard       hazard
 development                                      to development          (FFDI)        (PFI)       class       class
        area                                            (degrees)


                                                                                       47,192
         E             8.1        Remnant        5.5        Downslope       48                    Very High   Very High
                                                                                     290 kW/m


                                                                                       39,880
        SE             8.1        Remnant        3.06       Downslope       48                      High        High
                                                                                       kW/m


                                                                                       37,067
        NE             8.1        Remnant        2.0        Downslope       48                      High        High
                                                                                       kW/m




                                                         PR22428_BHAMP_199 Beddington Road, Doonan               Page 17