7. Attachment F - Bushfire Hazard Assessment

                                                            Bushfire Hazard Assessment and Management Plan



3.1.2.2 Potential Fuel Loads

Fuel loads have been allocated for each VHC to represent the long-unburnt condition that would be
typically exhibited 10 years after fire. In accordance with the values provided in Figure 14 of the BRC
Technical Guide (QFES, 2019a), the potential fuel load values for ground-truthed VHCs within and
surrounding the site are as provided in Table 2.

            Table 2: Potential fuel loads for classified vegetation within 150 m assessment area.


                                     Total      Total
                                    potential   overall
              VHC                   surface     potential        Prone type 1            Fuel continuity2
                                    fuel load   fuel load
                                     (t/ha)     (t/ha)

        Wet eucalypt tall open                                     Bushfire-prone –
8.1                                   31.0        35.0       1                           1    Continuous
                forest.                                           Forest / Shrub fires


        Low to moderate tree                                      Non-bushfire prone
39.2                                  5.0          8.0       3                           2   Discontinuous
        cover in built-up areas.                                     – Low hazard.


       Nil to very low vegetation                                 Non-bushfire prone
42.6                                  2.0          2.0       3                           2   Discontinuous
                cover.                                               – Low hazard.


3.1.3 Step 3 - Site and Effective Slope

Two slope input parameters are required for the estimation of fire behaviour and separation. Site slope
is the slope of the ground between the edge of the proposed development (or site boundary) and the
edge of hazardous vegetation. Effective slope refers to the slope of the land beneath hazardous
vegetation. Effective slope is the more important parameter as it has a direct influence on the potential
rate of fire spread, fuel consumption and thus, potential fireline intensity. For each vegetation hazard
class, the effective slope is determined by assessing the slope beneath classified vegetation (in
degrees) which most influences bushfire behaviour and the relative position of land supporting
hazardous vegetation in relation to the development i.e. upslope or downslope. Where there is more
than one slope beneath classified vegetation, each slope should be individually assessed, and the
worst-case scenario adopted.

The topography of the site and surrounding land is undulating with variable slopes due to dissection by
gullies and watercourses. Slope measurements have calculated using LiDAR-derived 1 metre contour
data published by the Department of Resources and verified by site measurement. The site slopes
gently down from the western portion of the site to the east.

The site slope and effective slope angles for all hazardous vegetation within the assessment area have
been calculated and are shown in Table 3.




1 Prone type taken from the VHC Data sheet of the SPP Bushfire APZ Calculator.
2 Fuel continuity type taken from Figure 14 of the QFES BRC Technical Guide.




                                                 PR22428_BHAMP_199 Beddington Road, Doonan          Page 15