RFI - Attachment 7A - Response to Bushfire Issues and BMP.pdf

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  iv.   The slope was estimated using slope analysis and field data.




2. With respect to the Girraween Nature Refuge and surrounding vegetation to the north
   and east of the subject site, the area presents as a High potential bushfire intensity:
   a. The site inspection confirmed the vegetation type of the area to be analogous with
      current Regional Ecosystem mapping.
   b. Table 2 below provides the derived Potential bushfire intensity level using the
      methodology after Leonard et al (2014) and as contained in the State Planning Policy
      – Natural Hazards, Risks and Resilience – Technical Manual – A fit for Purpose
      approach in undertaking natural hazard studies and risk assessment (April 2016).

Table 2 - Fireline Intensity Model Data for vegetation in Giraween Nature Refuge
and surrounding vegetation to the east and north of the subject site

 Characteristic                                       Input/output value
 Vegetation hazard class                              9.1 Moist to dry eucalypt open forests on
                                                      coastal lowlands and ranges
 Potential fuel load (t/ha)                           24.1 t/ha
 FFDI                                                 55
 Slope (degrees)                                      5.58 degrees
 Potential fireline intensity (kW/m)                  29,963 kw/m
 Potential Bushfire Hazard Class                      High
    i.  The VHC 9.1 – moist to dry eucalypt open forests on coastal lowlands and ranges has been
        used based on the RE mapping and species observed during the site inspection.
   ii.  The Potential fuel load is attributed with a potential fuel load by the State Government after
        Leonard et al. (2014).
  iii.  The FFDI for area is determined by the State Government after Leonard et al. (2014).
  iv.   The slope was estimated using slope analysis and field data.

With regard to the radiant heat flux and the minimum setback distance necessary to achieve
an acceptable level of risk, as defined under the State Governments, Bushfire Resilience
Communities, Technical Reference Guide for the State Planning Policy (Oct 2019), using the
AS3959 Minimum Distance Calculator with an FFDI of 48, a Vegetation Hazard Class of 9.1 –
Moist to dry eucalypt open forest on coastal lowlands and ranges, a downslope characteristic
of 8 degrees and a surface fuel load of 17.2t/ha and a total fuel load of 24.2t/ha the calculations
is provided below in Table 3.




Bushfire Management Plan | Noosa Springs | RFA17-040                               24 September 2021

                                 Rob Friend & Associates Pty Ltd