Attachment 4 - Response to Further Advice Rob Friend and Associates

[14]


Table 1 - Fireline Intensity Model Data for vegetation in the northern portion
and north-eastern boundary 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)                                                     6.8 degrees
 Potential fireline intensity (kW/m)                                32,104 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.
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 Girraween 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

RFA17-040 - Bushfire Hazard Assessment & Mitigation Plan | 61 Noosa Springs Dr. Noosa Heads 30 April 2022

                                Rob Friend & Associates Pty Ltd