Attachment C - Bushfire attack level report

Bushfire Attack Level Report v1                                                               NCES REF: J000756
Lot 17 on RP903874 – 268 Kinmond Creek Rd, Cootharaba




5.0 AS 3959:2018 BAL ASSESSMENT

AS 3959:2018 provides minimum construction requirements for assessable building works in
Designated Bushfire Prone Areas. Dwellings (and renovated parts of existing dwellings) in
Designated Bushfire Prone Areas must be built to the BAL construction standard relevant to the
dwelling as identified by AS 3959:2018.

5.1 Methodology
The BAL identified herein has been determined by using the normative procedure described in
Appendix B (Method 2) of AS 3959:2018. Table 2 describes the general steps used under AS
3959:2018 to determine the BAL.
Table 2 – Methodology

 Step     Clause       Procedure

 1        2.2.2        Determine the relevant fire danger index.

 2        2.2.3        Determine the classified vegetation type(s)

 3        2.2.4        Determine the distance of the site from the classified vegetation type(s)

 4        2.2.5        Determine the effective slope(s) under the classified vegetation type(s)

 5        2.2.6        Determine the BAL from the appropriate table (Flamesol model used).

 6        2.2.7        Determine the appropriate construction requirements.

Quantitative modelling of the potential bushfire conditions that may be experienced within the
Type A Forest vegetation located surrounding the location of the proposed dwelling has been
undertaken to identify the BAL acting on the works. The FLAMESOL Minimum Distance calculator
has been used to ascertain the BAL dimensions and comprises an AS 3959:2018 Method 2
(Appendix B) based calculator. The following input data was used to determine the BAL based
on the conditions observed during the site inspection in January 2021 and the plans presented
for assessment (refer to Table 3).
Table 3 – Input Data

 Input Parameter                                        Input Data

 Fire Danger Index                                      47 (QFES 2019)
                                                        Type A Forest – all directions
 AS 3959 Vegetation Type

 QFES Vegetation Hazard Classes and Fuel                VHC 8.1 Wet Eucalypt tall open forest (combined
 Loads                                                  surface fuels 31 t/ha and 35 t/ha total fuels)
                                                        North – 10m
 Distance of classified vegetation from
                                                        South – 10m
 building
                                                        East – 10m
 Note- The Noosa Plan allows 10m exempt                 West – 10m
 clearing for building works on Category 3
 Lots
                                                        North – 1º Upslope
 Effective slope(s) under the classified
                                                        South – 12º Downslope
 vegetation type
                                                        East – 10º Downslope
                                                        West – 1º Upslope
 Flame Width                                            100m - North, East & West, 45m – South (based on
                                                        post development (i.e. 10m exempt clearing about




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