Approved Reference Documents - 132001.210127.3

Bushfire Hazard Assessment & Management Plan v2 NCES REF: J000542
Lot 9 on RP225312 — 100 Cooyar Street, Noosa Heads

 

 

3.6 Quantitative Modelling

Quantitative modelling of the potential bushfire conditions that may be experienced within the
VHC 22.1 open forest, VHC 29.2 woodland, and VHC 34.5 shrubland within the site and
adjoining the site has been undertaken to assist in determining the suitability of the
development and any asset setback requirements.

The models used comprise industry standard bushfire equations which have been built into
the FPAA endorsed FLAMESOL computer model. FLAMESOL allows numerous input
variables to be adjusted including fuel loads, fire danger index, site slope and distance to
vegetation. FLAMESOL uses the following algorithms:

e Rate of Spread — McArthur (1973) and Nobel et a/. (1980)

e Flame Length — NSW Rural Fire Service (2001) and Nobel et al. (1980)

e Elevation of Receiver — Douglas and Tan (2005)

e Flame Angle — Douglas and Tan (2005)

e Radian Heat Flux — Drysdale (1999), Sullivan et a/. (2003) and Douglas and Tan (2005)

The FLAMESOL Minimum Distance calculator has been used and comprises an AS
3959:2018 Method 2 (Appendix B) based calculator which will determine standard bushfire
behaviour variables as well as the minimum distances required to achieve a range of different
radiant heat levels (represented by BAL's).

Fuel load inputs have been drawn from Planning for Bushfire Resilient Communities (QFES
2019) based on the calculated potential fuel loads for the following;

e VHC 22.1 (23.4 tha surface and near surface fuels and 28.4 t/ha total fuels);
e VHC 29.2 (16.8 t/ha surface and near surface fuels and 24.3 t/ha total fuels); and
e VHC 34.5 (8 tha surface and near surface fuels and 13 t/ha total fuels).

A 1° effective slope was adopted for the slope underlying all Sub Units given across slope
conditions underlying the vegetation.

The default Flame Width of 100m was chosen for all units.

A Forest Fire Danger Index (FFDI) of 48 has been adopted for the site consistent with the
assignment by QFES (Catalyst 2020) (refer Plate 11).

 

+ We 100 Cooyar St, Noosa Heads, Sunshine Coast x

 

Queensland, 4567

 

3785368705.0552

647436.8637

  

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Plate 11 —FFDI (Source: QFES redi Map)
The Flamesol output results are shown in Plates 12-14.

 

 

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