The 90 SRAs identified as having a high-risk score were further analysed using spatial overlays and ratios. This information built on the attribution of risk based on SA1s and ultimately facilitated identification of the SRAs for which CFA advice is required, using automated and manual methods.
5.1 Final decision support analysis
The final DSA workflow is computed in four steps with the SRAs as the base unit of analysis,16 using a process similar to that explained in Section 3. Each SRA contains all the ratios and overlays outlined in Sections 4.1 to 4.3, which are presented in Table 1.
Table 1 Final decision support analysis criteria, threshold, and influence for 90 station response areas
| Final DSA ratios and overlays | Minimum threshold | Maximum threshold | Influence | Unit |
|---|---|---|---|---|
| Building fire casualties to total building fire ratio | 0.05 | 0.24 | Positive | Ratio |
| Vehicle fire/MVA casualties to total vehicle fire/MVA ratio | 0.19 | 0.59 | Positive | Ratio |
| Proportion of SRA that is bushfire management overlay (BMO) | 0 | 80.86 | Positive | % of SRA |
| Proportion of SRA in each VPA Planning project category | 0 | 100 | Positive | % of SRA |
| Sum of population projections (2036) | 4,449 | 198,680 | Positive | Count |
5.2 Manual selection
To conduct the manual selection process, the ratios and overlays presented in Table 1 were applied to all 90 SRAs. Drawing on the resulting calculations, the SRAs were ranked from highest to lowest according to both ratios and overlays to identify which SRAs were most impacted by these factors. Finally, SRAs that contained high proportions of the identified overlays and high ratio scores were selected for CFA advice.
Interpretation of the final list has been guided by the Index of Relative Socio-economic Disadvantage and general information regarding the localities the station response areas service, including their dominant land use, presence of infrastructure, and population increases that act as potential drivers of fire risk.
Footnotes
[16] Previous DSA application used SA1 as the base unit for analysis
Updated