Mc Millan_Orsini_Workshop_What is so scary about planning for bushfire

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Beyond the Edge: Australia's First National Peri-Urban Conference
La Trobe University
Oct 2013

Published in: Technology, Economy & Finance
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Mc Millan_Orsini_Workshop_What is so scary about planning for bushfire

  1. 1. What’s so scary about planning for bushfire? Workshop October 2013
  2. 2. Who are we to talk about bushfire? 2
  3. 3. What is the point? • Strategically and economically it makes sense • Victorian Bushfires Royal Commission • State Planning Policy Framework 3
  4. 4. What is the point? 4
  5. 5. Bushfire behaviour 101 5
  6. 6. 6
  7. 7. Factors affecting bushfire behaviour • Vegetation (type and structure) 7
  8. 8. Factors affecting bushfire behaviour • Topography (steep v flat) 8
  9. 9. Other factors to consider • Strategic access • Urban form that would modify the underlying vegetation (and changes bushfire behaviour) • Look at decision guidelines at Clause 52.47-3 of the VPPs Semi Managed Fuel 9
  10. 10. Scary and unfamiliar terminology Forms of bushfire attack • Ember attack • Radiant heat • Direct flame contact 10
  11. 11. Can you make some judgements? 11
  12. 12. 12
  13. 13. 13
  14. 14. 14
  15. 15. 15
  16. 16. So why do you think it is scary?
  17. 17. • The maps don’t give the answer • It is not like a flood or native vegetation • Comparing unlike things • Subjective judgements about risk acceptance
  18. 18. Overcoming our fears? • Accept the risk exists • Present information about the bushfire hazard to decision makers • Form a judgment on acceptable risk – what is the residual risk? Risk Assessment Acceptable Not Acceptable PANEL
  19. 19. Practical tools… • In most peri-urban areas we will be considering development in areas of: • lesser risk (direct development) • some risk (carefully consider and make a risk judgement) 19
  20. 20. Information Establish context • Collate information regarding the site and surrounds: • Locality and site description (aerials and plans) • Bushfire hazard information • • • • • • Bushfire Management Overlay, Bushfire Prone Area mapping Other Overlays – e.g. Environmental Significance Overlay Victorian Fire Risk Register rating Regional Bushfire Planning Assessment Fire history Any other relevant information 20
  21. 21. Information Establish context (Cont.) • Strategic justification • Why has the location been selected? • What other lesser risk locations were considered? If none, why? • Is there a structure plan (or similar) providing direction? • Does that strategic plan consider bushfire matters? • Outline of Proposal • Conceptual plan 21
  22. 22. Information Qualitative judgement/risk assessment • For sites where development needs to be carefully considered, additional information is required: • Landscape scale assessment • • • Bushfire behaviour (landscape and local scale) Access and egress both to the site and within the site Proximity of the site to a settlement or township area • Proposed bushfire protection measures • Other information that may be necessary: • • • More information on the proposal (vulnerability) Comments from Integrated Fire Management Planning/ Emergency Management Vegetation controls/management 22
  23. 23. Case Study • • • • • Vegetation, topography and other factors? What are the likely bushfire risks? Forms of bushfire attack? Mitigation measures? Relationship with other planning objectives/ requirements? • Residual risk – is it acceptable? 23
  24. 24. ‘CREATING A SAFER COMMUNITY’ For more information visit www.cfa.vic.gov.au

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