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Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District

Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District. PURPOSE & INTENT.  Hazard identification and gap analysis.  HRVA as a key component of an emergency plan.  Tool to help orient resource allocation, land use planning alternatives, support future funding applications.

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Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District

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  1. Hazard Risk and Vulnerability AnalysisSunshine Coast Regional District

  2. PURPOSE & INTENT Hazard identification and gap analysis. HRVA as a key component of an emergency plan. Tool to help orient resource allocation, land use planning alternatives, support future funding applications.

  3. KEY TERMS HAZARD – a source of potential harm, or a situation with a potential for causing harm in terms of human injury, damage to health, property, the environment, and/or other things of value. – the chance of injury or loss as defined as a measure of the probability [likelihood] and severity or an adverse effect to health, property, the environment, or other things of value. – people, property, infrastructure, industry and resources, or environments that are particularly exposed to adverse impact from a hazard event. RISK VULNERABILITY

  4. METHODOLOGY QUANTITATIVE & QUALITATIVE RESEARCH  Survey Data  Historical Data – climate, patterns & behaviours of past hazards  Secondary Research – existing documents & publications  Previous Assessments (general and hazard-specific) – OCPs, MoF  Observation

  5. APPENDIX B – Hazard Table

  6. Severity APPENDIX A – Risk Matrix Frequency Mod. Low High Very High 6 Very Likely 5 Moderate/Likely 4 Occasional/Slight Chance 3 Unlikely/Improbable 2 Highly Unlikely/Rare 1 Rare 8 16 24 32

  7. APPENDIX E – OCP Spreadsheets Halfmoon Bay: 4,666 ha.

  8. RESULTS STRUCTURAL FIRE / URBAN FIRE  High potential for injury, fatality  High potential for damage to critical infrastructure & property  Adjacency – potential to damage lifelines (marinas, ferry terminal, etc)  High frequency

  9. WILD FIRE/INTERFACE FIRE  2003 : 71 fires within SCRD boundaries • 10.3 ha. • 54 lighting (76%) • 17 human carelessness(MoF, 2005)  Most areas in SCRD moderate risk  Extreme: Gambier & Keats Island, Sakinaw Lk.  High: Halfmoon Bay, Pender Harbour (Garden Bay – Pender Hill), Roberts Creek North, Williams Landing  Currently no updated fire hazard mapping (last done in 1999)  Limited fire suppression capabilities, water coverage in peripheral areas, fuel loading, access for emergency vehicles

  10. SEISMIC  Coastal BC & lower mainland very active – high frequency  Impact critical infrastructure  Significant potential for property damage, injury, fatality  Overall high risk – mitigation is difficult *For Vancouver. Onur & Seeman, 2004.

  11. HAZMAT  DG SPILL ‘in situ’– HSLP: Port Mellon, Granthams Landing, Williams Landing, Gibsons at higher risk than Roberts Creek.  DG SPILL ‘in situ’ – Local: Ammonia, Propane, Diesel, etc.  DG SPILL– Transport Routes: (waterways, highways) Response capability limited to containment & evacuation - SCRD and member municipalities rely on external agencies. Environmental impact, economic impact, health implications, are high.

  12. LANDSLIDE / SUBSIDENCE January 2005 – heavy rains and soil saturation force evacuation of one household in Gibsons January 2005 – two homes in Halfmoon Bay affected by land subsidence (slumping) Extensive gravel mining and resource extraction in various areas of SCRD (Appendices E), prevalence of soft soils.

  13. DEBRIS FLOW / RAIN STORMS  Chapman Creek - early 1980s: serious flood along Chapman Creek alluvial fan results from high creek flows, high tides, storm wave action.  Charman Creek -subject to high flood and debris flood hazards (1:25 – 1:100 annual).  Clough Creek - November 1983: destructive debris flow runs beneath Orange Rd. and causes severe property damage.

  14. SUBMARINE SLIDE (local marine tsunami) Anderson, P. & Gow, G. PSEPC. (2004). Rabinovich et. al., Canadian Hydrographic Service. (2003). Infrequent and difficult to detect Most commonly triggered by non-seismic events (abnormally low tides, coastal construction, heavy rainfall, strong winds, atmospheric pressure changes, sudden soil deposition) Slippage of a 1,250,000 m³ sediment lobe (the smaller of two) on Eastern shore of Texada Island would likely cause approx. 2m waves. Potentially impact Irvines Landing, Pope Landing, Donnelly Bay, Garden Bay, Madeira Park

  15. SUBMARINE SLIDE (local marine tsunami)  Low probability – close proximity (lead wave transiting Malaspina Strait and arriving at Cape Cockburn in 132 sec.)  Emergent field in geophysical and disaster research – study not intended to be used as hazard assessment tool.  Situational awareness & proactive planning – wise to consider potential impact of submarine slide activityon SCRD & member municipalities.

  16. Points for Discussion

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