Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District

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Hazard Risk and Vulnerability Analysis Su
nshine Coast Regional District
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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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KEY TERMS

• 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.

HAZARD
RISK
VULNERABILITY
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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

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APPENDIX B Hazard Table
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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
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APPENDIX E OCP Spreadsheets
Halfmoon Bay 4,666 ha.
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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

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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

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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.
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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.

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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.

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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 (125 1100 annual).
• ? Clough Creek - November 1983 destructive
  debris flow runs beneath Orange Rd. and causes
  severe property damage.

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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

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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 activity on SCRD member municipalities.

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Points for Discussion