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Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District

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a source of potential harm, or a situation with a potential for causing harm in ... Clough Creek - November 1983: destructive debris flow runs beneath Orange Rd. ... – PowerPoint PPT presentation

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Title: Hazard Risk and Vulnerability Analysis Sunshine Coast Regional District


1
Hazard Risk and Vulnerability Analysis Su
nshine 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
  • 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
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
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 (125 1100 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 activity on SCRD member municipalities.

16
Points for Discussion
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