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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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Hazard risk and vulnerability analysis sunshine coast regional district

Hazard Risk and Vulnerability AnalysisSunshine Coast Regional District


Purpose intent

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.


Key terms

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


Methodology

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


Appendix b hazard table

APPENDIX B – Hazard Table


Appendix a risk matrix

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


Appendix e ocp spreadsheets

APPENDIX E – OCP Spreadsheets

Halfmoon Bay: 4,666 ha.


Results

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


Wild fire interface fire

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


Seismic

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.


Hazmat

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.


Landslide subsidence

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.


Debris flow rain storms

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.


Submarine slide local marine tsunami

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


Submarine slide local marine tsunami1

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.


Points for discussion

Points for Discussion


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