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.
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.
– 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.
QUANTITATIVE & QUALITATIVE RESEARCH
Historical Data – climate, patterns & behaviours of past hazards
Secondary Research – existing documents & publications
Previous Assessments (general and hazard-specific) – OCPs, MoF
Halfmoon Bay: 4,666 ha.
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)
2003 : 71 fires within SCRD boundaries
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
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.
DG SPILL ‘in situ’– HSLP: Port Mellon, Granthams
Landing, Williams Landing, Gibsons at higher risk than
DG SPILL ‘in situ’ – Local: Ammonia, Propane, Diesel,
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.
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.
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.
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
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.