Orange County Water & Wastewater Multi-Jurisdictional Hazard Mitigation Plan 2024
Exhibit O-3. IRWD Hazard Identification
Impact Primary Impact
IRWD Hazard Planning Consideration
Countywide Hazard Consideration
Total Score
Hazard Type
Probability
Affected Area
Secondary Impact
Human-Caused Hazards: Terrorism (Cyber Threat)
High
High
4
3
3
2
44.0
Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium
High High
4 4 3 4 4 4 3 4 3 2
3 2 3 2 4 4 2 2 2 1
2 2 3 2 1 1 3 1 2 3
2 3 3 3 1 1 3 2 2 4
38.4 36.0 36.0 36.0 35.2 35.2 31.2 26.4 24.0 19.6
Wildfire
Seismic Hazards: Seismic Shaking Severe Weather: Extreme Heat
Medium Medium Medium Medium Medium
Seismic Hazards: Earthquake Fault Rupture
Severe Weather: Windstorm Severe Weather: Drought
Geological Hazards: Landslide and Mudflow Human-Caused Hazards: Power Outage
High
Medium Medium
Coastal Hazards: Coastal Storm
Flood
Human-Caused Hazards: Hazardous Materials Human-Caused Hazards: Terrorism (MCI) Human-Caused Hazards: Contamination/Saltwater Intrusion Seismic Hazards: Liquefaction
Low
2
2
2
3
18.0
Low* Low* Low* Low* Low* Low* Low* Low* Low* Low*
Low Low
1
3
3
3
12.0
1
2
3
4
11.4
High
1 1 1 1 1 1 1 1
2 1 1 1 1 1 1 1
3 1 2 1 1 1 1 1
3 4 1 2 2 2 1 1
10.4
Medium
7.0 5.4 5.0 5.0 5.0 4.0 4.0
Dam/Reservoir Failure
Low
Urban Fire
Medium
Coastal Hazards: Coastal Erosion Geological Hazards: Land Subsidence Geological Hazards: Expansive Soils Coastal Hazards: Sea Level Rise
Low Low
Medium
Low
Coastal Hazards: Tsunami
Orange highlights indicate differences between hazard planning consideration levels for IRWD and the overall planning area. *Any hazards identified as a low priority for IRWD have not been analyzed nor have mitigation strategies been developed.
O-4
WSCP - 57
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