City of Irvine
2020 Local Hazard Mitigation Plan
After hazard evaluation and the organizational changes made by the Committee, this Plan discusses 11 broad hazard types with their respective sub-categories:
Hazard Type
Sub-Categories
Aircraft Incident Dam Failure
Agricultural Pests Epidemic/Vector-Borne Disease Tree Mortality
Diseases and Pests
Drought Flooding (Sea Level Rise)
Landslide Subsidence
Geologic Hazards
Hazardous Materials Release
Mass-Casualty Incident (Terrorism) Civil Disturbance Cyber Threats Transportation Accidents Infrastructure Failure
Human-Caused Hazards
Fault Rupture Seismic Shaking Liquefaction Extreme Heat Severe Wind Rain
Seismic Hazards
Severe Weather
Wildfire
H AZARD S CORING AND P RIORITIZATION
The Committee followed FEMA guidance for hazard mitigation plans and prioritized each of the 11 hazards. In the initial step, it assigned a score of 1 to 4 for each of the 11 hazards. The four criteria are:
Probability: The likelihood that the hazard will occur in Irvine in the future.
Location: The size of the area that the hazard would affect.
Maximum probable extent: The severity of the direct damage of the hazard to Irvine.
Secondary impacts: The severity of indirect damage of the hazard to Irvine.
The Committee assigned a weighting value to each criterion, giving a higher weight to the criteria deemed more important, and multiplied the score for each criterion by weighing the factor to determine the overall score for each criterion. The weighting values were recommended by FEMA:
Probability : 2.0
Location: 0.8
Maximum probable extent : 0.7
Secondary impacts : 0.5
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