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County of Orange & Orange County Fire Authority

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County of Orange & Orange County Fire Authority County of Orange & Orange County Fire Authority Local Hazard Mitigation Plan November 2015 This page intentionally left blank. County of Orange and Orange County Fire Authority Hazard Mitigation Plan Record of Changes Date of Revision Revision Description Section/Component Revision Completed By This page intentionally left blank. Page ii November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Board of Supervisors Resolution Page iii November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan This page intentionally left blank. Page iv November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan State OES Formal Review Letter Page v November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan This page intentionally left blank. Page vi November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan FEMA Letter of Acceptance Page vii November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan This page intentionally left blank. Page viii November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Table of Contents Record of Changes ........................................................................................................................................ ii Board of Supervisors Resolution.................................................................................................................. iii State OES Formal Review Letter ................................................................................................................... v FEMA Letter of Acceptance ........................................................................................................................ vii Chapter 1 Introduction ................................................................................................................................. 1 Introduction .......................................................................................................................................... 1 Scope ..................................................................................................................................................... 1 Planning Process ................................................................................................................................... 1 Disabilities and Access and Functional Needs Working Group ............................................................. 6 Public Review ........................................................................................................................................ 6 Online Survey Results ........................................................................................................................... 7 Plan Meetings ....................................................................................................................................... 7 Related Documents and Resources ...................................................................................................... 8 Chapter 2 Community Profile ....................................................................................................................... 9 History ................................................................................................................................................... 9 Geography and the Environment........................................................................................................ 11 Land Use .............................................................................................................................................. 12 Population and Demographics ............................................................................................................ 13 Employment and Industry................................................................................................................... 15 History of Disasters ............................................................................................................................. 15 Chapter 3 Risk and Vulnerability Assessment ............................................................................................ 18 Overview of the Risk Assessment Process .......................................................................................... 18 Critical Facilities and Infrastructure .................................................................................................... 19 Hazard Identification ........................................................................................................................... 20 Profile of Hazard Events ...................................................................................................................... 23 3.1 Flood/Storm .................................................................................................................................. 23 3.2 Wildland/Urban Fire ..................................................................................................................... 50 3.3 Earthquake .................................................................................................................................... 71 3.4 Dam Failure ................................................................................................................................... 97 3.5 Landslide/Mud Flow/Debris Flow ............................................................................................... 104 Page ix November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan 3.6 Tsunami ....................................................................................................................................... 113 3.7 Drought ....................................................................................................................................... 120 3.8 Climate Change ........................................................................................................................... 126 3.9 Epidemic ...................................................................................................................................... 131 Vulnerability Assessment .................................................................................................................. 143 Chapter 4 Hazard Mitigation Strategy ...................................................................................................... 147 Multi-Hazard Goals and Action Items ............................................................................................... 147 Hazard Mitigation Plan Action Items ................................................................................................ 148 National Flood Insurance Program ................................................................................................... 158 Prioritization ..................................................................................................................................... 160 Benefit Cost Review .......................................................................................................................... 160 Mitigation Action Items .................................................................................................................... 161 Chapter 5 Plan Maintenance .................................................................................................................... 168 Coordinating Body ............................................................................................................................ 168 Convener ........................................................................................................................................... 168 Adopting, Monitoring, and Updating the Hazard Mitigation Plan .................................................... 168 Incorporating Mitigation Into Existing Planning Mechanisms .......................................................... 169 Flood Event Post-Disaster Policies and Procedures / Action Items .................................................. 170 Continued Public Involvement .......................................................................................................... 173 Chapter 6 Local Capability Assessment .................................................................................................... 175 Chapter 7 Plan Resource Directory ........................................................................................................... 181 Chapter 8 Appendices ............................................................................................................................... 199 Appendix A – List of Acronyms ................................................................................................................. 199 Appendix B - Table of Maps ..................................................................................................................... 199 Appendix C - List of Figures and Tables .................................................................................................... 208 Chapter 9 Attachments ............................................................................................................................. 209 Page x November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Chapter 1 Introduction Introduction The County 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