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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 County of Orange and Orange County Fire Authority Hazard Mitigation Plan This page intentionally left blank. Page ii November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Record of Changes Date of Revision Revision Description Section/Component Revision Completed By 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 Board of Supervisors Resolution Page v November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Board of Supervisors Resolution (Continued) Page vi November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan State OES Formal Review Letter 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 FEMA Letter of Acceptance Page ix November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan This page intentionally left blank. Page x November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan Table of Contents Record of Changes ....................................................................................................................................... iii Board of Supervisors Resolution ................................................................................................................... v State OES Formal Review Letter ................................................................................................................. vii FEMA Letter of Acceptance ......................................................................................................................... ix Chapter 1 Introduction ................................................................................................................................. 1 Introduction .......................................................................................................................................... 1 Scope ..................................................................................................................................................... 1 Planning Process ................................................................................................................................... 2 Disabilities and Access and Functional Needs Working Group ............................................................. 6 Public Review ........................................................................................................................................ 6 Online Survey Results............................................................................................................................ 6 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 ...................................................................................................................... 22 3.1 Flood/Storm .................................................................................................................................. 23 3.2 Wildland/Urban Fire ..................................................................................................................... 49 3.3 Earthquake .................................................................................................................................... 69 3.4 Dam Failure ................................................................................................................................... 95 3.5 Landslide/Mud Flow/Debris Flow ............................................................................................... 101 3.6 Tsunami ....................................................................................................................................... 110 Page xi November 2015 County of Orange and Orange County Fire Authority Hazard Mitigation Plan 3.7 Drought ....................................................................................................................................... 118 3.8 Climate Change ........................................................................................................................... 124 3.9 Epidemic ...................................................................................................................................... 130 Vulnerability Assessment .................................................................................................................. 142 Chapter 4 Hazard Mitigation Strategy ...................................................................................................... 145 Multi-Hazard Goals and Action Items ............................................................................................... 145 Hazard Mitigation Plan Action Items ................................................................................................ 146 National Flood Insurance Program ................................................................................................... 155 Prioritization...................................................................................................................................... 157 Benefit Cost Review .......................................................................................................................... 157 Mitigation Action Items .................................................................................................................... 158 Chapter 5 Plan Maintenance .................................................................................................................... 165 Coordinating Body ............................................................................................................................ 165 Convener ........................................................................................................................................... 165 Adopting, Monitoring, and Updating the Hazard Mitigation Plan .................................................... 165 Incorporating Mitigation Into Existing Planning Mechanisms .......................................................... 166 Flood Event Post-Disaster Policies and Procedures / Action Items .................................................. 167 Continued Public Involvement .......................................................................................................... 170 Chapter 6 Local Capability Assessment .................................................................................................... 172 Chapter 7 Plan Resource Directory ........................................................................................................... 178 Chapter 8 Appendices ............................................................................................................................... 193 Appendix A – List of Acronyms ............................................................................................................. 194 Appendix B - Table of Maps ................................................................................................................. 198 Appendix C - List of Figures and Tables ................................................................................................. 200 Chapter 9 Attachments ............................................................................................................................
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