HAZARD MITIGATION PLAN OCTOBER 2016 RECORD OF CHANGES Record of Changes Date of Revision Revision Description Section/Component Revision Completed By City of Orange October 2016 Local Hazard Mitigation Plan i RECORD OF CHANGES Page Left Intentionally Blank City of Orange Local Hazard Mitigation Plan October 2016 ii TABLE OF CONTENTS TABLE OF CONTENTS List of Tables ...................................................................................................................................... v List of Figures.................................................................................................................................... vi List of Appencies ............................................................................................................................... vi Chapter 1 – Introduction ..............................................................................................................................1 1.1 Plan Purpose.......................................................................................................................................1 1.2 Authorities..........................................................................................................................................2 1.2.1 Federal Emergency Management Agency (FEMA) .................................................................. 2 1.2.2 State of California...................................................................................................................... 2 1.3 Plan Adoption ....................................................................................................................................3 1.4 Plan Use .............................................................................................................................................5 1.5 Mitigation Priorities and Goals..........................................................................................................5 1.6 Hazard Mitigation Planning Process..................................................................................................6 1.7 Public Review Draft...........................................................................................................................9 1.8 Plans, Studies, and Technical Reports Used to Develop the Plan .....................................................9 Chapter 2 – Community Profile.................................................................................................................13 2.1 Physical Setting................................................................................................................................13 2.2 History..............................................................................................................................................13 2.3 Community Profile...........................................................................................................................15 2.4 Economic Trends .............................................................................................................................16 2.5 Existing Land Use............................................................................................................................18 2.6 Development Trends and Future Development ...............................................................................23 2.7 Critical Facilities..............................................................................................................................24 2.8 Evacuation Routes ...........................................................................................................................27 Chapter 3 – Hazards Assessment...............................................................................................................29 3.1 Hazard Identification and Prioritization...........................................................................................29 3.1.1 Hazard Identification ............................................................................................................... 29 3.1.2 Hazard Prioritization................................................................................................................ 31 3.2 Climate Change Considerations.......................................................................................................33 3.3 Vulnerability/Risk Assessment Method ..........................................................................................33 3.4 Hazard Profiles.................................................................................................................................34 City of Orange October 2016 Local Hazard Mitigation Plan iii TABLE OF CONTENTS 3.4.1 Seismic Hazards....................................................................................................................... 34 3.4.2 Wildland/Urban Fire ................................................................................................................ 50 3.4.3 Extreme Heat ........................................................................................................................... 52 3.4.4 Drought .................................................................................................................................... 54 3.4.5 Severe Weather (Wind, Rain, Lightening, Tornadoes)............................................................ 57 3.4.6 Hazardous Materials ................................................................................................................ 61 3.4.7 Landslide / Expansive Soils / Erosion ..................................................................................... 64 3.4.8 Flood Hazards .......................................................................................................................... 67 3.4.9 Terrorism.................................................................................................................................. 71 3.4.10 Dam Failure ........................................................................................................................... 71 3.4.11 Epidemic and Vector Borne Disease ..................................................................................... 77 3.5 Summary of Vulnerability ...............................................................................................................81 3.5.1 Significant Hazards.................................................................................................................. 81 3.5.2 Facilities Most at Risk ............................................................................................................. 83 3.5.3 Potential Losses ....................................................................................................................... 83 Chapter 4 – Mitigation Actions..................................................................................................................85 4.1 Hazard Mitigation Overview ...........................................................................................................85 4.1.1 FEMA National Flood Insurance Program .............................................................................. 85 4.1.2 Hazard Mitigation Goals.......................................................................................................... 86 4.1.3 Hazard Mitigation Prioritization.............................................................................................. 86 4.1.4 Hazard Mitigation Benefit – Cost Review............................................................................... 86 4.2 Hazard Mitigation Actions...............................................................................................................88 4.3 Capabilities Assessment...................................................................................................................96 4.3.1 Key Resources ......................................................................................................................... 96 4.3.2 City of Orange Fiscal Capability ........................................................................................... 101 4.3.3 Capital Improvement Projects................................................................................................ 101 Chapter 5 – Plan Maintenance .................................................................................................................103 5.1 Monitoring, Evaluating, and Updating the Plan ............................................................................103 5.1.1 Coordinating Body................................................................................................................. 103 5.1.2 Evaluation .............................................................................................................................. 103 5.2 Method and Schedule for Updating the Plan Within Five Years...................................................104 5.3 Adoption ........................................................................................................................................105 City of Orange Local Hazard Mitigation Plan October 2016 iv TABLE OF CONTENTS 5.4 Implementation through Existing Programs ..................................................................................105 5.5 Continued Public Involvement ......................................................................................................106