CITY of COLTON Local Hazard Mitigation Plan
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CITY OF COLTON Local Hazard Mitigation Plan FEMA Approved Plan June 2019 CITY OF COLTON TABLE OF CONTENTS Chapter Page Section 1. Introduction ................................................................................................................................................... 1-1 1.1 PLAN PURPOSE .............................................................................................................................................. 1-1 1.2 PLAN AUTHORITY ........................................................................................................................................... 1-2 Federal Authority ............................................................................................................................. 1-2 State Authority ................................................................................................................................. 1-2 1.3 PLAN GOALS ................................................................................................................................................... 1-3 1.4 UPDATES SINCE LAST PLAN ............................................................................................................................ 1-3 1.5 PLAN PROCESS ............................................................................................................................................... 1-3 Hazard Mitigation Planning Team .................................................................................................... 1-4 Public Engagement ........................................................................................................................... 1-5 Public Review Draft .......................................................................................................................... 1-6 Plan Revision and Adoption ............................................................................................................. 1-6 1.6 PLAN RESOURCES ........................................................................................................................................... 1-6 Section 2. Community Profile .......................................................................................................................................... 2-1 2.1 PHYSICAL SETTING ......................................................................................................................................... 2-1 2.2 HISTORY ......................................................................................................................................................... 2-1 2.3 CLIMATE ......................................................................................................................................................... 2-5 2.4 DEMOGRAPHICS ............................................................................................................................................ 2-5 2.5 ECONOMY AND COMMUTE PATTERNS ......................................................................................................... 2-7 2.6 EXISTING LAND USE ....................................................................................................................................... 2-8 2.7 DEVELOPMENT TRENDS ................................................................................................................................. 2-9 2.8 INFRASTRUCTURE ASSESSMENT .................................................................................................................... 2-9 Electricity .......................................................................................................................................... 2-9 Natural Gas ....................................................................................................................................... 2-9 Water and Wastewater .................................................................................................................. 2-10 Transportation ............................................................................................................................... 2-11 Section 3. Risk Assessment ............................................................................................................................................. 3-1 3.1 HAZARD IDENTIFICATION .............................................................................................................................. 3-1 Hazard Screening Criteria ................................................................................................................. 3-1 Hazard Prioritization ........................................................................................................................ 3-5 3.2 HAZARD PROFILES .......................................................................................................................................... 3-7 Drought Profile ................................................................................................................................. 3-7 Flood Hazard Profile ....................................................................................................................... 3-10 Geologic Hazards ............................................................................................................................ 3-21 Human-Caused Hazards ................................................................................................................. 3-26 SEISMIC Hazard Profile ................................................................................................................... 3-33 Local Hazard Mitigation Plan | June 2019 i CITY OF COLTON Severe Weather.............................................................................................................................. 3-48 Wildfire Hazard Profile ................................................................................................................... 3-53 Section 4. Threat Assessment ......................................................................................................................................... 4-1 4.1 THREAT ASSESSMENT PROCESS ..................................................................................................................... 4-1 Key Facilities ..................................................................................................................................... 4-1 Vulnerable Populations .................................................................................................................... 4-6 Other Community Assets ................................................................................................................. 4-7 4.2 THREAT PROFILES .......................................................................................................................................... 4-7 Drought ............................................................................................................................................ 4-7 Flooding ............................................................................................................................................ 4-8 Geologic Hazards ............................................................................................................................ 4-11 Human-Caused Hazards ................................................................................................................. 4-13 Seismic Hazards .............................................................................................................................. 4-15 Severe Weather.............................................................................................................................. 4-19 Wildfire ........................................................................................................................................... 4-20 Section 5. Community Capability Assessment ................................................................................................................. 5-1 Section 6. Mitigation Strategy ......................................................................................................................................... 6-1 6.1 STRATEGY DEVELOPMENT PROCESS ............................................................................................................. 6-1 Mitigation Action Foundations......................................................................................................... 6-1 Mitigation Action Evaluation ............................................................................................................ 6-1 Prioritization ..................................................................................................................................... 6-3 Cost Estimates .................................................................................................................................. 6-3 6.2 HAZARD MITIGATION ACTIONS ..................................................................................................................... 6-3 6.3 NATIONAL FLOOD INSURANCE PROGRAM .................................................................................................. 6-13 6.4 EXISTING MITIGATION MEASURES .............................................................................................................. 6-14 Section 7. Plan Maintenance ..........................................................................................................................................