San Diego County Multi-Jurisdictional Hazard Mitigation Plan
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MULTI-JURISDICTIONAL HAZARD MITIGATION PLAN SAN DIEGO COUNTY, CALIFORNIA Participating Jurisdictions: Carlsbad National City Chula Vista Oceanside Coronado Poway Del Mar San Diego El Cajon San Marcos Encinitas Santee Escondido Solana Beach Imperial Beach Vista La Mesa County of San Diego Lemon Grove Alpine FPD Rancho Santa Fe FPD Padre Dam MWD October 2017 ii Contents Introduction 1 1.1 Plan Description/Purpose of Plan ................................................................. 1 1.2 Plan Purpose and Authority.......................................................................... 2 1.3 Community Description ............................................................................... 3 1.3.1 The County of San Diego ................................................................ 3 1.3.2 Local Jurisdictions ........................................................................... 6 2.1 List of Participating and Non-Participating Jurisdictions .......................... 13 2.2 Description of Each Jurisdiction’s Participation in the Planning Process .. 13 3.1 Description of Planning Committee Formation ......................................... 15 3.1.1 Invitation to Participate ................................................................. 15 3.2 Name of Planning Committee and its Members ........................................ 15 3.3 Hazard Mitigation Working Group Meetings ............................................ 17 3.4 Planning Process Milestones ...................................................................... 17 3.5 Public Involvement .................................................................................... 19 3.6 Existing Plans or Studies Reviewed ........................................................... 19 4.1 Overview of the Risk Assessment Process ................................................ 21 4.1.1 Risk Assessment ............................................................................ 21 4.1.2 Profiling (Describing) Hazards ...................................................... 22 4.1.3 Identifying Assets .......................................................................... 22 4.1.4 Analyze Risk ................................................................................. 22 4.1.5 Repetitive Loss .............................................................................. 23 4.1.6 Exposure Analysis ......................................................................... 23 4.2 Hazard Identification and Screening .......................................................... 23 4.2.1 List of Hazards Prevalent in the Jurisdiction ................................. 23 4.2.2 Hazard Identification Process ........................................................ 24 4.2.3 Hazard Identification Sources ........................................................... 27 4.2.4 Non-Profiled Hazards ........................................................................ 27 4.3 Hazard Profiles ........................................................................................... 28 4.3.1 Emerging Risk – Climate Change ................................................. 28 4.3.2 Sea Level Rise, Coastal Storms, Erosion and Tsunami ................. 31 4.3.3 Dam Failure ................................................................................... 39 4.3.4 Earthquake ..................................................................................... 43 4.3.5 Flood .............................................................................................. 49 4.3.6 Rain-Induced Landslide ................................................................. 55 4.3.7 Liquefaction ................................................................................... 59 4.3.8 Structure/Wildfire Fire .................................................................. 62 4.3.9 Extreme Heat ................................................................................. 69 4.3.10 Drought/Water Supply ................................................................... 71 4.3.11 Manmade Hazards ......................................................................... 72 4.4 Vulnerability Assessment ........................................................................... 77 4.4.1 Asset Inventory ................................................................................. 77 4.4.2 Estimating Potential Exposure and Losses, and Future Development Trends ............................................................................................ 77 4.5 Multi-Jurisdictional Assessment .............................................................. 121 4.5.1 Analysis of Land Use .................................................................. 121 iii 4.5.2 Analysis of Development Trends ................................................ 121 5.1 Overview .................................................................................................. 125 5.1.1 Develop Mitigation Goals and Objectives ................................... 125 5.1.2 Identify and Prioritize Mitigation Actions ................................... 125 5.2 Regional Considerations .......................................................................... 127 5.21 County of San Diego ................................................................................ 129 5.21.1 Capabilities Assessment .............................................................. 131 5.21.2 Existing Institutions, Plans, Policies and Ordinances .................. 131 5.21.3 Fiscal Resources .......................................................................... 136 5.21.4 Goals, Objectives and Actions..................................................... 137 5.21.5 Prioritization and Implementation of Action Items ..................... 148 6.1 Monitoring, Evaluating and Updating the Plan ........................................ 151 6.1.1 Plan Monitoring ........................................................................... 151 6.1.2 Plan Evaluation ............................................................................ 151 6.1.3 Plan Updates ................................................................................ 151 6.1.4 Implementation through Existing Programs ................................ 152 6.1.5 Continued Public Involvement .................................................... 152 section 7 References ................................................................................................ 155 Appendix A: Hazard Mitigation Working Group Meeting Agendas and Summaries 1 Appendix B: Data Matrix .............................................................................................. 1 Appendix C: Implementation status............................................................................ 1 Appendix D: Survey Results for SD Multijurisdictional Hazard Mitigation Plan Revision .................................................................................................. 1 iv This page intentionally left blank v SECTION ONE Introduction INTRODUCTION Across the United States, natural and manmade disasters have led to increasing levels of death, injury, property damage, and interruption of business and government services. The impact on families and individuals can be immense and damages to businesses can result in regional economic consequences. The time, money and effort to respond to and recover from these disasters divert public resources and attention from other important programs and problems. With four presidential disaster declarations, four gubernatorial proclamations and fifteen local proclamations of emergency since 1999 San Diego County, California recognizes the consequences of disasters and the need to reduce the impacts of natural and manmade hazards. The elected and appointed officials of the County also know that with careful selection, mitigation actions in the form of projects and programs can become long-term, cost effective means for reducing the impact of natural and manmade hazards. This Multi-Hazard Mitigation Plan for San Diego County, California (the Plan), was prepared with input from county residents, responsible officials, the San Diego County Water Authority, the Alpine and Rancho Santa Fe Fire Protection Districts, the Padre Dam Municipal Water District, the San Diego Foundation, ICLEI, the California Office of Emergency Services (Cal OES) and the Federal Emergency Management Agency (FEMA). The process to develop the Plan included over a year of coordination with representatives from all of the jurisdictions in the region. The Plan will guide the region toward greater disaster resilience in harmony with the character and needs of the community. This section of the Plan includes an overview of the Plan, a discussion of the Plan’s purpose and authority, and a description of the 18 incorporated cities and the unincorporated County within the San Diego region. 1.1 Plan Description/Purpose of Plan Federal legislation has historically provided funding for disaster relief, recovery, and some hazard mitigation planning. The Disaster Mitigation Act of 2000 (DMA 2000) is the latest legislation to improve this planning process (Public Law 106-390). The new legislation reinforces the importance of mitigation planning and emphasizes planning for disasters before they occur. As such, DMA 2000 establishes a pre-disaster hazard mitigation program and new requirements for the national post-disaster Hazard Mitigation Grant Program (HMGP). Section 322 of DMA 2000 specifically addresses