Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan Yolo County, California December 2012 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan 625 Court Street, Room 202, Woodland, CA 95695 December 2012 Final Page 1 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan This Page Intentionally Blank December 2012 Final Page 2 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan Acknowledgements Yolo County would like to thank those Yolo County Operational Area collaborators and partners who participated in the planning and development of this document. The official Yolo County Operational Area Hazard Mitigation Steering Committee provided the oversight and dedication to this project that was required and without their commitment; this project would not be possible. As with any working plan, this document represents planning strategies and guidance as understood as of the date of this plan’s release. This plan identifies natural hazards and risks and identifies the hazard mitigation strategy to reduce vulnerability and make the communities of Yolo County more disaster resistant and sustainable. December 2012 Final Page 3 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan Table of Contents Acknowledgements .................................................................................................................. 3 Introduction ............................................................................................................................... 7 What’s New for the 2012 Update?................................................................................................. 7 Plan Purpose ........................................................................................................................................ 8 Plan Scope ............................................................................................................................................. 8 Hazard Mitigation Principles ......................................................................................................... 8 Plan Organization & Structure ....................................................................................................... 9 Element A: Planning Process ............................................................................................ 11 Participation and Collaboration ................................................................................................. 11 Participating Jurisdictions & Organizations .......................................................................... 11 Element A.1. Planning Process .................................................................................................... 13 Element A.2. Coordination with other Communities .......................................................... 15 Element A.3. Public Involvement ............................................................................................... 16 Element A.4. Review and Incorporation of Exiting Plans .................................................. 17 Element A.5. Plan Maintenance Process .................................................................................. 18 Element A.6. Continued Public Involvement ......................................................................... 18 Element B: Hazard Identification and Risk Assessment ......................................... 21 Hazard Analysis Process ............................................................................................................... 21 Element B.1. Hazard Descriptions ............................................................................................. 25 Element B.2 Previous Occurrences and Probability of Future Occurrences .............. 25 DAM FAILURE ............................................................................................................................................... 25 DROUGHT ....................................................................................................................................................... 33 EARTHQUAKE .............................................................................................................................................. 37 FLOOD .............................................................................................................................................................. 41 SEVERE WEATHER ..................................................................................................................................... 56 VOLCANIC ACTIVITY ................................................................................................................................. 62 WILDFIRE ....................................................................................................................................................... 63 B.3. Vulnerability Assessment .................................................................................................... 71 B.3. Estimating Potential Losses................................................................................................. 96 B.4. Repetitive Loss and Severe Repetitive Loss Properties .......................................... 105 Element C: Mitigation Strategy ....................................................................................... 107 Identification & Prioritization of Mitigation Actions ........................................................ 107 Element C.1. Existing Authorities, Policies, Programs and Resources ....................... 108 Element C.2. Participation in the National Flood Insurance Program (NFIP) ......... 111 Element C.3. Mitigation Goals .................................................................................................... 114 Element C.4. Mitigation Actions and Projects ...................................................................... 116 Element C.5. Mitigation Strategy Action Plan ...................................................................... 122 Element C.6. Project Implementation .................................................................................... 122 Element D: Plan Review, Evaluation and Implementation .................................. 125 Element D.1. Changes in Development .................................................................................. 125 Element D.2. Progress in Local Mitigation Efforts ............................................................. 125 Element D.3. Changes in Priorities .......................................................................................... 127 Element E: Plan Adoption ................................................................................................ 129 Element E.1. Formal Adoption Documentation .................................................................. 129 December 2012 Final Page 4 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan Element E.2. Yolo County Operational Area Hazard Mitigation Plan .......................... 129 References .............................................................................................................................. 131 Legal Authorities .................................................................................................................. 133 Appendices ............................................................................................................................. 135 Community Profile Information ............................................................................................... 135 Documentation of the Planning Process ............................................................................... 135 HAZUS Modeling ............................................................................................................................. 135 Formal Adoption Documents .................................................................................................... 135 December 2012 Final Page 5 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan This Page Intentionally Blank December 2012 Final Page 6 Yolo County Operational Area Multi-Jurisdictional Hazard Mitigation Plan Introduction This Local Hazard Mitigation Planning document has been prepared with the intent of establishing an inter-jurisdictional process for the development and implementation of effective hazard mitigation strategies in association with identified hazards that pose real or potential threats to the Yolo Operational Area (YOA). WHAT’S NEW FOR THE 2012 UPDATE? Overview This document is, in concept, a revision of the previous Local Hazard Mitigation Plan, composed and approved in 2005. This update represents a major refinement of the hazard mitigation planning process for Yolo County. This plan is also completely reorganized to meet FEMA’s latest planning guidance the Local Mitigation Plan Review Guide released in 2011 and implemented in 2012. The revision of the Yolo OA Multi Hazard Mitigation Plan (MHMP) has been a collaborative effort, involving various local and tribal government jurisdictions, public authorities, special districts, and selected community-based organizations that represent a broad composite of the operational area. Additionally, selected state agencies and organizations have also contributed to this planning effort, and are represented within the document by direct participation or supplemental reference. The bulk