This page intentionally left blank TABLE OF CONTENTS Section 1 ONE Introduction ..................................................................................................................... 1-1 1.1 Overview .................................................................................................. 1-1 1.2 Hazard Mitigation Planning ..................................................................... 1-1 1.3 Disaster Mitigation Act of 2000 .............................................................. 1-1 1.4 Grant Programs With Mitigation Plan Requirements .............................. 1-2 1.4.1 Stafford Act Grant Programs ....................................................... 1-2 1.4.2 National Flood Insurance Act Grant Programs ............................ 1-2 1.5 Local Participants..................................................................................... 1-3 1.6 Community Description ........................................................................... 1-4 1.6.1 County of Ventura........................................................................ 1-4 1.6.2 Participating Cities ....................................................................... 1-7 1.6.3 Participating Special Districts ...................................................... 1-8 1.7 Description of the Hazard Mitigation Plan ............................................ 1-10 1.7.1 Section 2: Prerequisites .............................................................. 1-10 1.7.2 Section 3: Planning Process ....................................................... 1-10 1.7.3 Section 4: Hazard Analysis ........................................................ 1-11 1.7.4 Section 5: Vulnerability Analysis .............................................. 1-11 1.7.5 Section 6: Capability Assessment .............................................. 1-11 1.7.6 Section 7: Mitigation Strategy ................................................... 1-11 1.7.7 Section 8: Plan Maintenance ...................................................... 1-11 1.7.8 Section 9: References ................................................................. 1-12 Section 2 TWO Prerequisites ................................................................................................................... 2-1 2.1 Overview .................................................................................................. 2-1 Section 3 THREE Planning Process ........................................................................................................... 3-1 3.1 Overview .................................................................................................. 3-1 3.2 Initial Planning Process, 2004–2005........................................................ 3-1 3.3 Plan Update Process, 2010 ....................................................................... 3-2 3.3.1 Community Rating System Program Planning Process ............... 3-5 3.4 Public Outreach and Stakeholder Involvement ........................................ 3-6 3.4.1 Meetings ....................................................................................... 3-6 3.4.2 Media Announcements ................................................................ 3-7 3.4.3 Website ........................................................................................ 3-7 3.5 Incorporation of Existing Plans and Other Relevant Information ........... 3-7 Section 4 FOUR Hazard Analysis .............................................................................................................. 4-1 4.1 Overview .................................................................................................. 4-1 4.2 Hazard Identification and Screening ........................................................ 4-1 4.3 Hazard Profiles......................................................................................... 4-4 4.3.1 Agricultural Biological Hazards .................................................. 4-5 4.3.2 Earthquake ................................................................................... 4-7 4.3.3 Flooding: Riverine and Coastal ................................................. 4-12 i TABLE OF CONTENTS 4.3.4 Flooding: Dam Failure ............................................................... 4-16 4.3.5 Flooding: Levee Failure ............................................................. 4-20 4.3.6 Geological .................................................................................. 4-21 4.3.7 Post-Fire Debris Flow ................................................................ 4-24 4.3.8 Severe Winter Storm .................................................................. 4-30 4.3.9 Tsunami...................................................................................... 4-31 4.3.10 Wildfire ...................................................................................... 4-33 Section 5 FIVE Vulnerability Analysis .................................................................................................... 5-1 5.1 Overview .................................................................................................. 5-1 5.2 Asset Inventory ........................................................................................ 5-1 5.3 Methodology ............................................................................................ 5-2 5.4 Data Limitations ....................................................................................... 5-3 5.5 Exposure Analysis ................................................................................... 5-3 5.6 Rl Properties............................................................................................. 5-4 5.7 Summary of Impacts ................................................................................ 5-5 5.8 Future Development ................................................................................. 5-6 5.9 Natural and Beneficial Functions ............................................................. 5-7 5.10 Life/Safety Warning/Evacuation Systems ............................................... 5-9 Section 6 SIX Capability Assessment .................................................................................................. 6-1 6.1 Overview .................................................................................................. 6-1 6.2 Calema Capability Assessment Recommendations ................................. 6-1 Section 7 SEVEN Mitigation Strategy ......................................................................................................... 7-1 7.1 Overview .................................................................................................. 7-1 7.2 Mitigation Goals ...................................................................................... 7-1 7.3 Identification and Analysis of Mitigation Actions ................................... 7-2 7.4 Implementation of Mitigation Actions..................................................... 7-7 7.5 Identification and Analysis of Mitigation Actions: NFIP Compliance .............................................................................................. 7-7 Section 8 EIGHT Plan Maintenance ........................................................................................................... 8-1 8.1 Overview .................................................................................................. 8-1 8.2 Monitoring, Evaluating and Updating the Plan ....................................... 8-1 8.3 Implementation Through Existing Planning Mechanisms ....................... 8-3 8.4 Continued Public Involvement ................................................................ 8-4 Section 9 NINE References ...................................................................................................................... 9-1 ii TABLE OF CONTENTS Tables 3-1 Planning Committee 3-2 Summary of Initial Update Findings 4-1 Ventura County Hazard Screening 4-2 Modified Mercalli Intensity Scale 4-3 Date of Initially Mapped FIRM and Emergency/Regular Program Entrance Date into NFIP for Ventura County and Cities 4-4 State-Size Dams Operated by VCWPD 4-5 State-Size Dams Not Operated by the VCWPD 4-6 Non-State-Size Dams and Basins in Ventura County 4-7 Summary of Debris and Detention Basin Data for Facilities Owned by the VCWPD 4-8 Past Tsunami Run-Ups in Ventura County 4-9 Ventura County Fires of Over 1,000 Acres, 1953–2009 7-1 Mitigation Goals 7-2 Potential Mitigation Actions Figures C-1 Diversity and Location of Crops Produced in Ventura County C-2 Regional Faults and Earthquake Groundshaking Hazard Areas C-3 Flood Hazard Area: Riverine and Coastal C-4 Flood Hazard Area: Dam Failure C-5 Flood Hazard Area: Levee Failure C-6 Geologic Hazard Area: Landslide and Liquefaction C-7 Post-Fire Debris Flow Hazard Areas C-8 Post-Fire Debris Flow Hazard Areas C-9 Post-Fire Debris Flow Hazard Areas C-10 Tsunami Hazard Areas C-11 Wildland Fire Hazard Areas C-12 Population C-13 Residential Buildings (Census Blocks) C-14 Critical Facilities and Infrastructure C-15 Repetitive Loss Properties iii TABLE OF CONTENTS Appendices A FEMA Compliance Documents B Adoption Resolutions C Figures D Planning Committee E Public Outreach and Stakeholder Involvement F Plan Maintenance G Ventura County H City of Camarillo I City of Moorpark J City of Ojai K City of Oxnard L City of Port Hueneme M City of Santa Paula N City of Thousand Oaks O City of Ventura P Calleguas Municipal Water