This page intentionally left blank Table of Contents 1. Section 1 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 Community Rating System – Activity 510 Floodplain Management Planning ....... 1-2 1.5 Local Participants ..................................................................................................... 1-2 1.6 Community Profile ................................................................................................... 1-3 1.6.1 Unincorporated Ventura County................................................................... 1-3 1.6.2 Participating Cities ........................................................................................ 1-3 1.6.3 Participating Special Districts ....................................................................... 1-4 1.7 Description of the Multi-Hazard Mitigation Plan ..................................................... 1-6 1.7.1 Section 2: Record of Adoption ..................................................................... 1-6 1.7.2 Section 3: Planning Process .......................................................................... 1-6 1.7.3 Section 4: Hazard Analysis ........................................................................... 1-6 1.7.4 Section 5: Vulnerability Analysis ................................................................. 1-7 1.7.5 Section 6: Capability Assessment ................................................................. 1-7 1.7.6 Section 7: Mitigation Strategy ...................................................................... 1-7 1.7.7 Section 8: Plan Maintenance ........................................................................ 1-7 1.7.8 Section 9: References ................................................................................... 1-7 1.7.9 Appendices ................................................................................................... 1-7 1.7.10 Annex ............................................................................................................ 1-8 2. Section 2 Record of Adoption .......................................................................................................... 2-1 2.1 Overview ................................................................................................................... 2-1 2.2 Adoption Documentation .......................................................................................... 2-1 3. Section 3 Planning Process ............................................................................................................. 3-1 3.1 Overview ................................................................................................................... 3-1 3.2 MHMP Review and Revision ................................................................................... 3-1 3.2.1 MHMP Review and Recommendations ....................................................... 3-1 3.2.2 Floodplain Management Coordination with Communities and Other Agencies ....................................................................................................... 3-3 3.3 MHMP Udpate Process ............................................................................................ 3-4 3.4 Planning Committees ................................................................................................ 3-5 3.4.1 MHMP Committee ....................................................................................... 3-6 3.4.2 FMP Committee............................................................................................ 3-9 3.5 Public Outreach and Stakeholder Involvement ...................................................... 3-10 3.5.1 Multi-Media Releases ................................................................................. 3-10 3.5.2 MHMP Website .......................................................................................... 3-10 3.5.3 Online Questionnaire .................................................................................. 3-10 3.5.4 Web Portal .................................................................................................. 3-11 3.5.5 Emergency Planning Council ..................................................................... 3-11 3.5.6 Town Hall ................................................................................................... 3-11 3.5.7 Virtual Town Hall ....................................................................................... 3-11 iii Table of Contents 3.5.8 Brochure ..................................................................................................... 3-12 4. Section 4 Hazards Analysis............................................................................................................... 4-1 4.1 Overview ................................................................................................................... 4-1 4.2 Hazard Identification and Screening ........................................................................ 4-1 4.3 Hazard Profiles ......................................................................................................... 4-3 4.3.1 Agricultural Biological ................................................................................. 4-4 4.3.2 Climate Change ............................................................................................ 4-6 4.3.3 Dam Failure Inundation ................................................................................ 4-8 4.3.4 Drought ....................................................................................................... 4-11 4.3.5 Earthquake .................................................................................................. 4-14 4.3.6 Flood ........................................................................................................... 4-18 4.3.7 Landslide ..................................................................................................... 4-24 4.3.8 Levee Failure Inundation ............................................................................ 4-26 4.3.9 Post-Fire Debris Flow ................................................................................. 4-28 4.3.10 Tsunami ...................................................................................................... 4-30 4.3.11 Wildfire ....................................................................................................... 4-32 4.3.12 Winter Storm .............................................................................................. 4-35 5. Section 5 Vulnerability Analysis ....................................................................................................... 5-1 5.1 Overview ................................................................................................................... 5-1 5.2 Asset Inventory ......................................................................................................... 5-1 5.3 Methodology ............................................................................................................. 5-2 5.4 Exposure Analysis and Summary of Impacts ........................................................... 5-3 5.4.1 Summary of Impacts to Climate Change (Rising Tides Inundation Areas – 2030) ................................................................................................ 5-4 5.4.2 Summary of Impacts to Climate Change (Combined Storm Flood Hazard Zones – 2030) ................................................................................... 5-5 5.4.3 Summary of Impacts to Dam Failure Inundation ......................................... 5-6 5.4.4 Summary of Impacts to Earthquakes (Severe Ground Shaking) .................. 5-7 5.4.5 Summary of Impacts to Earthquakes (Violent Ground Shaking) ................. 5-8 5.4.6 Summary of Impacts to Earthquakes (Extreme Ground Shaking) ............... 5-9 5.4.7 Summary of Impacts to Earthquakes (Liquefaction) .................................. 5-10 5.4.8 Summary of Impacts to Flood (100-Year Flood Zone) .............................. 5-11 5.4.9 Summary of Impacts to Flood (500-Year Flood Zone) .............................. 5-13 5.4.10 Summary of Impacts to Landslides (Susceptibility Class VIII) ................. 5-14 5.4.11 Summary of Impacts to Landslides (Susceptibility Class IX) .................... 5-15 5.4.12 Summary of Impacts to Landslides (Susceptibility Class X) ..................... 5-16 5.4.13 Summary of Impacts to Levee Failure Inundation (Reduced Flood Risks Due to Levees) .................................................................................. 5-17 5.4.14 Summary of Impacts to Tsunami Inundation (Phase 3) ............................. 5-18 5.4.15 Summary of Impacts to Tsunami Inundation (Maximum Phase) ............... 5-20 5.4.16 Summary of Impacts to Wildfires (High Fire Severity Zone) .................... 5-21 5.4.17 Summary of Impacts to Wildfires (Very High Fire Severity Zone) ........... 5-22 5.5 Repetitive Loss Properties .....................................................................................