Res21 16010 final - Laserfiche WebLink

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CONTENTS Executive Summary ...............................................................................................................xix Part 1. BACKGROUND AND METHODS 1. Introduction ................................................................................................................................................ 1-1 1.1 Why Prepare This Plan? ...................................................................................................................... 1-1 1.2 Who Will Benefit from This Plan? ...................................................................................................... 1-2 1.3 How to Use This Plan .......................................................................................................................... 1-2 2. San Mateo County Hazard Mitigation Planning ..................................................................................... 2-1 2.1 Previous Plans ..................................................................................................................................... 2-1 2.2 Reasons for the 2021 Update ............................................................................................................... 2-2 2.3 Plan Changes Crosswalk ..................................................................................................................... 2-4 3. Plan Development Methodology ............................................................................................................... 3-1 3.1 Formation of the Core Planning Team ................................................................................................ 3-1 3.2 Establishment of the Planning Partnership .......................................................................................... 3-2 3.3 Defining the Planning Area ................................................................................................................. 3-3 3.4 The Steering Committee ...................................................................................................................... 3-3 3.5 Coordination with Other Agencies ...................................................................................................... 3-4 3.6 Review of Existing Programs .............................................................................................................. 3-4 3.7 Public Involvement .............................................................................................................................. 3-5 3.8 Plan Development Chronology/Milestones ....................................................................................... 3-13 4. San Mateo County Profile ......................................................................................................................... 4-1 4.1 Historical Overview ............................................................................................................................ 4-1 4.2 Physical Setting ................................................................................................................................... 4-3 4.3 Development ....................................................................................................................................... 4-6 4.4 Demographics .................................................................................................................................... 4-13 4.5 Economy ............................................................................................................................................ 4-18 5. Hazards of Concern ................................................................................................................................... 5-1 5.1 Major Past Hazard Events ................................................................................................................... 5-1 5.2 Identified Hazards of Concern ............................................................................................................. 5-2 6. Relevant Laws, Ordinances and Programs ............................................................................................. 6-1 6.1 Relevant Federal and State Agencies, Programs and Regulations ...................................................... 6-1 6.2 Local Plans, Reports and Codes .......................................................................................................... 6-6 6.3 Local Capability Assessment .............................................................................................................. 6-6 6.4 Hazard Mitigation Capabilities for Future Development .................................................................... 6-8 Part 2. RISK ASSESSMENT 7. Risk Assessment Methodology .................................................................................................................. 7-1 7.1 Risk Assessment Tools ........................................................................................................................ 7-1 7.2 Risk Assessment Approach ................................................................................................................. 7-2 7.3 Sources of Data Used in Modeling and Exposure analyses................................................................. 7-5 7.4 Limitations........................................................................................................................................... 7-6 8. Dam Failure ................................................................................................................................................ 8-1 8.1 General Background ............................................................................................................................ 8-1 v 8.2 Hazard Profile. ..................................................................................................................................... 8-3