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Sitka Mitigation Plan

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Sitka Mitigation Plan Work Session: Continuation of Sitka local hazard mitigation plan project development -Maegan Bosak and Jill Missal CBS Hazard Mitigation Plan Draft 2018 UPDATE JUNE 18, 2018 1-1 City and Borough of Sitka All-Hazards Mitigation Plan TABLE OF CONTENTS 1 INTRODUCTION ........................................................................................................................1 -1 1.1 Purpose ................................................................................................................................ 1-1 1.2 What is Hazard Mitigation? ................................................................................................. 1-1 1.3 Scope ................................................................................................................................... 1-2 1.4 Roles and Responsibilities ................................................................................................... 1-3 1.4.1 Plan Implementation ........................................................................................... 1-3 1.4.2 Monitoring, Evaluating and Updating the Plan ................................................... 1-3 1.4.3 Monitoring the Plan ............................................................................................ 1-3 1.4.4 Evaluating the Plan .............................................................................................. 1-3 1.4.5 Updating the Plan ................................................................................................ 1-4 1.5 Plan Organization ................................................................................................................ 1-5 1.6 What’s New in the 2018 Update? ....................................................................................... 1-5 2 PLANNING PROCESS ..................................................................................................................2 -1 2.1 Planning Area ....................................................................................................................... 2-1 2.2 Data Collection and Incorporation of Existing Plans ........................................................... 2-2 2.3 Coordination with Other Planning Efforts ........................................................................... 2-2 2.4 Mitigation Planning Team ................................................................................................... 2-2 2.5 Local Emergency Planning Committee ................................................................................ 2-3 2.6 Outreach and Public Involvement ....................................................................................... 2-3 3 COMMUNITY PROFILE ...............................................................................................................3 -1 3.1 Community History .............................................................................................................. 3-1 3.2 Culture and Demographics .................................................................................................. 3-1 3.2.1 Vulnerable Populations ....................................................................................... 3-1 3.3 Economy .............................................................................................................................. 3-1 3.4 Infrastructure....................................................................................................................... 3-1 3.5 Critical Facilities ................................................................................................................... 3-2 3.5.1 Estimating Potential Dollar Losses ...................................................................... 3-6 3.6 Transportation ..................................................................................................................... 3-7 3.7 Environment and Topography ............................................................................................. 3-8 3.7.1 Climate ................................................................................................................. 3-8 3.7.2 Vegetation and Soil ............................................................................................. 3-8 4 HAZARD PROFILES AND RISK/VULNERABILITY ASSESSMENT ....................................................... 4-9 4.1 General ................................................................................................................................ 4-9 4.2 Hazard Ranking Methodology ........................................................................................... 4-10 4.3 Hazard-Specific Profiles and Risk Assessments ................................................................. 4-11 4.3.1 Flood .................................................................................................................. 4-11 4.4 Earthquake ........................................................................................................................ 4-16 i City and Borough of Sitka All-Hazards Mitigation Plan 4.4.1 Earthquake Impact ............................................................................................ 4-18 4.4.2 Earthquake Probability ...................................................................................... 4-18 4.4.3 Earthquake History ............................................................................................ 4-19 4.4.4 Earthquake Location .......................................................................................... 4-20 4.4.5 Earthquake Vulnerability ................................................................................... 4-21 4.5 Tsunami ............................................................................................................................. 4-23 4.5.1 Tsunami Description .......................................................................................... 4-23 4.5.2 Tsunami Impact ................................................................................................. 4-25 4.5.3 Probability ......................................................................................................... 4-26 4.5.4 Tsunami History ................................................................................................. 4-26 4.5.5 Tsunami Location .............................................................................................. 4-27 4.5.6 Tsunami Vulnerability ........................................................................................ 4-27 4.6 Severe Weather ................................................................................................................. 4-27 4.6.1 Severe Weather Impact ..................................................................................... 4-27 4.6.2 Severe Weather Probability .............................................................................. 4-27 4.6.3 Severe Weather History .................................................................................... 4-28 4.6.4 Severe Weather Location .................................................................................. 4-29 4.7 Landslide/Ground Failure .................................................................................................. 4-29 4.7.1 Landslide Probability ......................................................................................... 4-29 4.7.2 Landslide History ............................................................................................... 4-29 4.7.3 Landslide Location/Landslide Vulnerability ....................................................... 4-30 4.8 Hazards Classified as “Negligible” ..................................................................................... 4-30 4.8.1 Erosion ............................................................................................................... 4-30 4.8.2 Wildland Fire ..................................................................................................... 4-30 4.8.3 Avalanche .......................................................................................................... 4-30 4.8.4 Volcano .............................................................................................................. 4-30 4.9 Impacts of Global Climate Change .................................................................................... 4-30 5 CAPABILITY ASSESSMENT ..........................................................................................................5 -1 5.1.1 Government ........................................................................................................ 5-1 5.1.2 Local Resources ................................................................................................... 5-1 5.1.3 State Resources ................................................................................................... 5-3 5.1.4 Federal Resources ............................................................................................... 5-4 5.1.5 Other Funding Sources and Resources ................................................................ 5-6 6 MITIGATION GOALS AND STRATEGIES .......................................................................................6 -1 6.1 Mitigation Goals .................................................................................................................. 6-1 6.2 Mitigation Actions ..............................................................................................................
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