Public Works Department 38250 Sierra Highway Palmdale, CA 93550 661-267-5300 661-267-5292(fax) www.cityofpalmdale.org LOCAL HAZARD MITIGATION PLAN September 30, 2016 (update per FEMA Comments) (5 year update 2016-2021) ____________________________________________________________________________________________________________________ City of Palmdale Local Multihazard Mitigation Plan 1 CITY OF PALMDALE LOCAL HAZARD MITIGATION PLAN – 2016 - 2021 UPDATE Table of Contents SECTION PAGE Adoption Resolution ......................................................................................................Under cover Title Page ....................................................................................................................... 1 Table of Contents ............................................................................................................2 Acknowledgements .........................................................................................................7 Executive Summary .........................................................................................................7 SECTION ONE – BACKGROUND & COMMUNITY PROFILES 1.1 Definition of Hazard Mitigation ........................................................................11 1.2 Why Develop a Hazard Mitigation Plan ............................................................12 1.3 Purpose of the Plan ............................................................................................16 1.4 General Planning Requirements in California ...................................................16 1.5 Community Profile: ...........................................................................................17 1.6 Public Services and Infrastructure .....................................................................20 1.7 Analysis of Development Trends.......................................................................25 SECTION TWO – PLANNING PROCESS 2.1 Overview of Planning Process ...........................................................................29 2.2 Participation in the Planning Process .................................................................30 2.3 Incorporation of Existing Plans, Studies, and Technical Information ...............32 2.4 Public and Shareholder Involvement .................................................................34 2.5 Local Capabilities and Resources……………………………………………..37 SECTION THREE – RISK ASSESSMENT 3.1 Risk Assessment Process ...................................................................................40 3.2 Identifying Hazards ............................................................................................40 3.3 Profiling Hazards ...............................................................................................42 Earthquake .......................................................................................................42 Previous Occurrences.........................................................................................45 Probability of Future Events ..............................................................................49 ____________________________________________________________________________________________________________________ City of Palmdale Local Multihazard Mitigation Plan –5 year update 2016-2021 2 SECTION PAGE Earthquake Related Hazards ..............................................................................51 Floods, Dam Failure and Inundation Hazards .............................................52 Flood Hazard ......................................................................................................52 Previous Occurrences.........................................................................................55 Probability of Future Events ..............................................................................56 Wildfire Hazards/Brush Fires ........................................................................56 Wildfire/Brush Fire ............................................................................................56 Previous Occurrences.........................................................................................57 Probability of Future Events ..............................................................................62 Transportation Accident/Hazmat Spill ..........................................................66 Transportation Accident/ Hazardous Materials Release ....................................66 Previous Occurrences and Probability of Future Events ...................................66 Drought .............................................................................................................68 What is Drought .................................................................................................68 Previous Occurrences.........................................................................................68 Impacts of Drought ............................................................................................69 Mitigation of the Impacts of Drought ................................................................69 Probability of Future Events ..............................................................................70 Severe Weather ................................................................................................70 Severe Weather Hazard ......................................................................................70 Previous Occurrences.........................................................................................70 Probability of Future Events ..............................................................................75 Power/Utility Failure .......................................................................................74 Introduction ........................................................................................................74 Previous Occurrences.........................................................................................75 Probability of Future Events ..............................................................................75 3.4 Inventorying Assets ...........................................................................................75 City-Owned Assets ............................................................................................75 Privately-Owned Assets .....................................................................................75 Identification of Critical Infrastructure and Facilities .......................................77 3.5 Assessing Vulnerability and Estimating Potential Losses .................................79 Overview ............................................................................................................79 Earthquake .......................................................................................................81 Vulnerability of Critical Public Infrastructure and Facilities ............................85 Estimating Potential Losses ...............................................................................86 ____________________________________________________________________________________________________________________ City of Palmdale Local Multihazard Mitigation Plan –5 year update 2016-2021 3 SECTION PAGE Flood, Dam Failure and Inundation...............................................................90 Vulnerability Assessment ..................................................................................90 Estimating Potential Losses ...............................................................................93 Wildfires/Brush Fires ......................................................................................93 Vulnerability Assessment ..................................................................................93 Estimating Potential Losses ...............................................................................95 Transportation Accident/Hazmat Spill .........................................................99 Introduction ...................................................................................................... 99 Vulnerability Assessment ................................................................................101 Estimating Potential Losses .............................................................................106 Drought ...........................................................................................................106 Vulnerability Assessment ................................................................................106 Estimating Potential Losses .............................................................................106 Severe Weather ..............................................................................................107 Vulnerability Assessment ................................................................................107 Estimating Potential Losses .............................................................................107 Power/Utility Failure .....................................................................................107 Vulnerability Assessment ................................................................................107 Estimating Potential Losses .............................................................................108 3.6 Analyzing Development Trends ......................................................................111