2017 Hazard Mitigation Plan Update Calvert County, Maryland Calvert County Maryland All-Hazard Mitigation Plan June 1, 2017 Page | i 2017 Hazard Mitigation Plan Update Calvert County, Maryland This page intentionally left blank. Page | ii 2017 Hazard Mitigation Plan Update Calvert County, Maryland All-Hazard Mitigation Plan Calvert County, Maryland June 12, 2017 Prepared For: Calvert County Department of Public Safety Division of Emergency Management 175 Main Street Prince Frederick, MD 20678 Acknowledgements: This All-Hazard Mitigation Plan was prepared under the guidance of the County’s Department of Public Safety and the Division of Emergency Management with the participation of the Hazard Mitigation Steering Committee. Members of the Steering Committee are listed in Chapter 1. This plan was funded by a grant from the FEMA Pre-Disaster Mitigation Grant. This plan is an update of the original 2010 Hazard Mitigation Plan. As such, certain sections of the plan, such as the county background and geography, have been retained for continuity. Prepared By: Vision Planning and Consulting, LLC Eastern Shore Regional GIS Cooperative 8171 Maple Lawn Blvd. Salisbury University Suite 245 1101 Camden Avenue Fulton, MD 20759 Salisbury, MD 20801 Deepa Srinivasan, AICP, CFM Dr. Michael Scott, GISP 888.872.9626 410.543.6456 [email protected] [email protected] Page | iii 2017 Hazard Mitigation Plan Update Calvert County, Maryland This page intentionally left blank. Page | iv 2017 Hazard Mitigation Plan Update Calvert County, Maryland Table of Contents Acknowledgements:..................................................................................................................................... iii List of Tables .............................................................................................................................................. xi List of Figures ...........................................................................................................................................xiii Photo Credits ............................................................................................................................................ xiv CHAPTER 1: INTRODUCTION ............................................................................................................... 1 Introduction .............................................................................................................................................. 1 Background ............................................................................................................................................. 1 Mission ..................................................................................................................................................... 2 Purpose .................................................................................................................................................... 2 Scope ....................................................................................................................................................... 2 Authority and Reference ....................................................................................................................... 3 Organization of the Plan ........................................................................................................................ 3 CHAPTER 2: COMMUNITY PROFILE ................................................................................................... 5 Introduction .............................................................................................................................................. 5 Geography and Environment ............................................................................................................... 5 Physical Features ................................................................................................................................... 6 Watersheds .............................................................................................................................................. 6 Climate ...................................................................................................................................................... 6 Population and Demographics ............................................................................................................. 7 Employment and Industry Profile ......................................................................................................... 7 Economy ................................................................................................................................................... 7 Income and Poverty ................................................................................................................................ 8 Transportation ......................................................................................................................................... 9 Utilities ...................................................................................................................................................... 9 Residential Construction ....................................................................................................................... 9 Educational/Institutional ........................................................................................................................ 9 Development Trends ........................................................................................................................... 11 CHAPTER 3: PLANNING PROCESS ................................................................................................... 13 Introduction ............................................................................................................................................ 13 Update Process and Participation Summary ................................................................................... 14 Page | v 2017 Hazard Mitigation Plan Update Calvert County, Maryland Steering Committee Involvement ....................................................................................................... 15 Public & Stakeholder Participation .................................................................................................... 16 Multi-Jurisdictional Planning ............................................................................................................... 17 Public Involvement ............................................................................................................................... 18 CHAPTER 4: HAZARD IDENTIFICATION AND RISK ANALYSIS .................................................. 19 Introduction – Hazard Identification ................................................................................................... 19 Natural Hazards .................................................................................................................................... 20 Flood ....................................................................................................................................................... 20 Hurricanes and Coastal Storms .......................................................................................................... 22 Severe Thunderstorms ......................................................................................................................... 26 Tornadoes .............................................................................................................................................. 28 Drought/Extreme Heat.......................................................................................................................... 32 Hail .......................................................................................................................................................... 35 Winter Storms and Freezes ................................................................................................................. 36 Erosion .................................................................................................................................................... 36 Dam/Levee Failure................................................................................................................................ 37 Earthquakes, Sinkholes and Landslides ........................................................................................... 38 Human-Caused Hazards ..................................................................................................................... 44 Hazardous Materials (HazMat) ........................................................................................................... 44 Energy Pipeline Failures ...................................................................................................................... 44 Terrorism ................................................................................................................................................ 45 Introduction – Risk Analysis ............................................................................................................... 47 Natural Hazards .................................................................................................................................... 48 Flood ......................................................................................................................................................