Williamson County, Illinois Multi-Hazard Mitigation Plan a 2015 Update of the 2009 Countywide MHMP Williamson County Multi-Hazard Mitigation Plan
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Williamson County, Illinois Multi-Hazard Mitigation Plan A 2015 Update of the 2009 Countywide MHMP Williamson County Multi-Hazard Mitigation Plan Multi-Hazard Mitigation Plan Williamson County, Illinois Adoption Date: -- _______________________ -- Primary Point of Contact Secondary Point of Contact Kelly Huddleston Pat Creek Coordinator Assistant Coordinator Williamson County Emergency Management Williamson County Emergency Management 407 N. Monroe, Suite 370 407 N. Monroe, Suite 370 Marion, IL 62959 Marion, IL 62959 Phone: (618) 998-2123 Phone: (618) 998-2123 Email: [email protected] Email: [email protected] i Williamson County Multi-Hazard Mitigation Plan Acknowledgements The Williamson County Multi-Hazard Mitigation Plan would not have been possible without the incredible feedback, input, and expertise provided by the County leadership, citizens, staff, federal and state agencies, and volunteers. We would like to give special thank you to the citizens not mentioned below who freely gave their time and input in hopes of building a stronger, more progressive County. Williamson County gratefully acknowledges the following people for the time, energy and resources given to create the Williamson County Multi-Hazard Mitigation Plan. Williamson County Board Jim Marlo, Chairman Brent Gentry Ron Ellis ii Williamson County Multi-Hazard Mitigation Plan Table of Contents Section 1. Introduction .............................................................................................................................. 1 Section 2. Planning Process ........................................................................................................................ 2 2.1 Timeline ......................................................................................................................................... 2 2.2 Jurisdiction Participation Information ........................................................................................... 2 2.3 Planning Team Information ........................................................................................................... 3 2.4 Public Involvement ........................................................................................................................ 4 2.5 Neighboring Community Involvement .......................................................................................... 5 2.6 Review of Technical Documents .................................................................................................... 5 2.7 Adoption by Local Government ..................................................................................................... 5 Section 3. County Profile ............................................................................................................................ 6 3.1 County Background ....................................................................................................................... 6 3.2 Demographics ............................................................................................................................... 7 3.3 Economy and Industry ................................................................................................................... 7 3.4 Land Use and Development Trends............................................................................................... 8 3.5 Climate ........................................................................................................................................ 11 3.6 Topography ................................................................................................................................. 11 3.7 Major Lakes, Rivers, and Watersheds .......................................................................................... 12 Section 4. Risk Assessment ...................................................................................................................... 14 4.1 Hazard Identification ................................................................................................................... 14 4.1.1 Existing Plans ....................................................................................................................... 14 4.1.2 National Hazard Records ..................................................................................................... 14 4.1.3 FEMA Disaster Information ................................................................................................. 15 4.1.4 Hazard Ranking Methodology ............................................................................................. 17 4.1.5 Risk Priority Index ................................................................................................................ 17 4.1.6 Jurisdictional Hazard Ranking .............................................................................................. 18 4.2 Vulnerability Assessment ............................................................................................................ 19 4.2.1 Asset Inventory .................................................................................................................... 19 4.3 Risk Analysis ................................................................................................................................ 20 4.3.1 GIS and Hazus-MH ............................................................................................................... 20 4.3.2 Tornado Hazard ................................................................................................................... 21 4.3.3 Earthquake Hazard .............................................................................................................. 28 4.3.4 Thunderstorm Hazard ......................................................................................................... 38 iii Williamson County Multi-Hazard Mitigation Plan 4.3.5 Winter Storm Hazard ........................................................................................................... 41 4.3.6 Flooding Hazard ................................................................................................................... 44 4.3.7 Hazardous Material Storage and Transportation Hazard .................................................... 51 4.3.8 Dam and Levee Failure ........................................................................................................ 58 4.3.9 Drought and Extreme Heat Hazard ..................................................................................... 61 4.3.10 Ground Failure ..................................................................................................................... 64 4.3.11 Disease Outbreaks, Epidemics, and Pandemics ................................................................... 70 Section 5. Mitigation Strategies ............................................................................................................... 75 5.1 Existing Hazard Mitigation Policies, Programs and Resources ..................................................... 75 5.1.1 Successful Mitigation Projects ............................................................................................. 75 5.1.2 National Flood Insurance Program ...................................................................................... 77 5.1.3 Jurisdiction Ordinances ....................................................................................................... 79 5.1.4 Fire Insurance Ratings ......................................................................................................... 80 5.2 Mitigation Goals .......................................................................................................................... 81 5.3 Multi-Jurisdictional Mitigation Strategies .................................................................................... 81 5.4 Prioritization of Multi-Jurisdictional Mitigation Strategies .......................................................... 90 Section 6. Plan Implementation and Maintenance .................................................................................. 94 6.1 Implementation through Existing Programs ................................................................................ 94 6.2 Monitoring, Evaluation, and Updating the MHMP ...................................................................... 94 Definitions ................................................................................................................................................... 96 Acronyms .................................................................................................................................................... 98 Appendices ................................................................................................................................................ 100 Appendix A. MHMP Meeting Minutes ................................................................................................... 101 Appendix B. Local Press Release and Newspaper Articles ..................................................................... 117 Appendix C. Adopting Resolutions ........................................................................................................ 119 Appendix D. Historical Hazards.............................................................................................................. 120 Appendix E. List of Essential Facilities...................................................................................................