Hazard Mitigation Plan 2012 Dillon County, South Carolina March 7, 2012 Revision Addressing FEMA Requirements Prepared by the Pee Dee Regional Council of Governments with the Assistance of the Dillon County Hazard Mitigation Planning Committee and the Dillon County Disaster Preparedness Agency Hazard Mitigation Plan 2012, 3-7-2012 rev 1 Dillon County TABLE OF CONTENTS Page 1.0 PLANNING PROCES................................................................................. 6 1.1 Plan Introduction………………………………………… 6 1.1.1 Disaster Mitigation Act of 2000…………………… 6 1.1.2 Parts of the Plan…………………………………… 6 1.2 Planning Process…………………………………………. 7 1.2.1 Hazard Mitigation Planning Committee………… 7 1.2.2 Involvement from Local Government…………… 9 1.2.3 Neighboring Community Involvement……………. 10 1.2.4 Local and Regional Agency Involvement………… 10 1.2.5 Public Review Process…………………………….. 10 1.2.6 Incorporated Technical Data………………………. 11 2.0 PLANNING AREA………………………………………………………… 12 2.1 General Geography……………………………………… 12 2.2 General Land Use/Development Patterns………………. 14 2.2.1 Residential Land Use…………………………….. 15 2.2.2 Commercial Land Uses…………………………. 16 2.2.3 Industrial Land Uses………………………………. 17 2.2.4 Public Semi-Private Land Uses…………………… 17 2.2.5 Agricultural, Rural and Open Spaces Uses………... 17 2.3 Transportation……………………………………………. 18 2.4 Surface Water…………………………………………….. 21 2.5 Floodplains……………………………………………….. 22 2.6 Wetlands………………………………………………….. 22 2.7 Emergency Services and Facilities………………………. 22 2.8 Parks……………………………………………………… 23 2.9 Critical Community Facilities……………………………. 23 3.0 RISK ASSESSMENT……………………………………………………… 24 3.1 Hazard Identification and Prioritization ………………… 24 3.2 Vulnerable Structures/Facilities…………………………. 25 3.3 Vulnerability and Risk Assessment by Hazard…………. 35 3.3.1 Thunderstorm/Lightning………………………… 35 3.3.2 Drought/Heat……………………………………. 42 3.3.3 Wildfire…………………………………………. 48 3.3.4 Winter Storm……………………………………. 53 3.3.5 Tornado…………………………………………. 56 3.3.6 Hurricane/Tropical Storm………………………. 65 3.3.7 Hailstorm……………………………………… 77 3.3.8 Windstorm……………………………………… 86 3.3.9 Hazardous Materials…………………………... 87 3.3.10 Flooding……………………………………… 91 3.3.11 Earthquake…………………………………… 105 3.3.12 All Hazards……………………………………. 108 Hazard Mitigation Plan 2012, 3-7-2012 rev 2 Dillon County 4.0 MITIGATION STRATEGY……………………………………………… 114 4.1 Progress Report on 2007 Mitigation Strategies………… 114 4.2 Proposed Mitigation Strategies………………………… 117 4.2.1 Thunderstorm/Lightning……………………… 117 4.2.2 Drought/Heat…………………………………… 118 4.2.3 Wildfire…………………………………………. 118 4.2.4 Winter Storm……………………………………. 118 4.2.5 Tornado…………………………………………. 119 4.2.6 Hurricane/Tropical Storm………………………. 119 4.2.7 Hailstorm……………………………………… 120 4.2.8 Windstorm………………………………………. 120 4.2.9 Hazardous Materials……………………………. 121 4.2.10 Flooding………………………………………… 121 4.2.11 Earthquake……………………………………… 122 4.2.12 All Hazards…………………………………….. 122 5.0 PLAN MAINTENANCE AND ADOPTION PROCESS…………………. 130 5.1 Plan Evaluation and Maintenance………………………. 130 5.2 Plan Implementation……………………………………. 130 5.3 Plan Coordination………………………………………. 131 5.4 Plan Adoption………………………………………….. 131 Tables 1-1 Hazard Mitigation Planning Committee……………………………………… 7 1-2 Participation of Municipalities……………………………………………….. 11 2-1 Population Distribution………………………………………………………. 13 2-2 Census County Division Population Distribution……………………………. 14 2-3 Land Use/Land Cover Classification…………………………………………. 18 2-4 Roadway Miles……………………………………………………………….. 20 3-1 HMPC Hazards Ranking Results…………………………………………….. 25 3-2 Thunderstorms With Reported Damages 1960-2009………………………… 39 3-3 Lightning/Wind Events With Reported Damages 1960-2009……………….. 40 3-4 Palmer Drought Index Severity Classes……………………………………… 42 3-5 Drought Events With Reported Damages 1960-2009……………………… 47 3-6 Drought/Heat Events With Reported Damages 1960-2009………………… 47 3-7 Wildfire Events With Reported Damages 1960-2009……………………… 48 3-8 Wildfire Extent 1946-2011………………………………………………… 49 3-9 Forest And Brush Fires 2004-2011………………………………………… 49 3-10 Winter Weather Events With Reported Damages 1960-2009……………… 56 3-11 Enhanced Fujita Tornado Scale…………………………………………….. 57 3-12 Enhanced F Scale Damage Indicators……………………………………… 57 3-13 Tornado Events With Reported Damages 1960-2009……………………… 63 3-14 Tornado Density………………………………………………………………. 63 3-15 Saffir-Simpson Hurricane Wind Scale Summary…………………………….. 67 3-16 Hurricane Events With Reported Damages 1960-2009………………………. 76 3-17 TORRO Hailstorm Intensity Scale…………………………………………… 78 3-18 Hailstorms With Reported Damages 1960-2009…………………………… 80 3-19 Pee Dee Region Windstorm Events 1988-2000………………………………. 83 3-20 Windstorms With Reported Damages 1960-2009……………………………. 86 Hazard Mitigation Plan 2012, 3-7-2012 rev 3 Dillon County 3-21 Flood Prone Areas…………………………………………………………… 94 3-22 Flood Events With Reported Damages 1960-2009…………………………. 97 3-23 Earthquake Magnitude, Intensity and Frequency Defined…………………… 106 3-24 Earthquake Magnitude-Pee Dee Region……………………………………… 106 3-25 All Hazards 1960-2009……………………………………………………….. 109 4-1 2007 Plan Mitigation Strategies Progress Report……………………………. 114 4-2 Recommended Mitigation Strategies…………………………………………. 123 Figures 2-1 General Location……………………………………………………………… 12 2-2 Population Centers…………………………………………………………… 13 2-3 Mobile Home Parks………………………………………………………….. 16 3-1 Potable Water Facilities……………………………………………………… 27 3-2 Wastewater Treatment Facililties……………………………………………. 28 3-3 Police and Fire Stations……………………………………………………… 29 3-4 Medical Care Facilities and State Buildings…………………………………. 30 3-5 Electric Power and Communications Facilities……………………………… 31 3-6 Schools………………………………………………………………………. 32 3-7 Day Care Facilities…………………………………………………………… 33 3-8 Churches……………………………………………………………………… 34 3-9 Lightning Frequency 1960-2009…………………………………………….. 41 3-10 Drought Severity Index……………………………………………………… 43 3-11 Drought Frequency 1950-2005………………………………………………. 45 3-12 SC Drought Status 2011……………………………………………………… 46 3-13 SC Drought Status 2008……………………………………………………… 46 3-14 Wildfire Events 1997-2009…………………………………………………… 51 3-15 Wildfire Frequency 1997-2009………………………………………………. 52 3-16 Winter Weather Frequency 1960-2008………………………………………. 55 3-17 SC Tornadoes 1950-2009…………………………………………………….. 60 3-18 Tornado Events 1955-2009…………………………………………………… 61 3-19 Tornado Frequency 1950-2009………………………………………………. 62 3-20 Hurricane Winds 1955-2009…………………………………………………. 73 3-21 Hurricane Tracks……………………………………………………………… 74 3-22 Hurricane Frequency 1853-2009…………………………………………… 75 3-23 Hailstorm Events 1955-2009…………………………………………………. 81 3-24 Wind Damage-Pee Dee Region By County 1955-2001……………………… 84 3-25 Hazard Material Storage Sites……………………………………………… 88 3-26 Transportation and Transmission Corridors………………………………….. 89 3-27 Hazard Material Vulnerability Points………………………………………… 90 3-28 100 Year Flood Zone…………………………………………………………. 98 3-29 Digital Flood Rate Insurance Map (DFIRM)……………………………….. 100 3-30 Little Pee Dee River Floodplain……………………………………………… 105 3-31 Earthquake Frequency 1698-2008……………………………………………. 107 3-32 SC Earthquake Faults………………………………………………………… 108 3-33 All Hazards Frequency……………………………………………………….. 110 3-34 Place Vulnerability…………………………………………………………… 112 3-35 Social Vulnerability………………………………………………………….. 113 Hazard Mitigation Plan 2012, 3-7-2012 rev 4 Dillon County APPENDIX............................................................................................................................. 133 Table A-1 Hazard Frequency Profile…………………………………………………….. 134 Table A-2 Average Annual SHELDUS Losses 1960-2009……………………………… 135 Table A-3 Critical Facilities Identified………………………………………………….. 136 Table A-4 Detailed Report On Facility Vulnerability Assessments……………………. 145 Community Survey Form…………………………………………………………………. 172 Adoption Resolutions……………………………………………………………………... 174 Hazard Mitigation Plan 2012, 3-7-2012 rev 5 Dillon County SECTION 1.0 PLANNING PROCESS 1.1 Plan Introduction This section of the Dillon County Hazard Mitigation Plan describes and documents the process used to develop the Plan. This includes how it was prepared and who was involved in the process, including participation by local governments. It also describes the time period in which the Plan was prepared, and who to contact to answer questions and make recommendation for future plan updates. 1.1.1 Disaster Mitigation Act of 2000 The first Dillon County Hazard Mitigation Plan was developed in 2004-2005 in response to the passage of the Disaster Mitigation Act of 2000 (DMA2K), and FEMA approved the Plan on April 18, 2007. On October 30, 2000, the DMA2K was signed into law by the U.S. Congress in an attempt to stem the losses from disasters, reduce future public and private expenditures, and to speed up response and recovery from disasters. This act (Public Law 106-390) amended the Robert T. Stafford Relief and Emergency Assistance Act. The following is a summary of the parts of DMA2K that pertain to local governments: • The Act establishes a new requirement for local governments to prepare and update at least every five years a Hazard Mitigation Plan in order to be eligible for funding from FEMA (Federal Emergency Management Agency) through the Pre-Disaster Mitigation Assistance Program and Hazard Mitigation Grant Program. • The Act establishes a requirement that natural hazards such as tornadoes, floods, and wildfires, need to be addressed in the risk assessment and vulnerability analysis parts of the Hazard Mitigation Plan. • The Act authorizes up to seven percent of Hazard Mitigation Grant Program funds available to a