Hazard Mitigation Plan Dodge County, Wisconsin Plan Date – June, 2014 EPTEC, Inc. Lenora G. Borchardt 7027 Fawn Lane Sun Prairie, WI 53590-9455 608-834-0802 [email protected] Contents Table of Contents Table of Contents ............................................................................................................ 3 Acronyms ........................................................................................................................ 6 Introduction and Background .......................................................................................... 9 Previous Planning Efforts and Legal Basis ......................................................... 10 Plan Preparation, Adoption and Maintenance .................................................... 12 Physical Characteristics of Dodge County .................................................................... 18 General Community Introduction ........................................................................ 18 Plan Area ............................................................................................................ 19 Geology .............................................................................................................. 20 Topography ........................................................................................................ 22 Climate ............................................................................................................... 23 Hydrology ........................................................................................................... 25 Soil Types ........................................................................................................... 27 Wetlands ............................................................................................................ 28 Vegetation .......................................................................................................... 37 Demographics ............................................................................................................... 38 Human Settlement Patterns................................................................................ 38 Population .......................................................................................................... 39 Transportation Network ...................................................................................... 41 Land Use and Development Trends ................................................................... 42 Public Safety Support ......................................................................................... 44 Archaeological and Historical Resources ........................................................... 52 Hazard Analysis and Previous Mitigation Projects ........................................................ 55 All Hazards .................................................................................................................... 61 Vulnerability ........................................................................................................ 61 Hazard Mitigation Strategies............................................................................... 62 Drought and Dust Storms .............................................................................................. 68 Physical Characteristics ..................................................................................... 68 Frequency of Occurrence ................................................................................... 70 Vulnerability ........................................................................................................ 73 Hazard Mitigation Strategies............................................................................... 74 Earthquakes .................................................................................................................. 75 Physical Characteristics ..................................................................................... 75 Frequency of Occurrence ................................................................................... 77 Vulnerability ........................................................................................................ 80 Hazard Mitigation Strategies............................................................................... 80 Flooding and Dam Failure ............................................................................................. 81 Physical Characteristics ..................................................................................... 81 Watersheds ........................................................................................................ 86 Floodplain Regulations ....................................................................................... 89 Frequency of Occurrence ................................................................................... 90 Vulnerability ........................................................................................................ 92 Hazard Mitigation Strategies............................................................................... 93 Page 3 Contents Fires (Grassfires and Wildfires) ..................................................................................... 99 Physical Characteristics ..................................................................................... 99 Frequency of Occurrence ................................................................................. 100 Vulnerability ...................................................................................................... 100 Hazard Mitigation Strategies............................................................................. 102 Severe Temperatures .................................................................................................. 104 Characteristics .................................................................................................. 104 Physical Characteristics: Heat .......................................................................... 104 Physical Characteristics: Cold .......................................................................... 105 Frequency of Occurrence: Heat ........................................................................ 106 Frequency of Occurrence: Cold ........................................................................ 109 Vulnerability ...................................................................................................... 110 Hazard Mitigation Strategies............................................................................. 110 Sinkholes and Radon .................................................................................................. 111 Physical Characteristics ................................................................................... 111 Frequency of Occurrence ................................................................................. 112 Vulnerability ...................................................................................................... 114 Hazard Mitigation Strategies............................................................................. 115 Storms: Hail ................................................................................................................. 116 Physical Characteristics ................................................................................... 117 Frequency of Occurrence ................................................................................. 117 Vulnerability ...................................................................................................... 121 Hazard Mitigation Strategies............................................................................. 121 Storms: Lightning ........................................................................................................ 123 Physical Characteristics ................................................................................... 123 Frequency of Occurrence ................................................................................. 124 Vulnerability ...................................................................................................... 124 Hazard Mitigation Strategies............................................................................. 125 Storms: Thunderstorms ............................................................................................... 126 Physical Characteristics ................................................................................... 126 Frequency of Occurrence ................................................................................. 127 Vulnerability ...................................................................................................... 132 Hazard Mitigation Strategies............................................................................. 132 Storms: Tornadoes and High Winds............................................................................ 134 Physical Characteristics ................................................................................... 135 Frequency of Occurrence ................................................................................. 137 Vulnerability ...................................................................................................... 141 Hazard Mitigation Strategies............................................................................