Hazard Mitigation Plan Dodge County, Wisconsin Plan Update – August 2020 EPTEC, Inc. Lenora G. Borchardt 7027 Fawn Lane Sun Prairie, WI 53590-9455 608-358-4267 [email protected] Contents Table of Contents *update when final Table of Contents ............................................................................................................ 3 Acronyms ........................................................................................................................ 6 Introduction and Background .......................................................................................... 9 Previous Planning Efforts and Legal Basis ......................................................... 10 Plan Preparation, Adoption and Maintenance .................................................... 16 Physical Characteristics of Dodge County .................................................................... 23 General Community Introduction ........................................................................ 23 Plan Area ............................................................................................................ 24 Geology .............................................................................................................. 25 Topography ........................................................................................................ 27 Climate ............................................................................................................... 28 Hydrology ........................................................................................................... 32 Soil Types ........................................................................................................... 40 Wetlands ............................................................................................................ 41 Vegetation .......................................................................................................... 51 Demographics ............................................................................................................... 52 Human Settlement Patterns................................................................................ 52 Population .......................................................................................................... 53 Transportation Network ...................................................................................... 54 Land Use and Development Trends ................................................................... 55 Public Safety Support ......................................................................................... 58 Archaeological and Historical Resources ........................................................... 65 Hazard Analysis and Previous Mitigation Projects ........................................................ 69 All Hazards .................................................................................................................... 76 Vulnerability ........................................................................................................ 76 Hazard Mitigation Strategies............................................................................... 77 Drought and Dust Storms .............................................................................................. 82 Physical Characteristics ..................................................................................... 82 Frequency of Occurrence ................................................................................... 84 Vulnerability ........................................................................................................ 86 Hazard Mitigation Strategies............................................................................... 87 Earthquakes .................................................................................................................. 89 Physical Characteristics ..................................................................................... 89 Frequency of Occurrence ................................................................................... 91 Vulnerability ........................................................................................................ 93 Hazard Mitigation Strategies............................................................................... 94 Flooding and Dam Failure ............................................................................................. 95 Physical Characteristics ..................................................................................... 95 Watersheds ...................................................................................................... 100 Floodplain Regulations ..................................................................................... 104 Frequency of Occurrence ................................................................................. 104 Vulnerability ...................................................................................................... 106 Hazard Mitigation Strategies............................................................................. 108 Page 3 Contents Fires (Grassfires and Wildfires) ................................................................................... 113 Physical Characteristics ................................................................................... 113 Frequency of Occurrence ................................................................................. 114 Vulnerability ...................................................................................................... 114 Hazard Mitigation Strategies............................................................................. 116 Severe Temperatures .................................................................................................. 118 Characteristics .................................................................................................. 118 Physical Characteristics: Heat .......................................................................... 118 Physical Characteristics: Cold .......................................................................... 119 Frequency of Occurrence: Heat ........................................................................ 121 Frequency of Occurrence: Cold ........................................................................ 122 Vulnerability ...................................................................................................... 123 Hazard Mitigation Strategies............................................................................. 124 Sinkholes and Radon .................................................................................................. 125 Physical Characteristics ................................................................................... 125 Frequency of Occurrence ................................................................................. 126 Vulnerability ...................................................................................................... 128 Hazard Mitigation Strategies............................................................................. 129 Storms: Hail ................................................................................................................. 130 Physical Characteristics ................................................................................... 131 Frequency of Occurrence ................................................................................. 131 Vulnerability ...................................................................................................... 132 Hazard Mitigation Strategies............................................................................. 133 Storms: Lightning ........................................................................................................ 134 Physical Characteristics ................................................................................... 134 Frequency of Occurrence ................................................................................. 135 Vulnerability ...................................................................................................... 135 Hazard Mitigation Strategies............................................................................. 136 Storms: Thunderstorms ............................................................................................... 137 Physical Characteristics ................................................................................... 137 Frequency of Occurrence ................................................................................. 138 Vulnerability ...................................................................................................... 138 Hazard Mitigation Strategies............................................................................. 139 Storms: Tornadoes and High Winds............................................................................ 140 Physical Characteristics ................................................................................... 141 Frequency of Occurrence ................................................................................. 143 Vulnerability ...................................................................................................... 144 Hazard Mitigation Strategies............................................................................