Hazard Mitigation Plan
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HAZARD MITIGATION PLAN FOR KENT AND OTTAWA COUNTIES (including Grand Rapids, Kentwood, and other local jurisdictions) REVISED FEMA REVIEW COPY March 2012 1 Table of Contents Executive Summary................................................................ ....................... .... 5 Introduction............................................................................ ....................... .... 16 Planning Process................................................................... ......................... .... 16 Community Profile .............................................................. .......................... .... 32 Hazard Identification and Overview .................................. .............................. 39 Severe Weather ................................................................. .............................. .. 40 Extreme Temperature. ................................................... .............................. ... 40 Thunderstorm Hazards (Hail, Lightning and Wind) . ...................................... 45 Tornadoes ......................................................................................................... .. 49 Drought .. ........................................................................................................... 54 Severe Winter Weather (Snow, Ice and Blizzard) .......................................... ... 57 Geological Events................................................................................................ 64 Shoreline Flooding and Erosion .......................................................................... 64 Landslides ............................................................................. .............................. 67 Earthquake ........................................................................................................ 69 Fire ...................................................................................................................... 72 Wildfire ............................................................................................................... 72 Urban and Structural Fire ................................................................................. .. 73 Other Fire ............................................................................................................ 75 Flooding .............................................................................................................. 77 Dam Failure Flooding.......................................................................................... 77 Riverine Flooding ................................................................................................ 81 Urban Flooding .................................................................................................... 90 Additional Flood Analysis.................................................................................... 91 Plainfield Township Flood Risks and Problems....................................................99 Robinson Township Flood Risks and Problems..................................................102 Infrastructure Failure ...........................................................................................113 Electrical Failure ................................................................................................ 113 Communications Failure .................................................................................... 114 Kent County Siren Information .......................................................................... 115 Ottawa County Siren Information ...................................................................... 116 Water System Failure ......................................................................................... 118 Sanitary Sewer Failure ........................................................................................ 119 Public Health Emergency ................................................................................... 121 Human-Related Events ...................................................................................... 124 Hazardous Material Release ............................................................................... 124 Transportation Accident ..................................................................................... 127 Nuclear Power Plant Accidents .......................................................................... 129 Intentional Acts ................................................................................................... 131 Population Trends in the Region......................................................................... 132 Risk Assessment ................................................................................................. 134 Evaluation Measures and Benchmark Factors .................................................... 134 Hazard Scoring and Hazard Ranking................................................................... 137 2 Risk Assessment Scores ...................................................................................... 138 Risk Assessment Score Ranking……...................................................................146 Hazard Summary Table – by Community ………………................................... 147 Hazard Mitigation Strategy, Goals, and Action Plan .......................................... 148 Strategy ……………............................................................................................ 148 Goals……………………………………………………………......................... 148 Action Plan and Priorities……………………..................................................... 148 General Hazard Mitigation Objectives by Jurisdiction........................................ 151 Status of Mitigation Strategies from the Original 2006 Plan .............................. 152 Flooding ……………........................................................................................... 152 Severe Weather………………………................................................................. 154 Infrastructure Failure…........................................................................................ 158 Public Health Emergency…………..................................................................... 164 Geological Events……………….......................................................................... 164 Fire…………………………................................................................................. 165 Hazard Mitigation Plan Implementation................................................................ 169 Hazard Mitigation Plan Maintenance.................................................................... 169 Public Participation…………................................................................................ 169 Integration of Hazard Mitigation Considerations into other Planning.................. 171 Local Community Subsections….......................................................................... 173 Ada Township………………................................................................................ 174 Algoma Township……………............................................................................. 175 Allendale Township……………........................................................................... 176 Alpine Township……………............................................................................... 180 Blendon Township……………............................................................................. 182 Bowne Township………………........................................................................... 183 Byron Township……………................................................................................ 185 Village of Caledonia….………............................................................................. 186 Caledonia Township…………….......................................................................... 187 Cannon Township…………….............................................................................. 188 Cascade Township……………............................................................................. 190 Village of Casnovia……………........................................................................... 191 City of Cedar Springs………................................................................................ 192 Chester Township…………….............................................................................. 193 City of Coopersville……………........................................................................... 198 Courtland Township……….….............................................................................. 199 Crockery Township……………............................................................................ 201 City of East Grand Rapids...…….......................................................................... 202 City of Ferrysburg…………….............................................................................. 203 3 Gaines Township………………............................................................................ 205 Georgetown Township…………........................................................................... 206 City of Grand Haven………….............................................................................. 208 Grand Haven Township………............................................................................. 209 City of Grand Rapids...………….......................................................................... 211 Grand Rapids Township……...............................................................................