Hazard Mitigation Plan
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HAZARD MITIGATION PLAN Town of Webster New Hampshire Adopted by the Webster Board of Selectmen July 16, 2007 HAZARD MITIGATION PLAN Town of Webster, NH July 16, 2007 Town of Webster 945 Battle Street Webster, NH 03303 Phone: (603) 648-2272 Police Department Phone: (603) 648-2200 Central NH Regional Planning Commission 28 Commercial Street Concord, NH 03301 Phone: (603) 226-6020 Web: www.cnhrpc.org NH Bureau of Emergency Management 107 Pleasant Street Concord, NH 03301 Phone: (800) 852-3792 Web: www.nh.gov/safety/divisions/emergservices/bem US Department of Homeland Security Federal Emergency Management Agency 99 High Street, Sixth Floor Boston, Massachusetts 02110 Phone: (617) 223-9540 Web: www.fema.gov Webster Hazard Mitigation Plan TABLE OF CONTENTS TABLE OF CONTENTS Certificate of Adoption ...................................................................................... vi Acknowledgements ........................................................................................... vii Chapter 1. Introduction .................................................................................... 1 Goals ....................................................................................................2 Methodology ...........................................................................................3 Chapter 2. Hazard Identification ......................................................................... 4 Natural Hazard Events in Webster .................................................................4 Technological Hazard Events in Webster..........................................................31 Human Hazard Events in Webster ..................................................................44 Evacuation Routes ....................................................................................55 Map 1: Potential Hazards ............................................................................55 Map 2: Past Hazards ..................................................................................55 Chapter 3. Asset and Risk Identification ................................................................ 56 Critical Facilities......................................................................................56 Vulnerable Populations ..............................................................................59 Economic Assets.......................................................................................60 Special Considerations ...............................................................................61 Historic/Other Considerations ......................................................................62 Future Development..................................................................................63 Homes within the Potential Flood Hazard Areas.................................................63 Map 3: Assets and Risks ..............................................................................63 Chapter 4. Potential Losses................................................................................ 64 Loss Estimation........................................................................................64 Losses by Flooding ....................................................................................65 Losses by Other Natural Hazards ...................................................................67 Losses by Technological Hazards ...................................................................72 Losses by Human Hazards ...........................................................................78 Map 4: Potential Hazards and Losses ..............................................................80 Chapter 5. Development Trends.......................................................................... 81 Population and Housing Growth ....................................................................81 Land Use................................................................................................83 Relation to Natural Hazards.........................................................................84 Page ii ADOPTED JULY 17, 2007 Webster Hazard Mitigation Plan TABLE OF CONTENTS Chapter 6. Floodplain Management ...................................................................... 86 Flooding in Webster..................................................................................86 National Flood Insurance Program .................................................................87 Repetitive Loss Properties...........................................................................88 Floodplain Management Goals/Reducing Flood Risks ...........................................88 Chapter 7. Local Hazard Mitigation Objectives ....................................................... 90 General Objectives ...................................................................................90 Hazard Specific Objectives..........................................................................91 Chapter 8. Existing Mitigation Strategies ............................................................... 92 Description of Existing Projects, Programs, and Activities.....................................92 Chapter 9. Newly Identified Mitigation Strategies ..................................................... 99 Description of Potential Mitigation Projects and Strategies ...................................99 Chapter 10. Evaluation and Implementation of Actions .............................................. 106 Webster’s Mitigation Action Plan...................................................................107 Cost to Benefit Analysis..............................................................................116 Chapter 11. Plan Monitoring, Evaluating, and Updating .............................................. 117 Maintenance and Update Schedule of the Hazard Mitigation Plan............................117 Implementation of the Plan Through Existing Programs........................................120 Continued Public Involvement ......................................................................121 Chapter 12. Appendix........................................................................................ 122 Process for Disaster Declaration in Webster......................................................122 Grant Programs for Disaster Relief.................................................................125 Action Evaluation and Prioritization Matrix of the Hazard Mitigation Committee .........127 Glossary of Terms.....................................................................................128 Publicity and Meeting Information for Webster 2007 Hazard Mitigation Plan ..............131 Page iii ADOPTED JULY 17, 2007 Webster Hazard Mitigation Plan TABLE OF CONTENTS List of Tables, Figures, and Maps: Table 1 – Significant Area Annual Events...................................................................53 Table 1A – Significant Local Annual Events ................................................................54 Table 2 – Essential Facilities .................................................................................56 Table 3 – Utilities ..............................................................................................57 Table 4 – Dams .................................................................................................57 Table 5 – Bridges ...............................................................................................58 Table 6 – Vulnerable Populations............................................................................59 Table 7 – Economic Assets....................................................................................60 Table 8 – Cemeteries and Churches.........................................................................61 Table 9 – Hazardous Materials Facilities ...................................................................61 Table 10 – Historic Sites and Buildings .....................................................................62 Table 11 – Recreational and Gathering Sites ..............................................................62 Table 12 – Future Development .............................................................................63 Table 13 – Building Value in Potential Flood Hazard Areas .............................................65 Table 14 – Overall Population and Housing Growth Trends in Webster, 1970-2000.................81 Table 15 – Population Density in Webster, 1970-2000 ...................................................82 Table 16 – Population Projections...........................................................................82 Table 17 – Residential Building Permits Issued by Housing Type, 1998 – 2003 .......................82 Table 18 – Land Use in Webster, 2004......................................................................83 Table 19 - Webster Policy and Loss Statistics, February 2006..........................................87 Table 20A - Existing Mitigation Strategies: Police Department.........................................92 Table 20B - Existing Mitigation Strategies: Fire Department ...........................................94 Table 20C - Existing Mitigation Strategies: Highway Department......................................95 Table 20D - Existing Mitigation Strategies: Army Corps of Engineers..................................96 Table 20E - Existing Mitigation Strategies: Planning Board/Code Enforcement Officer............98 Table