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Town of Hanover, New Hampshire Hazard Mitigation Plan

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Town of Hanover, New Hampshire Hazard Mitigation Plan Town of Hanover, New Hampshire Hazard Mitigation Plan Town of Hanover Upper Valley Lake Sunapee Hazard Mitigation Regional Planning Committee Commission East Wheelock Street, June 10, 2005 2009 Town of Hanover, New Hampshire Hazard Mitigation Plan February 2009 PLAN UPDATE TABLE OF CONTENTS I. INTRODUCTION .............................................................................................................................................................................. 1 A. BACKGROUND ............................................................................................................................................................................ 1 B. PURPOSE....................................................................................................................................................................................... 1 C. HISTORY ....................................................................................................................................................................................... 1 D. SCOPE OF THE PLAN.................................................................................................................................................................. 2 E. METHODOLOGY ......................................................................................................................................................................... 2 F. HAZARD MITIGATION GOALS................................................................................................................................................. 5 G. ACKNOWLEDGEMENTS............................................................................................................................................................ 7 II. COMMUNITY PROFILE .................................................................................................................................................................. 8 A. INTRODUCTION .......................................................................................................................................................................... 8 Geographical Location and Information............................................................................................................................................. 8 Development Trends........................................................................................................................................................................... 8 III. HAZARD IDENTIFICATION..................................................................................................................................................... 12 A. WHAT ARE THE HAZARDS IN HANOVER? ......................................................................................................................... 12 B. DESCRIPTIONS OF HAZARDS ................................................................................................................................................ 13 Dam Failure ...................................................................................................................................................................................... 13 Flooding ............................................................................................................................................................................................ 16 Hurricane........................................................................................................................................................................................... 19 Tornado & Downburst ...................................................................................................................................................................... 22 Thunderstorms .................................................................................................................................................................................. 23 Erosion .............................................................................................................................................................................................. 24 Severe Winter Weather..................................................................................................................................................................... 26 Earthquake ........................................................................................................................................................................................ 29 Drought ............................................................................................................................................................................................. 30 Wildfire............................................................................................................................................................................................. 31 Natural Water & Air Contaminants .................................................................................................................................................. 32 Hazardous Materials Spills ............................................................................................................................................................... 34 Terrorism........................................................................................................................................................................................... 35 Public Health and Infectious Disease ............................................................................................................................................... 36 C. HAZARD RISK RATINGS ......................................................................................................................................................... 37 Town of Hanover, New Hampshire Hazard Mitigation Plan February 2009 PLAN UPDATE Assessing Probability........................................................................................................................................................................ 37 Assessing Vulnerability .................................................................................................................................................................... 38 Assessing Risk .................................................................................................................................................................................. 39 IV. CRITICAL FACILITIES & LOCATIONS.................................................................................................................................. 41 V. DETERMINING HOW MUCH WILL BE AFFECTED................................................................................................................. 46 A. IDENTIFYING VULNERABLE FACILITIES........................................................................................................................... 46 B. IDENTIFYING VULNERABLE SPECIAL POPULATIONS.................................................................................................... 47 C. POTENTIAL LOSS ESTIMATES............................................................................................................................................... 47 Dam Failure – Low/Medium Risk - $6.4 Million Estimated Cost ................................................................................................... 47 Flooding – Low/Medium Risk - $9 Million Estimated Cost ............................................................................................................ 47 Hurricane – High Risk – No Recorded or Estimated Cost ............................................................................................................... 48 Tornado & Downburst – High Risk – No Recorded or Estimated Cost........................................................................................... 48 Thunderstorm/Lightning/Hail – Low/Medium Risk – No Recorded or Estimated Cost.................................................................. 48 Severe Winter Weather – High Risk – $15 Million Estimated Cost ................................................................................................ 48 Earthquake – Low/Medium Risk – $186 Million Estimated Cost.................................................................................................... 48 Drought – Low/Medium Risk – No Recorded or Estimated Cost.................................................................................................... 49 Wildfire – Low/Medium Risk – No Recorded or Estimated Cost.................................................................................................... 49 Natural Contaminants – Low/Medium Risk – No Recorded or Estimated Cost .............................................................................. 49 Hazardous Material Spills – Medium/High Risk – No Recorded or Estimated Cost....................................................................... 49 VI. EXISTING MITIGATION ACTIONS......................................................................................................................................... 51 VII. GOALS AND NEWLY IDENTIFIED MITIGATION ACTIONS.............................................................................................. 55 A. GOALS & OBJECTIVES............................................................................................................................................................
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