Town of Canaan, New Hampshire Hazard Mitigation Plan

Town of Canaan, New Hampshire Hazard Mitigation Plan Town of Canaan Upper Valley Lake Sunapee Hazard Mitigation Regional Planning Committee Commission Prospect Hill Road – August 2008 May 2011 Update Town of Canaan, New Hampshire Hazard Mitigation Plan May 2011 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 ACKNOWLEDGEMENTS.................................................................................................................................................................... 6 II. COMMUNITY PROFILE.................................................................................................................................................................. 7 A. INTRODUCTION .......................................................................................................................................................................... 7 Geographical Location and Information............................................................................................................................................. 7 Development Trends........................................................................................................................................................................... 7 III. HAZARD IDENTIFICATION..................................................................................................................................................... 10 A. WHAT ARE THE HAZARDS IN CANAAN?............................................................................................................................ 10 B. DESCRIPTIONS OF HAZARDS................................................................................................................................................ 11 Dam Failure ...................................................................................................................................................................................... 11 Flooding ............................................................................................................................................................................................ 14 Hurricane........................................................................................................................................................................................... 17 Tornado & Downburst ...................................................................................................................................................................... 19 Thunderstorms .................................................................................................................................................................................. 21 Landslide........................................................................................................................................................................................... 22 Erosion .............................................................................................................................................................................................. 22 Severe Winter Weather..................................................................................................................................................................... 23 Earthquake ........................................................................................................................................................................................ 27 Extreme Heat .................................................................................................................................................................................... 28 Drought ............................................................................................................................................................................................. 29 Wildfire............................................................................................................................................................................................. 30 Natural Water & Air Contaminants .................................................................................................................................................. 32 Hazardous Materials Spills ............................................................................................................................................................... 34 Terrorism........................................................................................................................................................................................... 34 Town of Canaan, New Hampshire Hazard Mitigation Plan May 2011 Update C. HAZARD RISK RATINGS......................................................................................................................................................... 35 Assessing Probability........................................................................................................................................................................ 35 Assessing Probability........................................................................................................................................................................ 36 Assessing Vulnerability .................................................................................................................................................................... 36 Assessing Risk .................................................................................................................................................................................. 37 IV. CRITICAL FACILITIES & LOCATIONS.................................................................................................................................. 39 V. DETERMINING HOW MUCH WILL BE AFFECTED................................................................................................................. 41 A. IDENTIFYING VULNERABLE FACILITIES........................................................................................................................... 41 B. IDENTIFYING VULNERABLE SPECIAL POPULATIONS.................................................................................................... 42 C. POTENTIAL LOSS ESTIMATES............................................................................................................................................... 42 Dam Failure – Low/Medium Risk - $2.8 Million Estimated Cost ................................................................................................... 42 Flooding – Medium/High Risk - $0.54 Million Estimated Cost ...................................................................................................... 42 Hurricane – Low/Medium Risk – No Recorded or Estimated Cost ................................................................................................. 42 Tornado & Downburst – High Risk – No Recorded or Estimated Cost........................................................................................... 43 Thunderstorm/Lightning/Hail – Medium/High Risk – No Recorded or Estimated Cost ................................................................. 43 Landslide - Low Risk – No Recorded or Estimated Costs ............................................................................................................... 43 Erosion – Low/Medium Risk - No Recorded or Estimated Costs.................................................................................................... 43 Severe Winter Weather – Medium/High Risk – No Recorded or Estimated Cost ........................................................................... 43 Earthquake – Medium Risk – $2.25 Million Estimated Cost ........................................................................................................... 44 Extreme Heat – Low/Medium Risk – No Recorded or Estimated Cost ........................................................................................... 44 Drought – Medium Risk – No Recorded or Estimated Cost ...........................................................................................................

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