Town of Salisbury Hazard Mitigation Plan Salisbury, Connecticut December 2014 Table of Contents
Total Page:16
File Type:pdf, Size:1020Kb
TOWN OF SALISBURY HAZARD MITIGATION PLAN 2014 MMI #3843-04 Prepared for the: Town of Salisbury, Connecticut Salisbury Town Hall 27 Main Street Salisbury, Connecticut 06068 (860) 435-5170 www.salisburyct.us Prepared by: MILONE & MACBROOM, INC. 99 Realty Drive Cheshire, Connecticut 06410 (203) 271-1773 www.miloneandmacbroom.com The preparation of this report has been financed in part through funds provided by the Connecticut Department of Emergency Services and Public Protection (DESPP) Division of Emergency Management and Homeland Security (DEMHS) under a grant from the Federal Emergency Management Agency. The contents of this report reflect the views of the Town of Salisbury and do not necessarily reflect the official views of DEMHS. The report does not constitute a specification or regulation. Copyright 2014 Milone & MacBroom, Inc. ACKNOWLEDGEMENTS AND CONTACT INFORMATION This plan was prepared under the direction of the Town of Salisbury. The following individual should be contacted with questions or comments regarding the plan: Mr. Curtis Rand First Selectman Town of Salisbury 27 Main Street Salisbury, CT 06068 (860) 435-5170 This Natural Hazard Mitigation Plan could not have been completed without the time and dedication of the additional individuals at the local level: Mr. Don Reed – Highway Department Mr. Rodney Webb – Highway Department The consulting firm of Milone & MacBroom, Inc. (MMI) prepared the subject plan. The following individual at MMI may be contacted with questions or comments regarding the plan prior to plan adoption using the contact information on the title page or the electronic mail address below: Mr. David Murphy, P.E., CFM Associate [email protected] TOWN OF SALISBURY HAZARD MITIGATION PLAN SALISBURY, CONNECTICUT DECEMBER 2014 TABLE OF CONTENTS Page EXECUTIVE SUMMARY ....................................................................................................... ES-1 1.0 INTRODUCTION 1.1 Background and Purpose .............................................................................................................. 1-1 1.2 Hazard Mitigation Goals ............................................................................................................... 1-4 1.3 Identification of Hazards and Document Overview ..................................................................... 1-5 1.4 Discussion of STAPLEE Ranking Method ................................................................................... 1-8 1.5 Discussion of Benefit-Cost Ratio ................................................................................................ 1-10 1.6 Documentation of the Planning Process ..................................................................................... 1-10 1.7 Coordination with Neighboring Communities ............................................................................ 1-16 2.0 COMMUNITY PROFILE 2.1 Physical Setting ............................................................................................................................. 2-1 2.2 Existing Land Use ......................................................................................................................... 2-1 2.3 Geology ......................................................................................................................................... 2-4 2.4 Current Climate Conditions and Climate Change ......................................................................... 2-7 2.5 Drainage Basins and Hydrology ................................................................................................... 2-8 2.6 Population and Demographic Setting ......................................................................................... 2-11 2.7 Governmental Structure and Capabilities ................................................................................... 2-12 2.8 Development Trends ................................................................................................................... 2-12 2.9 Critical Facilities, Sheltering Capabilities, and Emergency Response Capabilities ................... 2-12 3.0 FLOODING 3.1 Setting ........................................................................................................................................... 3-1 3.2 Hazard Assessment ....................................................................................................................... 3-1 3.3 Historic Record ............................................................................................................................. 3-5 3.4 Existing Capabilities ..................................................................................................................... 3-7 3.5 Vulnerabilities and Risk Assessment .......................................................................................... 3-11 3.6 Potential Mitigation Strategies and Actions ................................................................................ 3-13 3.7 Summary of Specific Strategies and Actions .............................................................................. 3-19 4.0 HURRICANES AND TROPICAL STORMS 4.1 Setting ........................................................................................................................................... 4-1 4.2 Hazard Assessment ....................................................................................................................... 4-1 4.3 Historic Record ............................................................................................................................. 4-2 4.4 Existing Capabilities ..................................................................................................................... 4-5 4.5 Vulnerabilities and Risk Assessment ............................................................................................ 4-5 4.6 Potential Mitigation Strategies and Actions ................................................................................ 4-12 4.7 Summary of Specific Strategies and Actions .............................................................................. 4-14 TOWN OF SALISBURY HAZARD MITIGATION PLAN SALISBURY, CONNECTICUT DECEMBER 2014 TC-i TABLE OF CONTENTS (Continued) Page 5.0 SUMMER STORMS AND TORNADOES 5.1 Setting ........................................................................................................................................... 5-1 5.2 Hazard Assessment ....................................................................................................................... 5-1 5.3 Historic Record ............................................................................................................................. 5-5 5.4 Existing Capabilities ..................................................................................................................... 5-7 5.5 Vulnerabilities and Risk Assessment ............................................................................................ 5-8 5.6 Potential Mitigation Strategies and Actions ................................................................................ 5-10 5.7 Summary of Specific Strategies and Actions .............................................................................. 5-10 6.0 WINTER STORMS 6.1 Setting ........................................................................................................................................... 6-1 6.2 Hazard Assessment ....................................................................................................................... 6-1 6.3 Historic Record ............................................................................................................................. 6-3 6.4 Existing Capabilities ..................................................................................................................... 6-8 6.5 Vulnerabilities and Risk Assessment ............................................................................................ 6-8 6.6 Potential Mitigation Strategies and Actions ................................................................................ 6-10 6.7 Summary of Specific Mitigation Strategies and Actions ............................................................ 6-11 7.0 EARTHQUAKES 7.1 Setting ........................................................................................................................................... 7-1 7.2 Hazard Assessment ....................................................................................................................... 7-1 7.3 Historic Record ............................................................................................................................. 7-2 7.4 Existing Capabilities ..................................................................................................................... 7-4 7.5 Vulnerabilities and Risk Assessment ............................................................................................ 7-4 7.6 Potential Mitigation Strategies and Actions ................................................................................ 7-10 7.7 Summary of Specific Strategies and Actions .............................................................................. 7-11 8.0 DAM FAILURE 8.1 Setting ........................................................................................................................................... 8-1 8.2 Hazard Assessment ......................................................................................................................