TOWN OF EAST HAVEN HAZARD MITIGATION PLAN UPDATE 2012 ADOPTED MAY 1, 2012 MMI #2731-02-1 Prepared for: TOWN OF EAST HAVEN Town Hall 200 Main Street East Haven, Connecticut 06512 (203)468–3840 http://www.townofeasthavenct.org/ Prepared by: MILONE & MACBROOM, INC. 99 Realty Drive Cheshire, Connecticut 06410 (203) 271-1773 www.miloneandmacbroom.com TABLE OF CONTENTS Section Page CONTACT INFORMATION ....................................................................................................ES-1 EXECUTIVE SUMMARY .......................................................................................................ES-2 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.................................................................... 1-10 1.5 Discussion of Benefit-Cost Ratio................................................................................... 1-12 1.6 Documentation of the Planning Process ........................................................................ 1-12 1.7 Coordination with Neighboring Communities ............................................................... 1-12 2.0 COMMUNITY PROFILE 2.1 Physical Setting ................................................................................................................ 2-1 2.2 Existing Land Use ............................................................................................................ 2-1 2.3 Geology ............................................................................................................................ 2-5 2.4 Climate ........................................................................................................................... 2-13 2.5 Drainage Basins and Hydrology .................................................................................... 2-13 2.6 Population and Demographic Setting ............................................................................ 2-16 2.7 Development Trends ...................................................................................................... 2-18 2.8 Governmental Structure ................................................................................................. 2-21 2.9 Review of Existing Plans ............................................................................................... 2-26 2.10 Review of Existing Regulations..................................................................................... 2-29 2.11 Critical Facilities, Sheltering Capacity, and Evacuation ............................................... 2-39 3.0 INLAND FLOODING 3.1 Setting .............................................................................................................................. 3-1 3.2 Hazard Assessment .......................................................................................................... 3-1 3.3 Historic Record ................................................................................................................ 3-5 3.4 Existing Programs, Policies, and Mitigation Measures ................................................... 3-7 3.5 Vulnerabilities and Risk Assessment ............................................................................. 3-12 3.5.1 Vulnerability Analysis of Private Properties ....................................................... 3-13 3.5.2 Vulnerability Analysis of Critical Facilities ........................................................ 3-21 3.5.3 Vulnerability Analysis of Areas Along Watercourses ......................................... 3-22 3.5.4 HAZUS-MH Vulnerability Analysis .................................................................... 3-23 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT JANUARY 2012; ADOPTED MAY 1, 2012 TC-i TABLE OF CONTENTS (Continued) 3.6 Potential Mitigation Measures, Strategies, and Alternatives ......................................... 3-26 3.6.1 Prevention ............................................................................................................ 3-26 3.6.2 Property Protection .............................................................................................. 3-29 3.6.3 Emergency Services ............................................................................................. 3-31 3.6.4 Public Education and Awareness ......................................................................... 3-32 3.6.5 Natural Resource Protection ................................................................................ 3-32 3.6.6 Structural Projects ................................................................................................ 3-33 3.7 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 3-35 4.0 COASTAL FLOODING AND SHORELINE CHANGE 4.1 Setting .............................................................................................................................. 4-1 4.2 Hazard Assessment .......................................................................................................... 4-4 4.3 Historic Record ................................................................................................................ 4-9 4.4 Existing Programs, Policies, and Mitigation Measures ................................................. 4-13 4.5 Vulnerabilities and Risk Assessment ............................................................................. 4-16 4.5.1 Vulnerability Analysis of Coastal Area ............................................................... 4-16 4.5.2 Vulnerability Analysis of Private Properties ....................................................... 4-18 4.5.3 HAZUS-MH Vulnerability Analysis .................................................................... 4-19 4.6 Potential Mitigation Measures, Strategies, and Alternatives ......................................... 4-20 4.7 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 4-24 5.0 HURRICANES AND TROPICAL STORMS 5.1 Setting .............................................................................................................................. 5-1 5.2 Hazard Assessment .......................................................................................................... 5-1 5.3 Historic Record ................................................................................................................ 5-4 5.4 Existing Programs, Policies, and Mitigation Measures ................................................... 5-8 5.5 Vulnerabilities and Risk Assessment ............................................................................. 5-10 5.6 Potential Mitigation Measures, Strategies, and Alternatives ......................................... 5-16 5.6.1 Prevention ............................................................................................................ 5-17 5.6.2 Property Protection .............................................................................................. 5-17 5.6.3 Public Education and Awareness ......................................................................... 5-18 5.6.4 Emergency Services ............................................................................................. 5-19 5.6.5 Structural Projects ................................................................................................ 5-19 5.7 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 5-19 6.0 SUMMER STORMS AND TORNADOES 6.1 Setting .............................................................................................................................. 6-1 6.2 Hazard Assessment .......................................................................................................... 6-1 6.3 Historic Record ................................................................................................................ 6-6 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT JANUARY 2012; ADOPTED MAY 1, 2012 TC-ii TABLE OF CONTENTS (Continued) 6.4 Existing Programs, Policies, and Mitigation Measures ................................................... 6-8 6.5 Vulnerabilities and Risk Assessment ............................................................................. 6-10 6.6 Potential Mitigation Measures, Strategies, and Alternatives ......................................... 6-11 6.7 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 6-12 7.0 WINTER STORMS AND NOR'EASTERS 7.1 Setting .............................................................................................................................. 7-1 7.2 Hazard Assessment .......................................................................................................... 7-1 7.3 Historic Record ................................................................................................................ 7-2 7.4 Existing Programs, Policies, and Mitigation Measures ................................................... 7-6 7.5 Vulnerabilities and Risk Assessment ............................................................................... 7-7 7.6 Potential Mitigation