Town of East Haven Hazard Mitigation Plan Update 2012

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 <a href="/goto?url=http://www.townofeasthavenct.org/" target="_blank">http://www.townofeasthavenct.org/ </a>Prepared by: MILONE & MACBROOM, INC. 99 Realty Drive Cheshire, Connecticut 06410 (203) 271-1773 <a href="/goto?url=http://www.miloneandmacbroom.com" target="_blank">www.miloneandmacbroom.com </a>TABLE OF CONTENTS <ul style="display: flex;"><li style="flex:1">Section </li><li style="flex:1">Page </li></ul>CONTACT INFORMATION....................................................................................................ES-1 EXECUTIVE SUMMARY .......................................................................................................ES-2 <ul style="display: flex;"><li style="flex:1">1.0 </li><li style="flex:1">INTRODUCTION </li></ul>1.1 1.2 1.3 1.4 1.5 1.6 1.7 Background and Purpose ................................................................................................. 1-1 Hazard Mitigation Goals.................................................................................................. 1-4 Identification of Hazards and Document Overview ........................................................ 1-5 Discussion of STAPLEE Ranking Method.................................................................... 1-10 Discussion of Benefit-Cost Ratio................................................................................... 1-12 Documentation of the Planning Process ........................................................................ 1-12 Coordination with Neighboring Communities............................................................... 1-12 <ul style="display: flex;"><li style="flex:1">2.0 </li><li style="flex:1">COMMUNITY PROFILE </li></ul>2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Physical Setting................................................................................................................ 2-1 Existing Land Use............................................................................................................ 2-1 Geology............................................................................................................................ 2-5 Climate........................................................................................................................... 2-13 Drainage Basins and Hydrology.................................................................................... 2-13 Population and Demographic Setting ............................................................................ 2-16 Development Trends...................................................................................................... 2-18 Governmental Structure................................................................................................. 2-21 Review of Existing Plans............................................................................................... 2-26 2.10 Review of Existing Regulations..................................................................................... 2-29 2.11 Critical Facilities, Sheltering Capacity, and Evacuation ............................................... 2-39 <ul style="display: flex;"><li style="flex:1">3.0 </li><li style="flex:1">INLAND FLOODING </li></ul>3.1 3.2 3.3 3.4 3.5 Setting .............................................................................................................................. 3-1 Hazard Assessment.......................................................................................................... 3-1 Historic Record................................................................................................................ 3-5 Existing Programs, Policies, and Mitigation Measures ................................................... 3-7 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 <ul style="display: flex;"><li style="flex:1">JANUARY 2012; ADOPTED MAY 1, 2012 </li><li style="flex:1">TC-i </li></ul>TABLE OF CONTENTS (Continued) <ul style="display: flex;"><li style="flex:1">3.6 </li><li style="flex:1">Potential Mitigation Measures, Strategies, and Alternatives......................................... 3-26 </li></ul>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 <ul style="display: flex;"><li style="flex:1">Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 3-35 </li><li style="flex:1">3.7 </li></ul><ul style="display: flex;"><li style="flex:1">4.0 </li><li style="flex:1">COASTAL FLOODING AND SHORELINE CHANGE </li></ul>4.1 4.2 4.3 4.4 4.5 Setting .............................................................................................................................. 4-1 Hazard Assessment.......................................................................................................... 4-4 Historic Record................................................................................................................ 4-9 Existing Programs, Policies, and Mitigation Measures ................................................. 4-13 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 Potential Mitigation Measures, Strategies, and Alternatives......................................... 4-20 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 4-24 4.6 4.7 <ul style="display: flex;"><li style="flex:1">5.0 </li><li style="flex:1">HURRICANES AND TROPICAL STORMS </li></ul>5.1 5.2 5.3 5.4 5.5 5.6 Setting .............................................................................................................................. 5-1 Hazard Assessment.......................................................................................................... 5-1 Historic Record................................................................................................................ 5-4 Existing Programs, Policies, and Mitigation Measures ................................................... 5-8 Vulnerabilities and Risk Assessment............................................................................. 5-10 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 <ul style="display: flex;"><li style="flex:1">Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 5-19 </li><li style="flex:1">5.7 </li></ul><ul style="display: flex;"><li style="flex:1">6.0 </li><li style="flex:1">SUMMER STORMS AND TORNADOES </li></ul>6.1 6.2 6.3 Setting .............................................................................................................................. 6-1 Hazard Assessment.......................................................................................................... 6-1 Historic Record................................................................................................................ 6-6 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT <ul style="display: flex;"><li style="flex:1">JANUARY 2012; ADOPTED MAY 1, 2012 </li><li style="flex:1">TC-ii </li></ul>TABLE OF CONTENTS (Continued) 6.4 6.5 6.6 6.7 Existing Programs, Policies, and Mitigation Measures ................................................... 6-8 Vulnerabilities and Risk Assessment............................................................................. 6-10 Potential Mitigation Measures, Strategies, and Alternatives......................................... 6-11 Summary of Recommended Mitigation Measures, Strategies, and Alternatives .......... 6-12 7.0 WINTER STORMS AND NOR'EASTERS 7.1 7.2 7.3 7.4 7.5 7.6 Setting .............................................................................................................................. 7-1 Hazard Assessment.......................................................................................................... 7-1 Historic Record................................................................................................................ 7-2 Existing Programs, Policies, and Mitigation Measures ................................................... 7-6 Vulnerabilities and Risk Assessment............................................................................... 7-7 Potential Mitigation Measures, Strategies, and Alternatives........................................... 7-7 7.6.1 Prevention .............................................................................................................. 7-7 7.6.2 Property Protection ................................................................................................ 7-8 7.6.3 Public Education and Awareness........................................................................... 7-8 7.6.4 Emergency Services............................................................................................... 7-8 <ul style="display: flex;"><li style="flex:1">Recommended Actions.................................................................................................... 7-8 </li><li style="flex:1">7.7 </li></ul><ul style="display: flex;"><li style="flex:1">8.0 </li><li style="flex:1">EARTHQUAKES </li></ul>8.1 8.2 8.3 8.4 8.5 8.6 Setting .............................................................................................................................. 8-1 Hazard Assessment.......................................................................................................... 8-1 Historic Record................................................................................................................ 8-3 Existing Programs, Policies, and Mitigation Measures ................................................... 8-4 Vulnerabilities and Risk Assessment............................................................................... 8-4 Potential Mitigation Measures, Strategies, and Alternatives......................................... 8-12 <ul style="display: flex;"><li style="flex:1">9.0 </li><li style="flex:1">WILDFIRES </li></ul>9.1 9.2 9.3 9.4 9.5 9.6 Setting .............................................................................................................................. 9-1 Hazard Assessment.......................................................................................................... 9-1 Historic Record................................................................................................................ 9-1 Existing Programs, Policies, and Mitigation Measures ................................................... 9-3 Vulnerabilities and Risk Assessment............................................................................... 9-3 Potential Mitigation Measures, Strategies, and Alternatives........................................... 9-5 10.0 DAM FAILURE 10.1 Setting ............................................................................................................................ 10-1 10.2 Hazard Assessment........................................................................................................ 10-1 10.3 Historic Record.............................................................................................................. 10-3 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT <ul style="display: flex;"><li style="flex:1">JANUARY 2012; ADOPTED MAY 1, 2012 </li><li style="flex:1">TC-iii </li></ul>TABLE OF CONTENTS (Continued) 10.4 Existing Programs, Policies, and Mitigation Measures ................................................. 10-4 10.5 Vulnerabilities and Risk Assessment............................................................................. 10-5 10.6 Potential Mitigation Measures, Strategies, and Alternatives......................................... 10-6 11.0 RECOMMENDATIONS 11.1 Additional Recommendations........................................................................................ 11-1 11.2 Summary of Specific Recommendations....................................................................... 11-1 11.3 Prioritization of Specific Recommendations ................................................................. 11-8 11.4 Sources of Funding ...................................................................................................... 11-10 12.0 PLAN IMPLEMENTATION 12.1 Implementation Strategy and Schedule ......................................................................... 12-1 12.2 Progress Monitoring and Public Participation............................................................... 12-2 12.3 Updating the Plan........................................................................................................... 12-3 12.4 Technical and Financial Resources................................................................................ 12-4 13.0 REFERENCES .............................................................................................................. 13-1 TABLES Table 1-1 Table 1-2 Table 1-3 Table 2-1 Table 2-2 Table 2-3 Table 2-4 Table 2-5 Table 3-1 Table 3-2 Table 3-3 Table 3-4 Table 3-5 Table 3-6 Table 3-7 Table 3-8 Table 4-1 Table 4-2 Effects of Natural Hazards................................................................................... 1-7 Hazard Event Ranking......................................................................................... 1-8 Hazard Effect Ranking......................................................................................... 1-9 Land Cover by Area (2006)................................................................................. 2-2 Bedrock Geology ................................................................................................. 2-6 Surficial Geology............................................................................................... 2-10 Soil Classifications............................................................................................. 2-11 Critical Facilities................................................................................................ 2-40 FIRM Zone Descriptions ..................................................................................... 3-4 Inland Flooding Repetitive Loss Properties....................................................... 3-22 Critical Facilities Located Within or Adjacent to Floodplains.......................... 3-22 HAZUS-MH Flood Scenario – Basic Information ............................................. 3-23 HAZUS-MH Flood Scenario – Building Stock Damages .................................. 3-24 HAZUS-MH Flooding Scenarios – Debris Generation (Tons) .......................... 3-25 HAZUS-MH Flooding Scenarios – Shelter Requirements................................. 3-25 HAZUS-MH Estimated Direct Losses from Flooding Scenarios (x $1,000) ..... 3-26 Coastal Flooding Repetitive Loss Properties..................................................... 4-18 HAZUS-MH Flood Scenario – Building Stock Damages .................................. 4-19 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT <ul style="display: flex;"><li style="flex:1">JANUARY 2012; ADOPTED MAY 1, 2012 </li><li style="flex:1">TC-iv </li></ul>TABLE OF CONTENTS (Continued) Table 5-1 Table 5-2 Table 5-3 Table 5-4 Table 5-5 Table 5-6 Table 5-7 Table 5-8 Table 5-9 Table 6-1 Table 6-2 Table 6-3 Table 6-4 Table 6-5 Table 7-1 Table 7-2 Table 8-1 Table 8-2 Table 8-3 Tropical Cyclones by Month Within 150 Miles of East Haven, 1851-2011 ....... 5-4 Return Period in Years for Hurricanes to Strike Connecticut............................ 5-11 HAZUS Hurricane Scenarios – Basic Information............................................. 5-12 HAZUS Hurricane Scenarios – Number of Residential Buildings Damaged .... 5-13 HAZUS Hurricane Scenarios – Total Number of Buildings Damaged.............. 5-14 HAZUS-MH Hurricane Scenarios – Essential Facility Damage........................ 5-14 HAZUS-MH Hurricane Scenarios – Debris Generation (Tons)......................... 5-15 HAZUS Hurricane Scenarios – Shelter Requirements....................................... 5-15 HAZUS Hurricane Scenarios – Economic Losses (x $1,000)............................ 5-16 Fujita Scale........................................................................................................... 6-3 Enhanced Fujita Scale.......................................................................................... 6-4 Tornado Events near East Haven......................................................................... 6-6 NOAA Weather Watches..................................................................................... 6-9 NOAA Weather Warnings................................................................................... 6-9 NESIS Categories ................................................................................................ 7-2 Reported Roof Collapse Damage, 2011............................................................... 7-4 Comparison of Earthquake Magnitude and Intensity .......................................... 8-2 Probability of a Damaging Earthquake in the Vicinity of East Haven................ 8-6 HAZUS-MH Earthquake Scenarios – Number of Residential Buildings Damaged .............................................................................................................. 8-7 HAZUS-MH Earthquake Scenarios – Total Number of Buildings Damaged...... 8-7 HAZUS-MH Earthquake Scenarios – Essential Facility Damage........................ 8-8 HAZUS-MH Earthquake Scenarios – Utility, Infrastructure, and Fire Table 8-4 Table 8-5 Table 8-6 Damage ................................................................................................................ 8-9 HAZUS-MH Earthquake Scenarios – Debris Generation (Tons)....................... 8-10 HAZUS-MH Earthquake Scenarios – Shelter Requirements ............................. 8-10 HAZUS-MH Earthquake Scenarios – Casualty Estimates ................................. 8-11 HAZUS-MH Estimated Direct Losses From Earthquake Scenarios (x $1000).. 8-11 Wildland Fire Statistics for Connecticut.............................................................. 9-2 Dams Registered With the DEEP in the Town of East Haven .......................... 10-3 Dams Damaged Due to Flooding From October 2005 Storms.......................... 10-4 Table 8-7 Table 8-8 Table 8-9 Table 8-10 Table 9-1 Table 10-1 Table 10-2 FIGURES Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4 Figure 2-5 Location Map....................................................................................................... 2-2 2006 Land Cover.................................................................................................. 2-4 Bedrock Geology ................................................................................................. 2-7 Surficial Geology................................................................................................. 2-9 Subregional Watersheds..................................................................................... 2-14 HAZARD MITIGATION PLAN UPDATE 2012 EAST HAVEN, CONNECTICUT <ul style="display: flex;"><li style="flex:1">JANUARY 2012; ADOPTED MAY 1, 2012 </li><li style="flex:1">TC-v </li></ul>TABLE OF CONTENTS (Continued) Figure 2-6 Figure 2-7 Figure 2-8 Figure 2-9 Figure 3-1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 4-1 Figure 4-2 Figure 6-1 Population Density............................................................................................. 2-17 Elderly Population ............................................................................................. 2-19 Disabled Population........................................................................................... 2-20 Critical Facilities................................................................................................ 2-41 FEMA Flood Zones with Critical Facilities......................................................... 3-2 FEMA Flood Zones – Upper Farm River.......................................................... 3-14 FEMA Flood Zones – Central Farm River ........................................................ 3-15 FEMA Flood Zones – Lower Farm River.......................................................... 3-16 FEMA Flood Zones – Morris Creek & Tuttle Brook ........................................ 3-20 FEMA Flood Zones along Long Island Sound.................................................... 4-5 Hurricane Surge Inundation Areas and Critical Facilities................................... 4-6 Anatomy of a Tornado......................................................................................... 6-2 Figure 10-1 Dams Registered with the DEEP....................................................................... 10-2

Town of East Haven Hazard Mitigation Plan Update 2012

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