Hazard Mitigation Plan Update SEYMOUR, CT

Naugatuck Valley Council of Governments Hazard Mitigation Plan Update 2021 – 2026 Municipal Annex for SEYMOUR, CT 1 First Street Seymour, CT 06483 MMI #3211-29 Prepared for: Prepared by: NAUGATUCK VALLEY COUNCIL OF GOVERNMENTS SLR CONSULTING 47 Leavenworth Street, 3rd Floor 99 Realty Drive Waterbury, CT 06702 Cheshire, Connecticut 06410 (203) 489-0362 (203) 271-1773 www.nvcogct.org www.slrconsulting.com TABLE OF CONTENTS 1.0 INTRODUCTION ......................................................................................................................................... 1-1 1.1 PURPOSE OF ANNEX .................................................................................................................................... 1-1 1.2 PLANNING PROCESS .................................................................................................................................... 1-1 1.3 PHYSICAL SETTING ...................................................................................................................................... 1-1 1.4 LAND COVER ............................................................................................................................................. 1-2 1.5 GEOLOGY .................................................................................................................................................. 1-2 1.6 CLIMATE AND CLIMATE CHANGE .................................................................................................................... 1-3 1.7 DEVELOPMENT TRENDS ................................................................................................................................ 1-5 1.8 HISTORIC AND CULTURAL RESOURCES .............................................................................................................. 1-6 1.9 SOCIAL VULNERABILITY INDEX ........................................................................................................................ 1-6 2.0 MUNICIPAL CAPABILITIES .......................................................................................................................... 2-7 2.1 GOVERNMENTAL STRUCTURE AND CAPABILITIES................................................................................................. 2-7 2.2 INFRASTRUCTURE ...................................................................................................................................... 2-12 2.3 CRITICAL FACILITIES AND EMERGENCY RESPONSE.............................................................................................. 2-12 3.0 FLOODING ............................................................................................................................................... 3-15 3.1 EXISTING CAPABILITIES ............................................................................................................................... 3-15 3.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 3-16 4.0 HURRICANES AND TROPICAL STORMS .................................................................................................... 4-20 4.1 EXISTING CAPABILITIES ............................................................................................................................... 4-20 4.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 4-21 5.0 SUMMER STORMS AND TORNADOES ..................................................................................................... 5-22 5.1 EXISTING CAPABILITIES ............................................................................................................................... 5-22 5.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 5-22 6.0 WINTER STORMS ..................................................................................................................................... 6-24 6.1 EXISTING CAPABILITIES ............................................................................................................................... 6-24 6.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 6-24 7.0 GEOLOGICAL HAZARDS ........................................................................................................................... 7-25 7.1 EXISTING CAPABILITIES ............................................................................................................................... 7-25 7.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 7-25 8.0 DAM FAILURE .......................................................................................................................................... 8-27 8.1 EXISTING CAPABILITIES ............................................................................................................................... 8-27 8.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 8-27 9.0 WILDFIRES ............................................................................................................................................... 9-32 9.1 EXISTING CAPABILITIES ............................................................................................................................... 9-32 9.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 9-32 10.0 MITIGATION STRATEGIES AND ACTIONS ............................................................................................... 10-34 10.1 GOALS AND OBJECTIVES ........................................................................................................................... 10-34 10.2 STATUS OF MITIGATION STRATEGIES AND ACTIONS FROM PREVIOUS HMP .......................................................... 10-34 10.3 PRIORITIZATION OF STRATEGIES AND ACTIONS ............................................................................................... 10-39 10.4 MITIGATION STRATEGIES AND ACTIONS IMPLEMENTATION TABLE ...................................................................... 10-40 Municipal Annexes: Seymour 1.0 INTRODUCTION 1.1 Purpose of Annex This Hazard Mitigation Plan (HMP) annex provides a community-specific hazard risk assessment, capability analysis, and evaluation and prioritization of hazard mitigation measures and projects. Background information and the regional effects of pertinent natural hazards are discussed in the main body of the Naugatuck Valley Council of Governments (NVCOG) Multi-Jurisdictional Hazard Mitigation Plan. This annex is designed to supplement the information presented in the Multi-Jurisdictional HMP with more specific local detail, and is not to be considered a standalone document. The primary goal of this HMP, including this Municipal Annex, is to identify natural hazard risks and mitigation opportunities in order to reduce the loss of or damage to life, property, infrastructure, and natural, cultural, and economic resources. This includes the reduction of public and private damage costs. Limiting losses of and damage to life and property will also reduce the social, emotional, and economic disruption associated with a natural disaster. 1.2 Planning Process A meeting was held with Seymour representatives on Provided comments and feedback via email for the purposes of initial data collection and review of necessary updates for this document. The meeting was convened by the HMP local coordinator, Thomas Eighmie. Additional input was provided at the two regional municipal staff workshops, held on November 18, 2020, and February 3, 2021. Public input collected at public workshops and through an online survey have also informed development of this HMP update. 1.3 Physical Setting Seymour lies within the region of Connecticut called the "Naugatuck River Valley," which extends from Torrington to Derby and includes the city of Waterbury. The Route 8 corridor and the Waterbury branch of the Metro-North railroad line span this region. The "Lower Naugatuck Valley" is sometimes known to include the towns of Oxford, Bethany, Beacon Falls, and Woodbridge in addition to Ansonia, Derby, and Seymour. In general, the topography of the region increases in elevation moving from the shorelines of the major rivers (the Housatonic and Naugatuck Rivers, which are nearly at sea level) to the east and/or west of either river. Within the region, elevations of 500 feet or greater are found along western and southwestern Seymour and western Shelton while there are a few other smaller, more concentrated areas of this elevation in northern and eastern Seymour and northeastern Ansonia. NVCOG Hazard Mitigation Plan Update 1-1 August 2021 Municipal Annexes: Seymour Seymour has a peak of approximately 640 feet in the southwestern part of the town on Great Hill along Route 334/Great Hill Road. The areas with greatest relief are found in southwestern Seymour (at Great Hill) where elevations of 630 feet to 640 feet can be found. 1.4 Land Cover A high-density industrial center was developed in the 19th and 20th centuries in downtown Seymour. A decrease in developed land cover

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