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Comprehensive Storm Drainage Improvement Study for the Village of Amityville Town of Babylon, Suffolk County, New York

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Comprehensive Storm Drainage Improvement Study for the Village of Amityville Town of Babylon, Suffolk County, New York Comprehensive Storm Drainage Improvement Study For the Village of Amityville Town of Babylon, Suffolk County, New York Prepared for; Prepared By Village of Amityville Nelson & Pope Department of Public Works 572 Walt Whitman Road 21 Ireland Place Melville, NY 11747-2188 Amityville, NY 11701 June 2018 COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 TABLE OF CONTENTS EXECUTIVE SUMMARY 1 1.0 INTRODUCTION 4 1.1 Background 4 1.2 Study Purpose 6 1.3 Study Area 7 1.4 Land Use and Population 9 2.0 FLOOD HISTORY, FEMA MAPS AND FLOOD RISK 12 2.1 Flood History 12 2.2 FEMA Flood Maps 16 3.0 GOALS, OBJECTIVES AND OPPORTUNITIES 18 3.1 Study Goal 18 3.2 Study Objectives 18 3.3 Study Opportunities 19 4.0 STUDY IMPLEMENTATION 20 4.1 Data Collection and Preparation of Plans 20 4.2 Field Visits and Observed Flooding 21 4.3 Existing Conditions 22 4.4 Analysis of the Existing Drainage Systems 25 5.0 MODELING AND HYDRAULIC ANALYSIS 28 6.0 POTENTIAL ALTERNATIVES 30 6.1 Potential Environmental Permits Required for Alternatives 30 6.2 Description of Various Strategies and Improvements 36 6.3 Proposed Improvements 38 7.0 IDENTIFIED PROBLEM AREAS, ASSOCIATED CONSTRUCTION 44 COSTS AND BENEFITS 7.1 Identified Problem Areas 44 Table of Contents COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 7.2 Associated Costs 48 7.3 Benefits 55 8.0 PROPOSED PROJECTS 57 8.1 Proposed Projects 57 8.2 Funding Sources 58 9.0 RECOMMENDED PROJECTS 61 FIGURES Figure 1 Map of Study Area 8 Figure 2 Land Use Map 10 Figure 3 Population Map 11 Figure 4 Sea, Lake and Overland Surges from Hurricanes (SLOSH) Map 15 Figure 5 NYSDEC Freshwater & Tidal Wetlands 35 APPENDICES Appendix 1 Master Drainage Plan Appendix 2 Elevation Map Appendix 3 Flood Insurance Rate Map and Hurricane Surge Zone Map Appendix 4 Tidal and Freshwater Wetlands Map Appendix 5 Improvement Details Appendix 6 Photo Log Appendix 7 Cost Basis for Alternatives Appendix 8 Resident Complaints Received by Village Appendix 9 Concept Plans Table of Contents COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 EXECUTIVE SUMMARY The Comprehensive Storm Drainage Improvement Study for the Village of Amityville has been prepared by Nelson & Pope, Melville, New York at the request of the Village of Amityville under the guidance of New York State Governor’s Office of Storm Recovery (GOSR). The project has been funded and conceived through the New York Rising Community Reconstruction Program of the Governor’s Office of Storm Recovery. In 2012, Long Island’s south shore was besieged with stormwater due to Superstorm Sandy, like the 2011 storm, Hurricane Irene. Floodwaters inundated roadways, homes, schools, Municipal buildings, and businesses and made streets impassable and areas unusable. The storm surge from Superstorm Sandy pushed seawater into the Narraskatuck Creek, Amityville Creek and Woods Creek, overflowing the shoreline banks, canals, and bulkheads into the low-lying areas of land within the community. The devastation was substantial with more than 900 homes experiencing major damage, 23% of the entire housing units in the Village. The elevation of the study area south of Merrick Road varies between 2 to 10-feet above sea level. The areas along the Great South Bay shoreline and areas adjacent to the creeks and canals experienced damaging water from the peak storm surges during high tide that rose over the bulkheads and filled the drainage systems, backing up into adjacent neighborhoods. Many homes suffered significant damage from Superstorm Sandy’s storm surge and some remain vacant to this day. The Village of Amityville has been experiencing more frequent flooding events due to moon tides and/or high tides that have directly affected the quality of life throughout the community. The Rising Community Reconstruction (NYRCR) Program established by the State of New York empowers the “most impacted communities with the technical expertise needed to develop thorough and implementable reconstruction plans to build physically, socially, and economically resilient and sustainable communities.” In 2014, a group of community residents and leaders from the Village of Amityville and the Hamlet of Copiague formed the Village of Amityville / Copiague NY Rising Community Executive Summary 1 COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 Reconstruction Planning Committee, which created a plan to rebuild the damage caused by Superstorm Sandy and to prepare for any future storms. In March 2014, NYRCR Program issued its report for the Village of Amityville / Copiague Community. The report contains sections that describe the community overview; provide an assessment of risks and needs; describe the reconstruction and resiliency strategies; and develop the proposed projects for implementation for Village of Amityville and the Hamlet of Copiague in the Town of Babylon. The NYRCR Plan enabled Village of Amityville to be eligible for US Housing and Urban Development (HUD) Community Development Block Grant-Disaster Recovery (CDBG- DR) funding for long-term recovery and resiliency projects, with funding delivered through the NYRCR Program. The Village sought out qualified engineering firms through their Request for Proposal (RFP) process. In accordance with New York State General Municipal Law Section 104-b, the Request for Proposals (RFP) was designed to identify New York State licensed professional architectural and engineering (A/E) firms best qualified to provide the services necessary to prepare a comprehensive storm drainage improvement study followed by design, bidding and construction administration and inspection services for the NY Rising Community Reconstruction area of the Village of Amityville. The Village has retained Nelson & Pope, in coordination with sub-consultants Gayron de Bruin Land Surveying and Engineering, PC and CSM Engineering, to perform a comprehensive engineering inventory of stormwater collection, conveyance, and discharge components and to assess the Village of Amityville’s drainage systems, building upon the NYRCR Plans and Pre-application Reports. The engineering analysis will also evaluate the drainage system’s ability to accommodate storm flow and recommend improvements and solutions to satisfy these flooding conditions. The project will produce a strategy for drainage infrastructure upgrades pertaining to flood mitigation and when implemented, provide a more flood resilient community and will progress plans to the Final Design stage for those projects approved by the Village and through the construction of the approved projects. The Drainage Report discusses the conditions of the existing drainage systems, the drainage outlets and bulkheads within the project area. Hydrological analyses of these drainage systems, how they were modeled, the assumptions and criteria used, and the Executive Summary 2 COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 deficiencies identified are also included in this Report as well as a description of the various strategies and improvements to be considered; a comparison of these alternatives which shows the assessment of benefits, permits required, adverse impacts and the estimated construction cost of each alternative. The Report provides a list of proposed projects to address identified deficiencies within the Village of Amityville. The Village will review the list of proposed projects from the report and then, in cooperation with the NYRCR Amityville Planning Committee and the Village of Amityville officials, will choose which projects will be progressed to Construction Contract Documents used I the Bid Process to obtain a qualified Contractor who will then construct the projects based on the allotted CDBG-DR funding. Executive Summary 3 COMPREHENSIVE STORM DRAINAGE IMPROVEMENT STUDY THE VILLAGE OF AMITYVILLE June 2018 1.0 INTRODUCTION 1.1 BACKGROUND The Village of Amityville is in the southwest section of the Town of Babylon in Suffolk County, on Long Island, New York. The Village of Amityville is a suburban community dotted with residential neighborhoods. North of Merrick Road, the Village contains a variety of commercial uses and residential neighborhoods while the area south of Merrick Road is primarily residential with marine related businesses located on peninsulas separated by canals and creeks and the South Oyster Bay to the south. The Village residents value their connection to the water evident by the numerous homes located with their backyards on the canals, creeks, and the Bay. The Village of Amityville is comprised of 3.5 square miles with a population of 9,523 residents, based on the 2010 census. There are three bodies of water that flow into South Oyster Bay; Narraskatuck Creek, Amityville Creek and Woods Creek. Residential homes are located along these creeks and along the numerous canals. There is one park in the Village, James Caples Memorial Park, located on the Bay that includes a small Village beach. Merrick Road is dotted with commercial businesses and the Business District or Downtown Amityville is located along Broadway (Route 110) and is the main commercial and civic areas within the community Starting in August 2011, Long Island experienced several extreme weather events. Including Hurricane Irene, Tropical Storm Lee and Superstorm Sandy, that wreaked havoc on Long Islanders and their communities. These events signaled that Long Islanders must now deal with the reality defined by rising
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