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Flood Insurance Study, City of New York, Bronx, Queens, New York, Kings, and Richmond Counties, New York, Washington, D.C

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Flood Insurance Study, City of New York, Bronx, Queens, New York, Kings, and Richmond Counties, New York, Washington, D.C VOLUME 1 OF 1 CITY OF NEW YORK, NEW YORK COMMUNITY NAME COMMUNITY NUMBER BRONX COUNTY KINGS COUNTY NEW YORK COUNTY QUEENS COUNTY City of New York RICHMOND COUNTY Preliminary: DECEMEBER 5, 2013 FLOOD INSURANCE STUDY NUMBER 360497V000B Version Number 1.0.0.0 NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial FIS Effective Date: May 16, 1983 (FIS report); November 16, 1983 (Flood Insurance Rate Map) Revised FIS Dates: February 15, 1991- To change zone designations and to add special flood hazard areas. May 18, 1992- To add otherwise protected areas. July 5, 1994- To add base flood elevations, to add special flood hazard areas and to change special flood hazard areas. May 21, 2001- To reflect updated topographic information, to update map format and to change special flood hazard areas. September 5, 2007- To reflect updated topographic information, to update map format and to change special flood hazard areas TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 1 1.3 Coordination 2 2.0 AREA STUDIED 3 2.1 Scope of Study 3 2.2 Community Description 5 2.3 Principal Flood Problems 8 2.4 Flood Protection Measures 11 3.0 ENGINEERING METHODS 13 3.1 Riverine Hydrologic Analyses 13 3.2 Riverine Hydraulic Analyses 18 3.3 Coastal Analyses 20 3.4 Wave Height Analyses 22 3.5 Vertical Datum 57 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 57 4.1 Floodplain Boundaries 58 4.2 Floodways 58 5.0 INSURANCE APPLICATIONS 71 6.0 FLOOD INSURANCE RATE MAP 72 7.0 OTHER STUDIES 72 8.0 LOCATION OF DATA 73 9.0 BIBLIOGRAPHY AND REFERENCES 73 TABLE OF CONTENTS - continued Page FIGURES Figure 1-1: Bronx published and mapping transect location map ................................................ 24 Figure 1-2: New York County published and mapping transect map .......................................... 25 Figure 1-3: Richmond County published and mapping transect map ........................................... 26 Figure 1-4: Kings County published and mapping transect map .................................................. 27 Figure 1-5: Queens County published and mapping transect map ............................................... 28 Figure 2: Transect Schematic ........................................................................................................ 31 Figure 3: Floodway Schematic ..................................................................................................... 70 TABLES Table 1 – Detailed Flooding Sources .............................................................................................. 4 Table 2 – Population And Land Area Of New York City .............................................................. 6 Table 3 – Summary Of Discharges ................................................................................................ 14 Table 4 – Summary Of Stillwater Elevations ............................................................................... 17 Table 5 – Transect Data ................................................................................................................ 32 Table 6 – Floodway Data ...............................................................................................................60 EXHIBITS Exhibit 1 - Flood Profiles Arbutus Creek Panels 01P-02P Blue Heron Main Branch Panels 03P-04P Blue Heron Tributary Panel 05P Bronx River Panels 06P-09P Butler Manor Panel 10P Colon Tributary Panels 11P-12P D Street Brook Panels 13P-14P Denise Tributary Panel 15P Eltingville Tributary Panel 16P Forest Hill Road Brook Panels 17P-19P Jansen Tributary Panel 20P Lemon Creek Panels 21P-24P Mill Creek Panels 25P-26P Mill Creek Tributary 1 Panel 27P Mill Creek Tributary 2 Panel 28P Mill Creek Tributary 3 Panel 29P Richmond Creek Panels 30P-38P Sandy Brook Panels 39P-41P ii EXHIBITS – continued Exhibit 1 - Flood Profiles (continued) Sweet Brook Panels 42P-45P Wolfe’s Pond Panel 46P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map iii FLOOD INSURANCE STUDY CITY OF NEW YORK, BRONX, KINGS, NEW YORK, QUEENS, AND RICHMOND COUNTIES, NEW YORK 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and updates a previous FIS/Flood Insurance Rate Map (FIRM) for the City of New York, which incorporates all of Bronx, Kings, New York, Queens, and Richmond counties, New York, this also includes Ellis Island and Liberty Island. This information will be used by the City of New York to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional planners to further promote sound land use and floodplain development. In some States or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this FIS are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. For the original May 16, 1983, FIS and November 16, 1983, FIRM (hereinafter referred to as the 1983 FIS), the hydrologic and hydraulic analyses for Arthur Kill, the Atlantic Ocean, Bronx Kill, the Bronx River, the East River, the Harlem River, the Hudson River, the Hutchinson River, Jamaica Bay, Kill Van Kull, Long Island Sound, Lower Bay, Newark Bay, Raritan Bay, and Upper Bay were prepared by Camp, Dresser and McKee, Inc., under subcontract to the New York State Department of Environmental Conservation (NYSDEC) for the Federal Emergency Management Agency (FEMA), under Contract No. H-4784. That work was completed in December 1981. For the February 15, 1991, revision, the hydrologic and hydraulic analyses for Ranger Creek were prepared by the New York City Department of City Planning for FEMA. That work was completed in May 1989. For the July 5, 1994, revision, the hydrologic and hydraulic analyses for Sweet Brook, Colon Tributary, Eltingville Tributary, Arbutus Creek, Jansen Tributary, Denise Tributary, Lemon Creek, and Sandy Brook, were prepared by Leonard Jackson Associates for FEMA, under Contract No. 91-R-3373. That work was completed in June 1992. 1 For the May 21, 2001, revision, updated topographic information of wetlands within Richmond County only was prepared by the New York City Department of Environmental Protection (NYCDEP). This information was agreed upon with FEMA to be used for the revision. For the September 5, 2007, revision, updated topographic information for the City of New York was provided by the City of New York Department of Information Technology and Telecommunication (DOITT) and used to redelineate all detailed flood hazard areas. Additionally, updated hydrologic and hydraulic analyses for the Bronx River, Arbutus Creek, Blue Heron Main, Blue Heron Tributary, Butler Manor, Colon Tributary, D Street Brook, Denise Tributary, Eltingville Tributary, Foresthill Road Brook, Jansen Tributary, Lemon Creek, Mill Creek, Mill Creek Tributary 1, Mill Creek Tributary 2, Mill Creek Tributary 3, Sandy Brook, Sweet Brook, and Richmond Creek were prepared by Leonard Jackson Associates for FEMA, under Contract No. EMN-2003-RP-001. For the [date] revision, updated topographic information generated by LiDAR (Light Detection and Ranging) for the City of New York was collected and processed by Sanborn Map Company. The LiDAR data were collected from April 14 to May 1, 2010. The updated topographic information was used to redelineate all detailed flood hazard areas. New coastal analysis was performed for the coastal flood hazard areas. Base map information shown on the FIRMs was provided by DOITT. This information was derived from digital orthophotography produced at a scale of 1:1,200 from photography dated April 2008. The coordinate system used for the production of this FIRM is New York State Plane FIPSZONE 3104. 1.3 Coordination The purpose of an initial Consultation Coordination Officer's (CCO) meeting is to discuss the scope of the FIS. A final CCO meeting is held to review the results of the study. For the 1983 FIS, an initial CCO meeting was held on August 12, 1976, and a final CCO meeting was held on December 13, 1982. Both of these meetings were attended by representatives of the City of New York; Camp, Dresser and McKee, Inc.; and FEMA. For the July 5, 1994, study, an initial CCO meeting was held on February 1990 and was attended by representatives of the City of New York, Leonard Jackson Associates, and FEMA. For the May 21, 2001, revision, a Cooperating Technical Community (CTC) Agreement was made on July 8, 1999, between the Borough of Staten Island and FEMA. 2 For the September 5, 2007, revision, an initial
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