Cover 25% of Residential Parcels and 10% of Commercial Parcels Employ Rooftop Disconnection Disconnection Techniques

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Cover 25% of Residential Parcels and 10% of Commercial Parcels Employ Rooftop Disconnection Disconnection Techniques BRONX RIVER WATERSHED MANAGEMENT PLAN (VOLUME 1) BRONX RIVER WATERSHED ASSESSMENT AND MANAGEMENT REPORT WESTCHESTER COUNTY, NEW YORK Prepared for: Westchester County Department of Planning 148 Martine Avenue, Room 432 White Plains, New York 10601-4704 Prepared by: Center for Watershed Protection, Inc. 8390 Main Street, 2nd Floor Ellicott City, MD 21043 Biohabitats, Inc. 2081 Clipper Park Road Baltimore, MD 21211 October 2007 WESTCHESTER COUNTY DEPARTMENT OF PLANNING Gerard E. Mulligan, AICP, Commissioner Bronx River Watershed Assessment and Management Report Prepared for: Westchester County Department of Planning 148 Martine Avenue, Room 432 White Plains, NY 10601-4704 Prepared by: Center for Watershed Protection, Inc. Biohabitats, Inc. 8390 Main Street, 2nd Floor 2081 Clipper Park Road Ellicott City, MD 21043 Baltimore, MD 21211 October 2007 Funding support from the New York State Department of State Division of Coastal Resources, provided under Title 11 of the Environmental Protection Fund, Local Waterfront Revitalization, assisted the preparation of this plan. Bronx River Watershed Assessment and Management Report Table of Contents Executive Summary...................................................................................................................E-1 E.1 Introduction..........................................................................................................E-1 E.2 Management and Restoration Framework for the Bronx River Watershed ........E-1 E.3 Management and Restoration Opportunities in the Bronx River Watershed ......E-2 E.4 Report Organization.............................................................................................E-5 Section 1. Introduction........................................................................................................ 1-1 1.1 Process for Developing the Watershed Assessment and Management Report................................................................................................................... 1-1 1.2 Caveats................................................................................................................. 1-3 Section 2. Baseline Conditions in the Bronx River Watershed ....................................... 2-1 2.1 Introduction to the Baseline Assessment ............................................................. 2-1 2.2 Natural Features................................................................................................... 2-1 2.3 Community Features.......................................................................................... 2-12 2.4 Land Use and Land Cover ................................................................................. 2-17 2.5 Subwatershed Prioritization............................................................................... 2-21 Section 3. Stream Corridor and Upland Assessments Protocols and General Findings............................................................................................................... 3-1 3.1 Introduction to the Stream Corridor and Upland Assessments............................ 3-1 3.2 Unified Stream Assessment and Riparian Corridor Restoration Inventory......... 3-6 3.3 Unified Subwatershed and Site Reconnaissance ............................................... 3-14 3.4 Stormwater Retrofit Inventory........................................................................... 3-28 Section 4. Watershed Goals and Recommendations ........................................................ 4-1 4.1 Bronx River Watershed Goal and Objectives...................................................... 4-1 4.2 Implementation Recommendations ..................................................................... 4-2 Section 5. Management and Restoration Practices Applicable to the Bronx River Watershed........................................................................................................... 5-1 5.1 Upland Stormwater Retrofits ............................................................................... 5-2 5.2 Riparian Corridor Restoration.............................................................................. 5-6 5.3 Pervious Area Management and Restoration....................................................... 5-7 5.4 Pollution Prevention and Source Control Education ........................................... 5-9 5.5 Municipal Practices and Programs..................................................................... 5-13 Section 6. Subwatershed Management Strategies............................................................ 6-1 6.1 Bronx River Middle Direct Drainage (BRM)...................................................... 6-4 6.2 Fulton Brook (FB).............................................................................................. 6-15 6.3 Grassy Sprain Brook (GSB)............................................................................... 6-22 6.4 Hartsdale Brook (HB)........................................................................................ 6-29 6.5 Manhattan Park Brook (MP).............................................................................. 6-34 Section 7. Other Subwatersheds......................................................................................... 7-1 7.1 Bronx River Lower Direct Drainage (BRL) ........................................................ 7-2 7.2 Bronx River Upper Direct Drainage (BRU) ........................................................ 7-5 7.3 Clove Brook (CB)................................................................................................ 7-9 Page i Bronx River Watershed Assessment and Management Report 7.4 Davis Brook (DB).............................................................................................. 7-11 7.5 Fox Meadow Brook (FMB) ............................................................................... 7-15 7.6 Grassy Sprain Brook Direct Drainage (GSD).................................................... 7-16 7.7 Kensico Reservoir (KR)..................................................................................... 7-18 7.8 Sprain Brook (SB).............................................................................................. 7-19 7.9 Troublesome Brook (TB)................................................................................... 7-23 7.10 White Plains Reservoirs (WPR)......................................................................... 7-24 References.................................................................................................................................. R-1 Appendix A. Bronx River References and Mapping Resources Appendix B. Bronx River Watershed Level II Land Use and Environmental Function Appendix C. Bronx River Watershed Impervious Surface Methodology Appendix D. Description of the Watershed Treatment Model Appendix E. Bronx River Watershed Comparative Subwatershed Analysis Metrics Appendix F. Review of Management and Restoration Practice Evaluation and Ranking Methodology Appendix G. Restoration and Management Practices Recommended for the Bronx River Watershed Appendix H. Bronx River Subwatershed Maps Appendix I. Priority Uplands Stormwater Retrofit Project Concepts Appendix J. Priority Riparian Corridor Restoration Project Concepts Page ii Bronx River Watershed Assessment and Management Report List of Tables Table E-1: High Priority Upland Stormwater Retrofit Opportunities in the Bronx River Watershed...................................................................................................E-3 Table E-2: High Priority Riparian Corridor Restoration Opportunities in the Bronx River Watershed...................................................................................................E-3 Table E-3: High Priority Pervious Area Management and Restoration Opportunities in the Bronx River Watershed..............................................................................E-4 Table E-4: High Priority Neighborhood Source Control Opportunities in the Bronx River Watershed...................................................................................................E-4 Table E-5: High Priority Privately Owned Hotspot Management Opportunities in the Bronx River Watershed........................................................................................E-4 Table E-6: High Priority Publicly Owned Hotspot Management Opportunities in the Bronx River Watershed........................................................................................E-5 Table 2-1: Basic Profile of the Bronx River Watershed........................................................ 2-3 Table 2-2: Bronx River Subwatersheds in Westchester County ........................................... 2-5 Table 2-3: Wetlands and Hydric Soils Coverage in the Bronx River Subwatersheds .......... 2-7 Table 2-4: Jurisdictions in the Bronx River Watershed ...................................................... 2-13 Table 2-5: Bronx River Subwatersheds and Jurisdictions................................................... 2-14 Table 2-6: Categorization of Land Use Codes (Source:WCDP, 2005c)............................. 2-18 Table 2-7: Bronx River Watershed Current Level I Land Use and Water Coverage.......... 2-18 Table 2-8: Bronx River Subwatersheds Impervious Cover................................................. 2-19 Table 2-9: Undeveloped Land Use by Subwatershed ......................................................... 2-21 Table 2-10: Secondary Sources and Assumptions ...............................................................
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