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New Hope Creek and Little Creek Watershed Improvement Plan

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New Hope Creek and Little Creek Watershed Improvement Plan DRAFT-Volume I New Hope Creek and Little Creek Executive Summary Watershed Improvement Plan Durham, North Carolina June 2021 PREPARED FOR: City of Durham Public Works Department Stormwater & GIS Services Division 101 City Hall Plaza, Third Floor Durham, North Carolina 27701 This page intentionally left blank. New Hope Creek and Little Creek Watershed Improvement Plan City of Durham Stormwater & GIS Services Division Public Works Department 101 City Hall Plaza, Third Floor Durham, North Carolina 27701 This page intentionally left blank. Acknowledgments The AECOM Team received assistance from many individuals while completing the Watershed Improvement Plan for the New Hope Creek and Little Creek Watershed Improvement Plan, including the following: City of Durham Team Paul Wiebke, Assistant Director, Public Works Sara Schwarzer Lance Fontaine, Project Manager J.V. Loperfido Sandra Wilbur, Engineering Manager Jonathan Baker Megan Walsh Michelle Woolfolk Laura Smith Joseph Smith Jeff Lecky Travis Marion Erin Harrison Cory Caddell Antwon Williams Sean McKnight AECOM Team AECOM Technical Services of North Carolina Brian Jacobson, Project Manager Brad Courtney Sujit Ekka, Deputy Project Manager Beth Kerby Hayden Strickling Laurie Huber Jonathan Lewis Wildlands Engineering Three Oaks Engineering Jeff Keaton Suzanne Young Carolyn Lanza Tom Dickinson Abigail Vieira Diana Young-Paiva Meghan Makoid Kimley-Horn Kate Monteith Sevick Beth Reed Lizzy Stokes-Cawley Jennifer Murphy Lillian Lovingood Andrew Jones Jared Hodes Davenport Brian Spiro Matt Michel Ryanne Murphy LimnoTech Scott Bell Julie Padilla Peter Klaver This page intentionally left blank. Table of Contents Acronyms and Abbreviations ........................................................................................................................................ iii 1 Introduction ......................................................................................................................................................... 1-1 1.1 Background ................................................................................................................................................................................... 1-1 1.2 Goals ................................................................................................................................................................................................ 1-2 1.3 Organization ................................................................................................................................................................................. 1-3 2 Watershed Concerns ........................................................................................................................................... 2-1 3 Watershed Improvement Scenarios ................................................................................................................. 3-1 3.1 Stormwater Management Modeling................................................................................................................................... 3-2 3.2 Scenario Results .......................................................................................................................................................................... 3-2 4 Watershed Improvement Project Prioritization ............................................................................................. 4-1 5 Public Outreach and Involvement .................................................................................................................... 5-1 5.1 Equitable Community Engagement Plan........................................................................................................................... 5-1 5.2 Public Information and Outreach Sessions ...................................................................................................................... 5-1 5.3 New Hope Creek and Little Creek Watershed Improvement Plan Webpage ..................................................... 5-1 5.4 Project StoryMap ........................................................................................................................................................................ 5-2 5.5 Social Media Updates ............................................................................................................................................................... 5-2 5.6 Project Fact Sheets ..................................................................................................................................................................... 5-2 5.7 Educational Radio Spots .......................................................................................................................................................... 5-2 5.8 Educational Videos ..................................................................................................................................................................... 5-2 6 Watershed Improvement Plan .......................................................................................................................... 6-1 6.1 Stormwater Runoff Treatment from Older Urban Areas ............................................................................................. 6-1 6.2 High-Priority Stream Improvement Projects.................................................................................................................... 6-1 6.3 High-Priority SCM Projects ..................................................................................................................................................... 6-1 6.4 Green Stormwater Infrastructure and Low Impact Development Opportunities .............................................. 6-2 6.5 Street Sweeping .......................................................................................................................................................................... 6-2 6.6 Protection and Preservation of High-Quality Riparian Areas .................................................................................... 6-2 6.7 Continuation of Existing City Programs and Practices ................................................................................................. 6-3 6.8 Evaluating Progress .................................................................................................................................................................... 6-4 7 References ............................................................................................................................................................ 7-1 Appendix Appendix A: Fact Sheets for Recommended High-Priority Projects New Hope Creek and Little Creek Watershed Improvement Plan, Volume I – DRAFT i Tables Table 1-1. USEPA’s nine key elements for watershed plans and corresponding section in the WIP ......................... 1-4 Table 2-1. Summary of New Hope Creek and Little Creek watershed pollution sources ............................................... 2-1 Table 3-1. Estimated change in TN, TP, and sediment annual loads and reductions for watershed improvement scenarios evaluated in the New Hope Creek and Little Creek Watershed study area .................................................................................................................................................................................. 3-4 Table 3-2. Estimated TN, TP, and sediment annual load reductions for each practice evaluated in the New Hope Creek and Little Creek watershed study area....................................................................................... 3-5 Table 4-1. Prioritization criteria with scoring ranges and weighting factors ....................................................................... 4-2 Table 4-2. High-priority SCM projects in the New Hope Creek and Little Creek watersheds ...................................... 4-3 Table 4-3. High priority stream improvement projects in the New Hope Creek and Little Creek watersheds ................................................................................................................................................................................ 4-4 Table 4-4. High priority stream improvement projects located on parcels owned by Duke University in the New Hope Creek and Little Creek watersheds .............................................................................................. 4-5 Table 6-1. Information used to track the effectiveness of controls in the New Hope Creek and Little Creek watershed ..................................................................................................................................................................... 6-5 ii New Hope Creek and Little Creek Watershed Improvement Plan, Volume I – DRAFT Acronyms and Abbreviations µg .................... Micrograms NPDES ........... National Pollutant Discharge CAPP............... Critical Area Protection Plan Elimination System CCC ................. Criterion Continuous Concentration NSW ............... Nutrient Sensitive Water cfu ................... Colony Forming Unit PCSWMM ..... Personal Computer Storm Water Management Model City .................. City of Durham RAMP ............. Riparian Area Management Plan ELU .................. Existing Land Use ReGIn ............. Residential Green Infrastructure ft3/s ................ Cubic Feet Per Second RSAT ............... Rapid Stream Assessment Technique FLU .................. Future Land
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