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Lake Raleigh Wetland Creation Feasibility Study

Lake Raleigh Wetland Creation Feasibility Study. NC State Centennial Campus Melanie Carter, Jennifer Burdette, Amanda Jones. Project Description. Purpose Determine if a wetland could be created in a designated open space on Centennial Campus Proposed Project

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Lake Raleigh Wetland Creation Feasibility Study

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  1. Lake Raleigh Wetland CreationFeasibility Study NC State Centennial Campus Melanie Carter, Jennifer Burdette, Amanda Jones

  2. Project Description • Purpose • Determine if a wetland could be • created in a designated open space • on Centennial Campus • Proposed Project • Riverine Wetland Creation • --Groundwater, stormwater, and • overbank flow inputs • -- Native wetland vegetation • -- Wildlife Habitat • Pedestrian Greenway and Access • History • Stormwater pond and proposed • wetland location “built” in early 1990’s

  3. Feasibility Study Components • Existing Conditions • Site Description and Land Use • Physical & Natural Resources • Soils • Hydrology • Vegetation • Geology • Flood Hazard • Cultural Resources

  4. Feasibility Study Components (cont’d) • Chain-of-Title • Environmental Hazard Assessment • Jurisdictional Issues • Waters of the US (Section 404) • Protected Species • Riparian Buffers • Constraints

  5. Existing Site Conditions Site Description & Land Use • Study Site (~2 acres) • Semi-natural landscape with • planned pedestrian trail • West Boundary • Perennial Stream and Forebay • East Boundary • Herbaceous Upland Slope

  6. Existing Site Conditions – Soils

  7. Existing Site Conditions – Soils

  8. Existing Conditions -- Hydrology DETAIL

  9. Existing Site Conditions

  10. Jurisdictional Issues • Area of construction located above ordinary high water mark of perennial stream and does not contain jurisdictional wetlands • No Section 404/401 permit from US Army Corps of Engineers or NC Division of Water Quality required • Area for proposed wetland creation located within Neuse River Basin Riparian Buffer • No Neuse River Riparian Buffer Compliance required from NC Division of Water Quality

  11. ConceptualWetland Design DETAIL Proposed Levee • Create level area east of • stream channel • Divert ephemeral • drainage through • constructed wetland • Build a low levee along • perennial channel to • detain portion of • ephemeral drainage Area to be Leveled Ephemeral Drainage

  12. Conceptual Wetland DesignCross-section Pedestrian Trail Existing Grade Proposed Grade Seasonal High Water Table Perennial Stream

  13. Suggested Wetland Plants Lizard’s Tail Buttonbush Spicebush Jack-in-the-Pulpit Swamp Rose Photos courtesy of USDA PLANTS Database http://plants.usda.gov/

  14. ProjectConstraints • FEMA 100-yr Floodplain • Boundary (Red) • Sewer Line Amendments • (Blue) • Grading Costs (Gray) • Pedestrian Greenway • Access • Maintenance

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