Lake Raleigh Wetland Creation Feasibility Study - PowerPoint PPT Presentation

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Lake Raleigh Wetland Creation Feasibility Study

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... Native wetland vegetation -- Wildlife Habitat Pedestrian ... Semi-natural landscape with planned ... Lake Raleigh Wetland Creation Feasibility ... – PowerPoint PPT presentation

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Title: Lake Raleigh Wetland Creation Feasibility Study


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 1990s

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 (contd)
  • 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
Lizards Tail
Buttonbush
Spicebush
Jack-in-the-Pulpit
Swamp Rose
Photos courtesy of USDA PLANTS Database http//pla
nts.usda.gov/
14
Project Constraints
  • FEMA 100-yr Floodplain
  • Boundary (Red)
  • Sewer Line Amendments
  • (Blue)
  • Grading Costs (Gray)
  • Pedestrian Greenway
  • Access
  • Maintenance
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