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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

Lake Raleigh Wetland CreationFeasibility Study

NC State Centennial Campus

Melanie Carter, Jennifer Burdette, Amanda Jones

slide2

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
slide3

Feasibility Study Components

  • Existing Conditions
    • Site Description and Land Use
    • Physical & Natural Resources
      • Soils
      • Hydrology
      • Vegetation
      • Geology
      • Flood Hazard
    • Cultural Resources
slide4

Feasibility Study Components

(cont’d)

  • Chain-of-Title
  • Environmental Hazard Assessment
  • Jurisdictional Issues
    • Waters of the US (Section 404)
    • Protected Species
    • Riparian Buffers
  • Constraints
existing site conditions
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
jurisdictional issues
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
slide11

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

slide12

Conceptual Wetland DesignCross-section

Pedestrian

Trail

Existing Grade

Proposed Grade

Seasonal

High Water

Table

Perennial

Stream

suggested wetland plants
Suggested Wetland Plants

Lizard’s Tail

Buttonbush

Spicebush

Jack-in-the-Pulpit

Swamp Rose

Photos courtesy of USDA PLANTS Database

http://plants.usda.gov/

slide14

ProjectConstraints

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