Lake Raleigh Wetland Creation Feasibility Study NC State Centennial Campus Melanie Carter, Jennifer Burdette, Amanda Jones

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 Project Description

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

(cont’d) o Chain-of-Title o Environmental Hazard Assessment o Jurisdictional Issues Waters of the US (Section 404) Protected Species Riparian Buffers o Constraints

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

Existing Site Conditions – Soils

Existing Conditions -- Hydrology DETAIL

Existing Site Conditions

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

Conceptual Wetland Design DETAIL 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 Ephemeral Drainage Proposed Levee Area to be Leveled

Conceptual Wetland Design Cross-section Seasonal High Water Table Existing Grade Proposed Grade Perennial Stream Pedestrian Trail

Suggested Wetland Plants Lizard’s Tail Swamp Rose Spicebush Buttonbush Jack-in-the-Pulpit Photos courtesy of USDA PLANTS Database

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