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Duke University Marine Laboratory

Created by Drew Harrison on Jan 08, 2015  
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General
Construction Dates: 
Estimated
2002
135 Duke Marine Lab Road
Beaufort , NC
United States
34° 43' 2.7984" N, 76° 40' 23.4912" W
North Carolina US
Pre-Project Conditions
Major Plant Species Present: 
None
Submerged Aquatic Vegetation (SAVs) present?: 
No
Bank elevation above MHW: 
1.8 feet
Pre-Construction Erosion Present?: 
No
Pre-Construction Erosion at Adjacent Parcels?: 
No
Existing Structures or Debris?: 
Yes
Describe Existing Structures or Debris at the Site: 
Asbestos sheet bulkhead with pier pilings & offshore fish pen
Environmental Considerations
Name of Waterbody: 
Gallant’s Channel
Maximum Exposed Fetch Distance: 
1.00 miles
Shoreline orientation relative to max. fetch distance: 
30 Degrees
Tidal Range: 
3.0 feet
Adjacent to Navigation Channel?: 
Yes
Boat wake exposure: 
Medium
Project Site Within a Designated No-Wake Zone?: 
No
Salinity: 
High: 30 ppt and above
Description of Nearby Structures: 
Island is mostly bulkheaded with a bridge & causeway to the north
Design Considerations
Was fill brought in?: 
Yes
Type of Fill: 
Sand
Amount of Fill: 
800 cubic yards
Area of shallow bottom conversion to marsh: 
9,100 sq ft
Area of upland conversion to marsh: 
7,500 square feet
Length of Project: 
300 feet
Structural Elements
Did the project involve a structure?: 
Yes
Type of Structure: 
rubble-mound sill
Describe construction materials: 
Class II granite
Average distance of structure offshore (from existing MHW/NHW): 
50 feet
Structure Base Width: 
13.0 feet
Length of Structure: 
300 feet
Structure Crest Width: 
2.0 feet
Area of shallow bottom conversion to structure: 
3,750 square feet
Structure Side Slope (V:H): 
1:0.7
Structure Monolithic or Layered: 
Monolithic
Height of Structure Above MHW: 
3.5 feet
Drop downs, or openings or overlaps?: 
Yes
Width of drop downs or openings: 
11.0 feet
Spacing between gaps/ drop-downs: 
100 feet
Type of foundation: 
Geotextile Fabric
Was geotextile used in foundation?: 
Yes
Non-Structural Elements
Percentage of vegetative cover between structure and MHW line: 
90%
Was erosion fabric used for soil stabilization?: 
No
Primary Wetland species below MHW: 
Spartina alterniflora (smooth cordgrass)
Primary wetland species above MHW: 
Spartina patens (saltmeadow cordgrass)
Root mat developed by vegetation?: 
Yes
Cross-section width of planted area: 
73 feet
Additional expected ecological benefits from project?: 
Oyster growth on sill structure
Project Performance
Overall performance of Living Shoreline for erosion protection?: 
Medium
Overall performance of the habitat enhancement?: 
Medium

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