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Town of Southport

Created by Spencer Rogers on May 23, 2014  
Role: Other; committee member

General
Construction Cost: 
>$250K
Construction Dates: 
Estimated
1991
Southport , NC
United States
33° 55' 10.0956" N, 78° 0' 46.7316" W
North Carolina US
Pre-Project Conditions
Submerged Aquatic Vegetation (SAVs) present?: 
No
Bank elevation above MHW: 
5.0 feet
Pre-Construction Erosion Present?: 
Yes
Pre-Construction Erosion at Adjacent Parcels?: 
Yes
Existing Structures or Debris?: 
Yes
Describe Existing Structures or Debris at the Site: 
1 bulkhead, several piers
Environmental Considerations
Name of Waterbody: 
Cape Fear River
Site Classification: 
Straight
Maximum Exposed Fetch Distance: 
4.00 miles
Shoreline orientation relative to max. fetch distance: 
75 Degrees
Tidal Range: 
4.6 feet
Adjacent to Navigation Channel?: 
Yes
Boat wake exposure: 
High
Project Site Within a Designated No-Wake Zone?: 
No
Salinity: 
High: 30 ppt and above
100-year Flood Elevation Seaward of the Shoreline: 
12.0 feet
100-Year Flood Elevation Vertical Datum: 
NAVD88
Design Considerations
Was fill brought in?: 
No
Area of shallow bottom conversion to marsh: 
1,500 sq ft
Length of Project: 
500 feet
Average Project Width: 
30 feet
Width of Wetlands Above MHW: 
5 feet
Width of Wetlands Below MHW: 
30 feet
Structural Elements
Describe construction materials: 
Mix of granite, concrete riprap and marine limestone. 250 pound average
Average distance of structure offshore (from existing MHW/NHW): 
30 feet
Structure Base Width: 
10.0 feet
Length of Structure: 
500 feet
Structure Crest Width: 
1.0 foot
Area of shallow bottom conversion to structure: 
5,000 square feet
Width of Open Water Between Structure and Wetlands: 
2 feet
Structure Side Slope (V:H): 
1:1.5
Structure Monolithic or Layered: 
Monolithic
Height of Structure Above MHW: 
2.0 feet
Maximum depth at seaward edge of structure: 
2.5 feet
Maximum depth at landward edge of structure (including fill): 
2.0 feet
Drop downs, or openings or overlaps?: 
Yes
Width of drop downs or openings: 
5.0 feet
Spacing between gaps/ drop-downs: 
100 feet
Type of foundation: 
None
Was geotextile used in foundation?: 
I Dont Know
Porosity of structure: 
High
Non-Structural Elements
Percentage of vegetative cover between structure and MHW line: 
95%
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: 
30 feet
Project Performance
Overall performance of Living Shoreline for erosion protection?: 
Medium
Overall performance of the habitat enhancement?: 
Medium
Storm Exposure: 
Yes
Storm Intensity: 
Medium
Other Comments: 
Some settlement of stone. Needs an extra foot of stone but so far marsh successful.