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N.C. Department of Environment and Natural Resources

NC Department of Environment and Natural Resources
Coastal Management - Oceanfront Construction Setback & Erosion Rates

Coastal Management

Oceanfront Construction Setback Factors

Maps prepared by:
N.C. Division of Coastal Management, Policy & Planning Section, 2014

North Carolina's oceanfront construction setback factors are calculated using the  long-term (approximately 50 years) average annual shoreline change rates for the sole purpose of establishing oceanfront construction Setback Factors, and the Ocean Erodible Areas of Environmental Concern (OEA AEC), which were initially established by the Coastal Resource Commission (CRC) under the Coastal Area Management Act (CAMA) in 1979 .

Oceanfront shoreline change rates have been calculated using the end-point method since the first study completed in 1979. This method simply uses the earliest and most current shoreline data points where they intersect any given shore-perpendicular transect line. The distance between the two shorelines (shore-transect intersect) divided by the time between the two establishes the rate. The use of current mapping and spatial analysis technology make this process repeatable and precise; ESRI's Geographic Information Systems (GIS), and USGS's Digital Shoreline Analysis System (DSAS). To explore shoreline change rates (or erosion and accretion rates) simply use the Google Map provided to zoom in/out, and click on green (accretion) or red (erosion) transect lines to see the rates (feet/year).

Oceanfront Erosion & Accretion Rates:
 
        Accretion
        Erosion
         No Change
Shoreline Change Rates (ft/yr) - click transect to view info window.
Legend (show/hide)

Oceanfront construction setback is measured landward from the first line of stable natural vegetation, or a static vegetation line when applicable. Setback distance is determined by two variables; (1) size of structure; (2) a setback factor based on shoreline position change rates (see table below). As specified in Rule 15A NCAC 7H .0304(1)(a), the minimum setback factor is 2, unless the shoreline is eroding at a rate greater than 2 feet per year. Therefore, when the shoreline is accreting (moving seaward), or eroding at a rate less than 2 feet per year, the default setback factor is 2. The Google Map below is provided to illustrate current setback factors.

Structure Size Setback (ft) example using setback factor = 2
less than 5,000 sqft 60 feet or 30 times the setback factor 2 x 30 = 60 feet
greater than or equal to 5,000 sqft 120 feet or 60 times the setback factor 2 x 60 = 120 feet
greater than or equal to 10,000 sqft 130 feet or 65 times the setback factor 2 x 65 = 130 feet
greater than or equal to 20,000 sqft 140 feet or 70 times the setback factor 2 x 70 = 140 feet
greater than or equal to 40,000 sqft 150 feet or 75 times the setback factor 2 x 75 = 150 feet
greater than or equal to 60,000 sqft 160 feet or 80 times the setback factor 2 x 80 = 160 feet
greater than or equal to 80,000 sqft 170 feet or 85 times the setback factor 2 x 85 = 170 feet
greater than or equal to 100,000 sqft 180 feet or 90 times the setback factor 2 x 90 = 180 feet

Oceanfront Construction Setback Factors:
Legend (show/hide)
        SBF = 2
        SBF = 2.5 to 4
         SBF = 4.5 to 6
         SBF = 6.5 to 8
         SBF > 8
         SBF/OEA Transition Boundary
Construction Setback Factors (SBF) - click lines to view info window.


The shoreline position change rate information presented here is not predictive, nor does it reflect the short-term erosion that can occur during storms. The associated report describes the methodology used to calculate both shoreline position change rates and setback factors, and also provides a summary of rates. The document is not considered to be a "state of the shoreline report," nor was it designed to address "why" the shoreline is accreting or eroding. The most current oceanfront development setback factors and erosion rates depicted in these data were adopted (February-2013) by the Coastal Resources Commission for incorporation into oceanfront setback rules. Please contact your CAMA Local Permit Officer or the nearest regional field office of the N.C. Division of Coastal Management for more information.

DCM's Oceanfront Interactive Map Viewer is an interactive map illustrating historic oceanfront data. Currently this site works best with Internet Explorer® (IE). The Division is actively working to release a new map viewer in the summer of 2014 that will function on multiple web browser platforms.

2 0 1 3   R e p o r t   &   M a p s Type / size click link below
Report (with all maps included at end of report) .pdf / 30.1MB Download
Data Summary .pdf / 3MB Download
Maps - Brunswick County .pdf / 15.7MB Download
Maps - Carteret County .pdf / 20MB Download
Maps - Currituck County .pdf / 8.8MB Download
Maps - Dare County .pdf / 27.2MB Download
Maps - Hyde County .pdf / 3MB Download
Maps - New Hanover County .pdf / 12.2MB Download
Maps - Onslow County .pdf / 10MB Download
Maps - Pender County .pdf / 5.2MB Download
2 0 1 3  S h o r e l i n e   C h a n g e   G I S   D a t a Type / size click link below
Setback Factors Shapefile (polygon) Download
Transects 50-meter (includes raw, smoothed, & blocked erosion rate data) Shapefile (line) Download
2009 Shoreline (wet/dry) Shapefile (line) Download
"Early" Shoreline (1942-1962) Shapefile (line) Download

Note: Setback factors became effective on February 01, 2013 (Analaysis and report were completed in 2011).

 

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