<p>Depth grids were derived from water surface elevation grids
that were developed using an inverse-distance-weighting (IDW) interpolation
from annual exceedance probability (AEP) event stillwater elevations (wave
setup and storm surge) extracted at ADCIRC model-mesh nodes from CHS model runs
to support the USACE South Atlantic Coastal Study. Depth grids were derived
using raster calculator functions to subtract the underlying topographic and
bathymetric digital elevation model (DEM) that was compiled and used in CHS
model runs from the water surface elevation grid. Depth grid values are in
meters, NAVD88. The input topographic and bathymetric data sources vary, but
the best available data from NOAA’s interagency elevation inventory were
incorporated as of May 2019 for use in the CHS model runs. The topo/bathy DEM
used in the model runs was resampled across the study area to a 5-meter grid
cell. Depth grid cell sizes are approximately 10 meters, NAD 83 2011.
Post-processing of the inundation depth grids followed NOAA’s Sea level rise
inundation mapping guidelines with regards to identifying and isolating
hydrologically connected and/or low-lying areas using the region grouping
geoprocessing function and 8-sided connectivity parameters. <a href='https://coast.noaa.gov/data/digitalcoast/pdf/slr-inundation-methods.pdf' rel='nofollow ugc'>https://coast.noaa.gov/data/digitalcoast/pdf/slr-inundation-methods.pdf</a>
</p>

<p>Low-lying areas greater than 1 acre were removed from the
depth grid and are displayed as a separate layer. Both the depth grids and
low-lying area data should be considered experimental and are appropriate for
use in planning applications.<span style=''>  </span>The full
suite of Coastal Hazards System data are available at <a href='https://chs.erdc.dren.mil/' rel='nofollow ugc'>https://chs.erdc.dren.mil/</a></p>
None
[]
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