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Digital elevations and extents of regional hydrogeologic units in the Northern Atlantic Coastal Plain aquifer system


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Pope, J.P., Andreasen, D.C., McFarland, E.R., and Watt, M.K., 2016, Digital elevations and extents of regional hydrogeologic units in the Northern Atlantic Coastal Plain aquifer system from Long Island, New York, to North Carolina (ver. 1.1, January 2021) : U.S. Geological Survey data release,


A digital model of the sedimentary Northern Atlantic Coastal Plain aquifer system is composed of 20 rasters and hydrogeologic unit extent polygons. Rasters describe the top elevations of regional aquifers and confining units at a resolution of 2640 feet (1/2 mile). The rasters are clipped to the extent polygons, which represent the spatial extents of the hydrogeologic units onshore and several miles offshore. This three-dimensional hydrogeologic model was constructed as part of a U.S. Geological Survey Groundwater Resources Program study of groundwater availability in the Northern Atlantic Coastal Plain (NACP) aquifer system, including parts of New York, New Jersey, Delaware, Maryland, Virginia, and North Carolina. Digital elevations [...]


Attached Files

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“NACP Framework Cover Image”
thumbnail 3.31 MB image/jpeg
“Unit Elevation Raster Files”
1.69 MB application/x-7z-compressed
“Unit Elevation ASCII Files”
1.93 MB application/x-7z-compressed
“Unit Extent Polygon Shapefiles”
413.06 KB application/x-7z-compressed
“Version History File”
1.06 KB text/plain
“Version 1.1 Revision Details”
325.51 KB application/vnd.openxmlformats-officedocument.wordprocessingml.document


The hydrogeologic-unit elevations included in this regional compilation incorporate the work of many geologists and hydrologists and span more than a century of investigation. The unit extents and elevations included here were constructed to support regional analysis of the groundwater flow system and are appropriately used only at this scale because of the assumptions, approximations, and generalizations necessary for regional analysis. Individual referenced studies and data should be used for investigations at the local and state levels.

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