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NORTH ALBEMARLE REGION HYDROGEOLOGIC FRAMEWORK

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Description:

The North Albemarle region lies north of the Albemarle Sound and east of the Chowan River, including Camden, Chowan, Currituck, Gates, Pasquotank, and Perquimans Counties. This area is in great need of additional water sources in order to accommodate a growing population spilling into northeastern North Carolina from rapid growth of the Hampton Roads, Virginia area. Currituck, Camden, and Pasquotank Counties have the most serious water supply problems, inasmuch as they are operating at or near their maximum water production rates.
The purpose of the North Albemarle Ground Water Study is to construct an up-to-date hydrogeologic framework of the area of concern, which includes the following NC counties: Camden, Chowan, Currituck, Gates, Pasquotank, Perquimans, eastern Bertie, and Hertford, and the following southeastern VA counties: the southern areas of Southampton, Isle of Wight, Suffolk and Chesapeake. Southeastern VA counties were included in the framework in order to establish, for ground water modeling purposes, the continuity of the aquifer system from NC into the Franklin pumping center. The hydrogeologic framework study was accomplished by correlation and interpretation of borehole geophysical and lithologic logs, water level and chloride measurements taken from observation wells, aquifer test data, and Time Domain Electromagnetic Soundings. Three deep wells were constructed by the Division of Water Resources in 1994-95 in order to provide subsurface information where little was available.
The sedimentary deposits of the study area have been differentiated into geologic formations and formation members based on lithologic and pateontologic consistencies. Differentiation of the sediment wedge into component aquifers and confining units is based upon the mapping of hydraulically connected permeable beds, the boundaries of which do not necessarily correspond to formation boundaries.
Six major regional aquifers were identified in the study, as well as the intervening confining layers that separate them. They include the surficial, Yorktown, Castle Hayne, Beaufort, upper and lower Cape Fear aquifers. Each aquifer unit was mapped and described in as much detail as available data would allow in order to define them in terms of regional elevation, thickness and lateral distribution, hydraulic properties, relationship to stratigraphic units, ground water flow, and chloride distribution. The approximate positions of the 250, 500, and 10,000 ppm chloride interfaces were plotted for each aquifer.

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Record Details:

Record Type:WEB SITE
Product Published Date:06/09/2000
Record Last Revised:12/10/2002
Record ID: 15340