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FGDC CSDGM Metadata
FALSE
potomac_010_fluidresidencetime
002
1702762.500000
1842254.078300
17734.994900
471966.943800
1
0.000
Projected
GCS_WGS_1984
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FGDC
Bureau of Economic Geology
10100 Burnet Rd. Bldg. 130
Austin
TX
78729
US
8-5
20230601
ArcGIS Metadata
1.0
BEG
10100 Burnet Rd. Bldg 139
Austin
Texas
78758
US
Enterprise Geodatabase Feature Class
0.000
Potomac Fluid Residence Time
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="text-align:Justify;"><SPAN><SPAN>Several authors characterized regional ground-water flow in the lower Potomac interval (Trapp and Meisler, 1992; Leahy and Martin, 1993; Trapp and Horn, 1997; Pope and Gordon, 1999). However, these studies focus on measuring and/or modeling hydraulic head in areas where the lower Potomac aquifer is shallow and contains fresh water, and their maps cover only areas that are inland (up dip) of the area of interest in this study. Meisler and others (1984) analyzed the effect of Pleistocene sea-level change on the saltwater/fresh-water interface in deep aquifers below the coastal plain. They concluded that the saltwater/fresh-water interface moves very little with major sea-level changes, which implies that the fluid residence times in these deep aquifers is very long and undoubtedly exceeds the age of the last major sea-level low, which was about 18,000 yr BP. Hence, in the GIS, we represent fluid residence times across eastern New Jersey, Delaware, and Maryland as more than 18,000 yr.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Fluid Residence Time for the Potomac Group
Leahy, P. P., and Martin, Mary, 1993, Geohydrology and simulation of ground-water flow in the Northern Atlantic Coastal Plain aquifer system: U.S. Geological Survey Professional Paper 1404-K, 81 p.
Meisler, H., Leahy, P. P., and Knobel, L. L., 1984, Effect of eustatic sea-level changes on salt-water-freshwater in the northern Atlantic coastal plain: U.S. Geological Survey Water-Supply Paper 2255, 28 p.
Pope, D. A., and Gordon, A. D., 1999, Simulation of ground-water flow and movement of the freshwater-saltwater interface in the New Jersey coastal plain: U.S. Geological Survey Water-Resources Investigations Report 98-4216, 159 p.
Trapp, H., Jr., and Horn, M. A., 1997, Ground water atlas of the United States—segment 11, Delaware, Maryland, New Jersey, North Carolina, Pennsylvania, Virginia, West Virginia: U.S. Geological Survey Hydrologic Investigations, Atlas No. HA-730-L, 30 p.
New Jersey
Delaware
Maryland
Lower Potomac Group
Lower Potomac Group
Maryland
Delaware
New Jersey
Access constraints: Restriction Code: other restrictions; Other Constraints: Access constraints: None
See access and use constraints information.
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potomac_010_fluidresidencetime
Feature Class
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OBJECTID
OBJECTID
OID
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Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
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Feature geometry.
ESRI
Coordinates defining the features.
SEG_ID
SEG_ID
Double
8
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FLUIDRESID
FLUIDRESID
String
12
0
0
source_organization
Source Organization
String
255
0
0
hyperlink
Link
String
255
0
0
resource_date
Date of Resource
String
255
0
0
Shape_Leng
Shape_Leng
Double
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38
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st_area(shape)
st_area(shape)
Double
0
0
0
st_perimeter(shape)
st_perimeter(shape)
Double
0
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