Layers:

Layer: Potentiometric surface of the Lloyd & North Shore aquifers (0)

Sub Layers:
• Inferred limit of the Lloyd aquifer
• Inferred limit of the North Shore aquifer
• Line of equal potentiometric-surface altitude (contour interval 5 feet)
Name: Potentiometric surface of the Lloyd & North Shore aquifers

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Layer: Inferred limit of the Lloyd aquifer (1)

Name: Inferred limit of the Lloyd aquifer

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Layer: Inferred limit of the North Shore aquifer (2)

Name: Inferred limit of the North Shore aquifer

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Layer: Line of equal potentiometric-surface altitude (contour interval 5 feet) (3)

Name: Line of equal potentiometric-surface altitude (contour interval 5 feet)

Display Field: CONTOUR

Type: Feature Layer

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Description: This data set consists of digital contours that represent the potentiometric-surface altitude of water in the Lloyd and contiguous North Shore aquifer beneath Long Island, New York. The U.S. Geological Survey constructed a potentiometric-surface altitude map using ground-water levels measured in the Lloyd and North Shore aquifers during the spring of 2013. Water-level data were collected from 66 wells to construct the contours at a map scale of 1:125,000. The potentiometric-surface altitude contours were digitized and compared to 1997, 2006, and 2010 potentiometric-surface altitude maps . The 5 foot contour interval ranges from -10 to 60 feet above the National Geodetic Vertical Datum of 1929. This geographic information systems (GIS) data set is a digital representation of the potentiometric-surface contours presented in sheet 3 of Scientific Investigations Map 3270.

Definition Expression: N/A

Copyright Text: Prepared in cooperation with: Long Island Water Conference, Nassau County Department of Public Works, New York City Department of Environmental Protection, Port Washington Water District, Suffolk County Department of Health Services, Towns of North Hempstead and Shelter Island, Manhasset-Lakeville Water District

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