Parent Layer: Potentiometric surface of the Magothy & Jameco aquifers

Name: Line of equal potentiometric-surface altitude (contour interval 10 feet)

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Description: This data set consists of digital contours that represent the potentiometric-surface altitude of water in the Magothy and contiguous Jameco aquifer beneath Long Island, New York. The U.S. Geological Survey constructed a potentiometric-surface altitude map using ground-water levels measured in the Magothy and Jameco aquifers during the spring of 2013. Water-level data were collected from 101 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 10 foot contour interval ranges from 0 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 2 of Scientific Investigations Map 3270.

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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