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Description: This data set consists of digital contours that represent the altitude of water table in the upper glacial and Magothy aquifer beneath Long Island, New York. The U.S. Geological Survey constructed a water table altitude map using ground-water levels measured in the upper glacial and Magothy aquifers during the spring of 2013. Water-level data were collected from 335 wells to construct the contours at a map scale of 1:125,000. The water table altitude contours were digitized and compared to 1997, 2006, and 2010 potentiometric-surface altitude maps . The variable contour interval ranges from 5 to 120 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 1 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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Description: This groundwater divide feature was approximated from and interpolated water table raster for Long Island, April-May 2016. Generally, the highest altitudes of the water table were used to draw the groundwater divide, which implies the groundwater flow direction. The feature is presented in Sheet 1 of Scientific Investigations Map XXXX.

Copyright Text: Prepared in cooperation with: Nassau County Department of Public Works, New York State Department of Environmental Conservation, Port Washington Water District, Sands Point Water Department, Suffolk County Department of Health Services, Suffolk County Water Authority, Town of North Hempstead, Town of Shelter Island, Manhasset-Lakeville Water District and Water Authority of Great Neck North.

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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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Description: This data set consists of digital points that represent the water level altitude in the upper glacial and Magothy aquifers of Long Island, New York. The U.S. Geological Survey measured 334 observation wells and 1 supply well screened in the upper glacial and Magothy aquifers. This geographic information systems (GIS) data set is a digital representation of the water levels presented in sheet 1 of Scientific Investigations Map 3326.

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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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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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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Layer: Potentiometric surface of the Lloyd & North Shore aquifers (10)

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Layer: Inferred limit of the North Shore aquifer (12)

Parent Layer: Potentiometric surface of the Lloyd & North Shore aquifers

Name: Inferred limit of the North Shore aquifer

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Layer: Line of equal potentiometric-surface altitude (contour interval 5 feet) (13)

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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.

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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Layer: Monitoring well (upper number is station name; lower number is water-surface altitude, in feet) (14)

Parent Layer: Potentiometric surface of the Lloyd & North Shore aquifers

Name: Monitoring well (upper number is station name; lower number is water-surface altitude, in feet)

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Description: This data set consists of digital points that represent the water level altitude in the Lloyd and North Shore aquifers of Long Island, New York. The U.S. Geological Survey measured 58 observation wells and 8 supply wells screened in the Lloyd aquifer and the contiguous and hydraulically connected North Shore aquifer. This geographic information systems (GIS) data set is a digital representation of the water levels presented in sheet 3 of Scientific Investigations Map 3326.

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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