Stream and Lake Average Water-Level Altitudes, April-May 2013

Publication Date

2022-11-17

Start Date

2013-04-15

End Date

2013-04-30

Como, M.D., Finkelstein, J.S., Monti, Jack, Jr., and Busciolano, Ronald, 2022, Geospatial dataset of water-table and potentiometric-surface altitudes in the upper glacial, Magothy, and Lloyd Aquifers of Long Island, New York, April-May 2013: U.S. Geological Survey data release, http://doi.org/10.5066/F7RV0KSD.

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Each year during April and May, the USGS conducts a synoptic survey of water levels to define the spatial distribution of the water table and potentiometric surfaces within the three main water-bearing units (aquifers) underlying Long Island—the upper glacial, Magothy, and Lloyd aquifers and the hydraulically connected Jameco and North Shore aquifers. These data and the maps constructed from them are commonly used in studies of Long Island’s hydrology and are utilized by water managers and suppliers for aquifer management and planning purposes. Water-level measurements made in 502 monitoring wells (observation and supply wells) and 16 streamgage locations across Long Island during April–May 2013 were used to prepare the maps in this report. Measurements were made to the nearest hundredth of a foot using the wetted-tape method at groundwater wells and stage data at streamgaging stations were averaged for the months of April and May. Contours of water-table and potentiometric-surface altitudes were created by using the groundwater measurements. The water-table contours were interpreted using water-level data collected from 16 streamgages, 334 observation wells, and 1 supply well screened in the upper glacial aquifer or the shallow Magothy aquifer. The potentiometric-surface contours of the Magothy aquifer were interpreted from measurements at 70 observation wells and 31 supply wells screened in the middle to deep Magothy aquifer and the contiguous and hydraulically connected Jameco aquifer. The potentiometric-surface contours of the Lloyd aquifer were interpreted from measurements at 58 observation wells and 8 supply wells screened in the Lloyd aquifer and the contiguous and hydraulically connected North Shore aquifer. In SIM 3326, all water-level altitudes are referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).

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• USGS New York Water Science Center

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