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Water Table Contours in the Upper Glacial and Magothy Aquifers, April-May 2016

Dates

Start Date
2016-04-15
End Date
2016-05-26
Publication Date

Citation

Finkelstein, J.S., and Como, M.D., 2018, Geospatial dataset of water-table and potentiometric-surface altitudes in the upper glacial, Magothy, and Lloyd aquifers of Long Island, New York, April–May 2016: U.S. Geological Survey data release, https://doi.org/10.5066/F7G15Z9T.

Summary

The U.S. Geological Survey (USGS) is providing online maps of water-table and potentiometric-surface altitude in the upper glacial, Magothy, Jameco, Lloyd, and North Shore aquifers on Long Island, New York, April–May 2016. Also provided is a depth-to-water map for Long Island, New York, April–May 2016. The USGS makes these maps and geospatial data available as REST Open Map Services (as well as HTTP, JSON, KML, and shapefile), so end-users can consume them on mobile and web clients. A companion report, U.S. Geological Survey Scientific Investigations Map 3398 (Como and others, 2018; https://doi.org/10.3133/sim3398) further describes data collection and map preparation and presents 68x22 in. Portable Document Form (PDF) versions, [...]

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Attached Files

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USGS_ID_green.png thumbnail 9.68 KB image/png
2016_Water_Table_Contours.CPG 5 Bytes text/plain
2016_Water_Table_Contours.dbf 2.83 KB application/unknown
2016_Water_Table_Contours.prj 562 Bytes text/plain
2016_Water_Table_Contours.sbn 932 Bytes x-gis/x-shapefile
2016_Water_Table_Contours.sbx 180 Bytes x-gis/x-shapefile
2016_Water_Table_Contours.shp 824.21 KB x-gis/x-shapefile
2016_Water_Table_Contours.shx 732 Bytes x-gis/x-shapefile
Extension: WaterTableContours_Python.zip
thumbnail.png thumbnail 3.92 KB

Purpose

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 424 monitoring wells (observation and supply wells) and 15 streamgage locations across Long Island during April–May 2016 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 using the groundwater measurements. The water-table contours were interpreted using water-level data collected from 13 streamgages, 2 lake gages, 275 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 88 wells (61 observation wells and 27 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 60 wells (55 observation wells and 5 supply wells) screened in the Lloyd aquifer and the contiguous and hydraulically connected North Shore aquifer. Editing of the geospatial data was conducted in ArcGIS Desktop (Esri, 2015a) using geographic information system (GIS) tools. All water-level altitudes are referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).

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