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Scientific Investigations Map 3066

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### Prepared in cooperation with the  NASSAU COUNTY DEPARTMENT OF PUBLIC WORKS  NEW  YORK CITY DEPARTMENT OF ENVIRONMENTAL PROTECTION  NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION  SUFFOLK COUNTY DEPARTMENT OF HEALTH SERVICES  SUFFOLK COUNTY WATER AUTHORITY  TOWN OF EAST HAMPTON  TOWN OF NORTH HEMPSTEAD  TOWN OF SHELTER ISLAND  TOWN OF SOUTHAMPTON  AND THE U.S. ENVIRONMENTAL PROTECTION AGENCY 

## Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifersbeneath Long Island, New York, March-April 2006

#### By Jack Monti, Jr., and Ronald Busciolano

|      Sheet 1 - Water table     Sheet 2 - Potentiomtric surface in     the Magothy and Jameco aquifers     Sheet 3 - Potentiomtric surface in      the Lloyd and North Shore aquifer     Sheet 4 - Depth to water tableIntroduction               The U.S. Geological Survey (USGS), in cooperation with State and local agencies, systematically collects ground-water data at varying measurement frequencies to monitor the hydrologic situation on Long Island, New York. Each year during March and April, the USGS conducts a synoptic survey of hydrologic conditions to define the spatial distribution of the water table and potentiometric surfaces within the three main water-bearing units underlying Long Island—the upper glacial, Magothy, and Lloyd aquifers. These data and the maps constructed from them are commonly used in studies of Long Island's hydrology, and by water managers and suppliers for aquifer management and planning purposes.                Water-level measurements made in 502 wells across Long Island during March-April 2006, were used to prepare the maps in this report. Measurements were made by the wetted-tape method to the nearest hundredth of a foot. Water-table and potentiometric-surface altitudes in these aquifers were contoured using these measurements. The water-table contours were interpreted using water-level data collected from 341 wells screened in the upper glacial aquifer and (or) shallow Magothy aquifer; the Magothy aquifer's potentiometric-surface contours were interpreted from measurements at 102 wells screened in the middle to deep Magothy aquifer and (or) contiguous and hydraulically connected Jameco aquifer; and the Lloyd aquifer's potentiometric-surface contours were interpreted from measurements at 59 wells screened in the Lloyd aquifer or contiguous and hydraulically connected North Shore aquifer. Many of the supply wells are in continuous operation and, therefore, were turned off for a minimum of 24 hours before measurements were made so that the water levels in the wells could recover to the level of the potentiometric head in the surrounding aquifer. Full recovery time at some of these supply wells can exceed 24 hours; therefore, water levels measured at these wells are assumed to be less accurate than those measured at observation wells, which are not pumped. In this report, all water-level altitudes are referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).   | First posted April 6, 2009
- **Map text content** (PDF 118 KB) 
- **Sheet 1 (Water table)** PDF (39.4MB)
- Sheet 2 (Potentiometric surface in the Magothy and Jameco aquifers)  PDF         (33.6 MB)
- Sheet 3 Potentiometric surface in the Lloyd and North Shore aquifers  PDF (32.8 MB)
- Sheet 4 (Depth to water table)  PDF (34.9 MB)
Project page with USGS Long Island depth-to-water tool, online mapviewer, and GIS data
Files are not 508 compliant. For further information, contact the New York Water Science Center Director.

**For additional information contact:**DirectorU.S. Geological SurveyNew York Water Science Center 425 Jordan Road Troy, NY 12180 (518)285-5600
http://ny.water.usgs.gov
Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
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### Suggested citation:

Monti, Jack, Jr., and Busciolano, Ronald, 2009, Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifersbeneath Long Island, New York, March-April 2006: U.S. Geological Survey, Scientific Investigations Map 3066, 4 sheets.

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U.S. Department of the Interior |		U.S. Geological Survey		                                    URL: https://pubsdata.usgs.gov/pubs/sim/3066/		Page Contact Information: Contact USGS		Page Last Modified: Thursday, 01-Dec-2016 17:13:52 EST