MAP (from USGS) pontentiometric/water altitude map gives elevation of fresh water lens in Upper Glacial Aquifer
Above is a U.S. Geological Survey [USGS] map of the "Water Table of the Upper Glacial Aquifer" on Eastern Long Island, New York.
WATER-TABLE CONTOUR - Shows altitude of the water table. Solid where approximately known; dashed where inferred. Contour interval 10 feet. The closer the lines, the thicker the freshwater lens.
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