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| U.S. Geological Survey Open-File Report 2006-1394 |
OFR 2006-1394
Prepared in cooperation with the
St. Johns River Water Management District
South Florida Water Management District
Southwest Florida Water Management District
2006
Potentiometric Surface of the Upper Floridan Aquifer in the St. Johns River
Water Management District and Vicinity, Florida, May 2006
By Sandra L. Kinnaman
Introduction
This map depicts the potentiometric surface of the Upper Floridan aquifer in the St. Johns River
Water Management District and vicinity for May 2006. Potentiometric contours are based on
water-level measurements collected at 599 wells during the period May 14-31, near the end
of the dry season. Some contours are inferred from previous potentiometric-surface maps with
larger well networks. The potentiometric surface of the carbonate Upper Floridan aquifer
responds mainly to rainfall, and more locally, to ground-water withdrawals and springflow.
Potentiometric-surface highs generally correspond to topographic highs where the aquifer
is recharged. Springs and areas of diffuse upward leakage naturally discharge water from
the aquifer and are most prevalent along the St. Johns River. Areas of discharge are reflected
by depressions in the potentiometric surface. Ground-water withdrawals locally have lowered the
potentiometric surface. Ground water in the Upper Floridan aquifer generally flows from
potentiometric highs to potentiometric lows in a direction perpendicular to the contours.
Additional Reference
Long-term hydrographs of ground-water levels for continuous and periodic wells are available at
http://waterdata.usgs.gov/fl/nwis/gw
Suggested Citation:
Kinnaman, S.L., 2006, Potentiometric surface of the Upper Floridan aquifer in the St. Johns River
Water Management District and vicinity, Florida, May 2006: U.S. Geological Survey Open-File Report 2006-1394, 1 sheet.
For Additional Information, contact:
U.S. Department of the Interior
U.S. Geological Survey
12703 Research Parkway
Orlando, FL 32826
407-803-5531
kinnaman@usgs.gov
