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Scientific Investigations Map 3091

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### Prepared in cooperation with St. Johns River Water Management District, South Florida Water Management District, and Southwest Florida Water Management District

## Potentiometric surface of the Upper Floridan  aquifer in the St. Johns River Water Management District and vicinity, Florida,  May 2009

#### By Sandra L. Kinnaman and Joann F. Dixon

| Introduction
This  map depicts the potentiometric surface of the Upper Floridan aquifer in the St.  Johns River Water Management District and vicinity for May 2009. Potentiometric  contours are based on water-level measurements collected at 625 wells during  the period May 14 – May 29, 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 groundwater withdrawals and spring  flow. 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. Groundwater withdrawals locally have  lowered the potentiometric surface. Groundwater in the Upper Floridan aquifer  generally flows from potentiometric highs to potentiometric lows in a direction  perpendicular to the contours.   | Revised May 23, 2011
        Posted August  2009
- **Full report**PDF (8.4 MB)

**For additional information contact:**Sandra L. Kinnaman          U.S. Geological Survey          12703 Research Parkway                Orlando, FL 32826

**Additional References:**      Additional potentiometric surface maps of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity (September 2000 – May 2009) are available at http://fl.water.usgs.gov/Orlando/PotMap/.Long-term hydrographs of groundwater levels for continuous and periodic wells are available at  http://waterdata.usgs.gov/fl/nwis/gw/.

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:

Kinnaman, S.L., and Dixon, J.F., 2009, Potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, May 2009: U.S. Geological Survey Scientific Investigations Map 3091, 1 sheet.

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U.S. Department of the Interior |		U.S. Geological Survey		                                    URL: https://pubsdata.usgs.gov/pubs/sim/3091/		Page Contact Information: Contact USGS		Page Last Modified: Thursday, 01-Dec-2016 17:17:16 EST