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Scientific Investigations Map 3148

Prepared in cooperation with the
Southwest Florida Water Management District

Potentiometric Surface of the Upper Floridan Aquifer, West-Central Florida, September 2010

By A.G. Ortiz

Thumbnail image of map


This report, prepared by the U.S. Geological Survey in cooperation with the Southwest Florida Water Management District, is part of a semi-annual series of Upper Floridan aquifer potentiometric-surface map reports for west-central Florida. Potentiometric surface maps have been prepared for January 1964, May 1969, May 1971, May 1973, May 1974, and for each May and September since 1975. Water-level data are collected in May and September each year to show the approximate annual low and high water-level conditions, respectively.

This map report shows the potentiometric surface of the Upper Floridan aquifer measured in September 2010. The potentiometric surface is an imaginary surface connecting points of equal altitude to which water will rise in tightly-cased wells that tap a confined aquifer system (Lohman, 1979). This map represents water-level conditions near the end of the wet season, when groundwater levels usually are at an annual high and withdrawals for agricultural use typically are low. The cumulative average rainfall of 53.17 inches for west-central Florida (from October 2009 through September 2010) was 0.41 inches above the historical cumulative average of 52.76 inches (Southwest Florida Water Management District, 2010). Historical cumulative averages are calculated from regional rainfall summary reports (1915 to most recent complete calendar year) and are updated monthly by the Southwest Florida Water Management District.

First posted February 11, 2011

  • Map PDF (2.6 MB) (34 x 34 inches)

For additional information contact:
A.G. Ortiz
U.S. Geological Survey
The University Center for Business
10500 University Center Drive
Suite 215
Tampa, FL 33612-6427

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.

Suggested citation:

Ortiz, A.G., 2011, Potentiometric surface of the Upper Floridan aquifer, west-central Florida, September 2010: U.S. Geological Survey Scientific Investigations Map 3148, 1 sheet, scale 1:500,000.

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