Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1994

D. M. Schiffer; A. M. O’Reilly; G. G. Phelps; L. A. Bradner; K. J. Halford; R. M. Spechler

doi:10.3133/ofr94495

Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1994

Open-File Report 94-495

By: D. M. Schiffer, A. M. O’Reilly, G. G. Phelps, L. A. Bradner, K. J. Halford, and R. M. Spechler

https://doi.org/10.3133/ofr94495

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Abstract

This map depicts the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1994. The map is based on water-level measurements made at approximately 1,000 wells and several springs. Data on the map were contoured using 5-foot contour intervals in most areas. The potentiometric surface of this karstic aquifer generally reflects land surface topography. Potentiometric surface highs often correspond to topographic highs, which are areas of surficial recharge to the Upper Floridan aquifer. Springs within topographic lows along with areas of more diffuse upward leakage are natural zones of discharge. Municipal, agricultural, and industrial withdrawals have lowered the potentiometric surface in some areas. The potentiometric surface ranged from 125 feet above sea level in Polk County to 32 feet below sea level in Nassau County. Water levels in May 1994 generally were 0 to 3 feet lower than those measured in May 1993. Water levels in May 1994 in northeast Florida generally were 0 to 3 feet higher than in September 1993, except in the lower St. Johns River basin, where water levels were 0 to 4 feet lower than in September 1993. In the rest of the mapped area, water levels in May 1994 generally were 0 to 4 feet lower than those measured in September 1993.

Suggested Citation

Schiffer, D., O’Reilly, A.M., Phelps, G.G., Bradner, L.A., Halford, K.J., and Spechler, R., 1994, Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1994: U.S. Geological Survey Open-File Report 94-495, 1 over-size sheet., https://doi.org/10.3133/ofr94495.

ISSN: 2331-1258 (online)

Additional publication details
Publication type	Report
Publication Subtype	USGS Numbered Series
Title	Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1994
Series title	Open-File Report
Series number	94-495
DOI	10.3133/ofr94495
Year Published	1994
Language	ENGLISH
Description	1 over-size sheet.