Open-File Report 2007-1215
Prepared in cooperation with
St. Johns River Water Management District
South Florida Water Management District
Southwest Florida Water Management District
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Summary of Hydrologic Conditions
Measured values of the potentiometric surface ranged from 8 feet below NGVD 29 near Fernandina Beach, Florida, to 127 feet above NGVD29 in Polk County, Florida. The average water level of the network in September 2006 was about a foot higher than the average in May 2006 following below-average rainfall during the previous 9 months. Seasonal differences in network average water levels generally range from 4 to 6 feet. For 553 wells with previous measurements, September 2006 levels ranged from about 19 feet below to about 37 feet above May 2006 water levels. Water level increases of 20 feet or more occurred in 5 of the 12 wells measured in Polk County and all 3 wells measured in Hardee County.
For 554 wells with previous measurements, September 2006 levels ranged from about 21 feet below to about 6 feet above September 2005 water levels. Water levels decreased more than 20 feet in only 1 of the 13 wells measured in southeastern Georgia. The average water level of the network in September 2006 was about 3 feet lower than the average in September 2005.
Kinnaman, S.L., and Dixon, J.F., 2007, Potentiometric Surface of the Upper Floridan Aquifer in the St. Johns River Water Management District and Vicinity, Florida, September 2006: U.S. Geological Survey Open-File Report 2007-1215, 1 sheet.
U.S. Geological Survey
Florida Integrated Science Center
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Orlando, FL 32826
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