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Variations in Water Levels and Chloride Concentrations in the Floridan Aquifer System in Duval County, Florida

By Rick M. Spechler

The topic is Coastal Erosion. Open-File Report 02-426
Water Use
Long-Term Chloride Concentration Trends
Selected References
image of Duval County, Florida
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Water Use

Ground-water withdrawals from the Floridan aquifer system in northeastern Florida accounted for about 90 percent of the total freshwater use in 1999. Water-use data have been collected by the U.S. Geological Survey and the St. Johns River Water Management District since 1965. In 1965, total ground-water withdrawals in Duval and surrounding counties (St. Johns, Clay, and Nassau) was about 191 million gallons per day (Mgal/d), of which 127 Mgal/d was from Duval County (Marella, 1995). In 1999, withdrawals increased to about 272 Mgal/d, of which 152 Mgal/d was from Duval County. Of the total water used in Duval County in 1999, 74 percent was for public supply, 11 percent for commercial-industrial self-supplied, 9 percent for domestic self-supplied, 3 percent for thermoelectric power generation, 2 percent for recreational, and 1 percent for agricultural irrigation (R.L. Marella, U.S. Geological Survey, written commun., 2002).

Graph showing total ground-water use in Duval County and adjacent counties, Florida, 1965-1999.
Figure 2. Total ground-water use in Duval County and adjacent counties, Florida, 1965-1999 (from Marella, 1995, 1999; and R.L. Marella, U.S. Geological Survey, written commun., 2000). [ ]


Figures: Click on a caption to view the figure. U.S. Department of the Interior | U.S. Geological Survey
Water Resources Discipline, Florida

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