USGS Open-File Report 00-515
Floridan Aquifer System
Water levels in the Floridan aquifer system were monitored in 80 wells in 1999; data for 69 of these wells are summarized in this report. The Floridan aquifer system includes the Upper and Lower Floridan aquifers (table 2). In and near outcrop areas, the Upper Floridan aquifer is semiconfined and water levels in wells tapping the aquifer fluctuate seasonally in response to variations in recharge rate and pumping (Clarke and others, 1990). Near the coast, where the Upper Floridan aquifer is confined, water levels respond primarily to pumping, and fluctuations related to recharge are less pronounced (Clarke and others, 1990, p. 31). Most of the water withdrawn from the Floridan aquifer system is from the Upper Floridan aquifer; a few wells in the Savannah area withdraw water from the Lower Floridan aquifer. In this report, wells that tap both the Upper and Lower Floridan aquifers or wells located in an area of the State where the Upper and Lower Floridan aquifers cannot be distinguished are listed as the Floridan aquifer; data from these wells are available as PDF files, accessible by clicking on the well number in the map below or from Table 3b.
On September 15, 1999, the National Weather Service issued a hurricane warning for coastal Georgia due to the approach of Hurricane Floyd. In response to the warning, the Georgia Emergency Management Agency ordered the evacuation of coastal cities, including Savannah, Brunswick, and St. Marys. Many municipal and industrial water suppliers in the area temporarily ceased or reduced pumpage in wells tapping the Floridan aquifer system during the evacuation.
Figure 21. Location of observation wells completed in the Floridan aquifer system.
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Last updated Monday, 26-Jun-2000 15:14:18 EDT
The URL for this page is http://ga.water.usgs.gov/publications/ofr00-151/floridan.html