Prepared in cooperation with the
Southwest Florida Water Management District
Select an option:
Hantush Modified Leaky Artesian Method and Hantush and Jacob leaky Artesian Method
Jacob Leaky Artesian Method
Neuman and Witherspoon Ratio Method
Summary and Conclusions
An aquifer test conducted in the Green Swamp area December 15-16, 1975 was designed to stress the uppermost part of the Floridan aquifer so that the leakage characteristics of the overlying confining bed could be determined.
A well tapping the upper part of the Floridan aquifer was pumped at a rate of about 1,040 gal/min for 35 hours; drawdown was measured in the Floridan aquifer and in two horizons in the confining bed. Analysis of the data indicates that the transmissivity of the upper 160 feet of the Floridan is about 13,000 ft2/d, the storage coefficient is about 2.5 x 10-4, and the overlying confining bed leakance coefficient is about 2 x 10-2 to 2.5 x 10-2d-1. The vertical hydraulic diffusivity of the confining bed ranged from 610 to 16,000 ft2/d.
Results of the test indicate that, in the area of the test site, a floridan aquifer well field would induce additional recharge to the Floridan. As a result of that increased recharge, water levels in the surficial aquifer would tend to stand lower, runoff from the area would tend to be less, and, perhaps, evapotranspiration would be less than normal.
For information, contact:
U.S. Geological Survey
10500 University Center Dr.
Tampa, FL 33612-6427
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Last modified: Thursday, September 01 2005, 02:24:57 PM