USGS

 

WRIR 82-35

Prepared in cooperation with the
Southwest Florida Water Management District

 

1982


Aquifer Test Results, Green Swamp Area, Florida

C.H. Tibbals and H.F. Grubb


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Abstract

Introduction

     Well-Numbering System

Hydrogeologic Setting

Aquifer Test

     Well Construction

     Data Collection

     Data Analysis

          Hantush Modified Leaky Artesian Method and Hantush and Jacob leaky Artesian Method

          Jacob Leaky Artesian Method

          Neuman and Witherspoon Ratio Method

Summary and Conclusions

Selected References

Abstract

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.


Suggested Citation:

Tibbals, C.H., and Grubb, H.F., 1982, Aquifer test results, Green Swamp area, Florida: U.S. Geological Survey Water-Resources Investigations Report 82-35, 29 p.

For information, contact:

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10500 University Center Dr.
Tampa, FL 33612-6427


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