Open-File Report 99-185
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Broska, J.C., and Barnette, H.L., 1999, Hydrogeology and Analysis of Aquifer
Characteristics in West-Central Pinellas County, Florida: U.S. Geological Survey
Open-File Report 99-185, 23 p.
The U.S. Geological Survey, in cooperation with Pinellas County, Florida,
conducted an investigation to describe the hydrogeology and analyze the aquifer
characteristics in west-central Pinellas County. A production test well and
four monitor wells were constructed in Pinellas County at Walsingham Park during
1996-97. Water-quality sampling, static and dynamic borehole geophysical surveys,
and hydraulic tests were conducted at the wells to delineate the hydrogeology at
Walsingham Park. A 9-day aquifer test was conducted to determine the hydraulic
characteristics of the aquifer system and observe the changes in water quality
due to pumping.
A numerical model was constructed to simulate the aquifer test and calculate
values for hydraulic conductivity and storage coefficient for permeable zones
and confining units at Walsingham Park. Final calibrated values for hydraulic
conductivity for the different permeable zones and confining units at the test
site were 18 feet per day for Upper Zone A, 750 feet per day for Lower Zone A,
1 foot per day for Zone B, 1x10-4 feet per day for the intermediate confining
unit, and 10 feet per day for the semiconfining unit separating Upper Zone A
and Lower Zone A. Final calibrated values for storage coefficient were 3.1x10-4
for Upper Zone A, 8.6x10-5 for Lower Zone A, 2.6x10-5 for Zone B, 3.1x10-4 for
the intermediate confining unit, and 4.3x10-5 for the semiconfining unit
separating Upper Zone A and Lower Zone A. Estimates of transmissivity for Upper
Zone A and Lower Zone A were about 2,500 and 37,500 feet squared per day,
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