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Potential for downward leakage to the Floridan Aquifer, Green Swamp area, central Florida

Water-Resources Investigations Report 77-71

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Abstract

A qualitative evaluation of the potential for downward leakage from the surficial sand aquifer to the underlying Floridan aquifer was made for the Green Swamp area (about 870 sq mi) in central Florida. Downward leakage, or recharge, is limited under natural conditions owing to the nearness to land surface of the potentiometric surface of both the sand aquifer and the underlying Floridan aquifer. Continuous cores of the unconsolidated section were obtained at 74 sites in the study area and were evaluated for downward leakage potential based on grain-size distribution. Sand percentage was estimated for each interval or bed from microscopic examination of the core samples. The four maps prepared from this data show sand thickness, clay thickness, relative vertical hydraulic conductivity of the confining beds and the relative potential for downward leakage. About 20 percent (178 sq mi) of the area classified has a relatively good potential for downward leakage; almost 50 percent of the area has a relatively poor potential. (Woodard-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Potential for downward leakage to the Floridan Aquifer, Green Swamp area, central Florida
Series title:
Water-Resources Investigations Report
Series number:
77-71
Edition:
-
Year Published:
1977
Language:
ENGLISH
Publisher:
U.S. Geological Survey in cooperation with the Southwest Florida Water Management District,
Description:
5 maps and 1 cross section ;on sheet 71 x 96 cm. fold. to 28 x 21 cm. in envelope 31 x 23 cm. --