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Summary of the Hydrology of the Floridan Aquifer System In Florida and In Parts of Georgia, South Carolina, and Alabama
By Richard H. Johnson and Peter W. Bush
Professional Paper 1403-A
Hydraulic Properties of the Aquifer System
The permeability of the Floridan varies greatly because of differences in the character of its water-bearing materials. These materials include: (1) detrital units of foraminiferal remains and coarse sand-sized particles that hydraulically act as sand or gravel; (2) micritic limestone in the Florida panhandle that acts hydraulically as silt or clay; (3) networks of many small solution openings along joints or bedding planes that on a gross scale provide a uniform distribution of permeability; and (4) large cavernous openings developed in karst or paleokarst areas.
In areas where the Floridan is characterized by the first three types, diffuse flow predominates; however, in areas with large cavernous openings, conduit flow predominates.
For the areas where diffuse flow predominates, the methods of aquifer-test analysis developed for porous media are applicable. The response curves of aquifer tests outside the karst terrains generally match the classic nonleaky, leaky, or delayed-yield type curves. Many tests in the confined areas are characterized by a Theis (nonleaky) response throughout nearly the entire test duration. In contrast, porous-media flow theory cannot be applied, at least on a local scale, in the karst areas where conduit flow predominates. However, on a regional scale, analyses of the ground-water flow system using flow nets and "coarse-mesh" digital models have been done successfully in the karst areas, as discussed in Professional Papers 1403-C through H.
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 04 September, 2013 @ 02:04 PM(TJE)