Potentiometric surface of the upper Floridan Aquifer, west-central Florida, May 1989

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“…The WKP reaches an elevation of ~20 m at the scarp. Two of Florida's largest springs occur within it: the Spring Creek group at the coast, collectively having the Coastal Carbonate Aquifer Sensitivity to Tides Sumatra Tsunami Affects Observations by GRACE Satellites (including Wakulla Springs and Spring Creek), typical potentiometric contours [Barr, 1987]…”

Hydrogeology and results of tracer tests at the old Tampa well field in Hillsborough County, with implications for wellhead-protection strategies in west-central Florida

“…Estimated water-level altitudes were used as the starting head values in model nodes that do not contain wells. The configuration of the potentiometric surface within the study area remained unchanged between May 1988 (Lewelling, 1989), September 1988(Barr, 1989, and September 1989 (Knochenmus and Barr, 1990), but did fluctuate about 10 ft. Based on the history of water-level fluctuations within the study area, the potentiometric surface for July 1990 was estimated by subtracting 4 ft of altitude from the potentiometric-surface altitudes of September 1989 (Knochenmus and Barr, 1990). Water levels in wells at the old Tampa well field were used as starting heads for the model nodes in which the wells were located.…”

Evaluation of methodology for delineation of protection zones around public-supply wells in west-central Florida

“…The degree to which inappropriate areas are included within the delineated protection zones can be assessed by considering a range of gradients typical of the slope of the potentiometric surface in west-central Florida. From potentiometric-surface maps of the Upper Floridan aquifer (Barr, 1985b;Barr and Lewelling, 1986), it is seen that the hydraulic gradient varies from near zero to a maximum of about 0.001. Table 8 compares the downgradient distance to the stagnation point with the radial distance calculated from the volumetric equation for typical pumping rates, aquifer characteristics, and gradient extremes.…”