Potentiometric surface of the Floridan aquifer, Southwest Florida Water Management District, May 1982

Barr, G.L.; Schiner, George R.

doi:10.3133/ofr82697

Cited by 5 publications

(8 citation statements)

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“…The data utilized and the results of the vertical travel-time calculations for the 11 well fields located in the leaky confined part of the study area are listed in table 2. Eight of the eleven well Barr (1982) and Barr and Schiner (1982). Water-table altitudes were derived from Barr (1982) and estimated from topographic maps outside the area Barr mapped.…”

Section: 'mentioning

confidence: 99%

“…Water-table altitudes outside the map area were estimated from USGS 7%-minute topographic maps. Pot -Altitude of the potentiometric surface of the Upper Floridan aquifer, in feet above sea level, at the well site, May 1982 (Barr, 1982;Barr and Schiner, 1982). £ -Drawdown of the potentiometric surface, in feet, after one day pumping at the rate shown under "Av.Q", in gallons per day, calculated by the modified nonequillibrium formula (Cooper and Jacob, 19A6, cited in Lohman, 1972, p. 19 …”

Section: 'mentioning

confidence: 99%

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

Vecchioli¹,

Hunn²,

Aucott³

1989

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Section: 'mentioning

confidence: 99%

Section: 'mentioning

confidence: 99%

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

Vecchioli¹,

Hunn²,

Aucott³

1989

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“…2. A constant-head boundary of 12 feet (Barr and Schiner, 1982a;1982b) was imposed at the inland boundary and was assumed uniform with depth.…”

Section: Ground-water Flow Modelmentioning

confidence: 99%

Potential for saltwater intrusion into the Upper Floridan aquifer, Hernando and Manatee counties, Florida

Mahon¹

1989

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Pumpage from the Upper Floridan aquifer has caused a lowering of the potentiometric surface and has increased the potential for saltwater intrusion into the aquifer in coastal areas of west-central Florida, Groundwater withdrawals are likely to increase because of the expected population growth, especially in coastal areas. To gain a better understanding of the potential for and mechanisms of saltwater intrusion, two sites were selected for study. Data were collected at each site from a centrally located deep well that completely penetrates the Upper Floridan aquifer. Digital models, based on this and other information, were developed to simulate groundwater flow and solute transport. The northern site is in Hernando County near the town ofAripeka. Tfie test well in the area was drilled about 1 mile from the coast to a depth of 820 feet. Freshwater was present in the carbonate rock aquifer to a depth of about 500 feet, and saltwater occurred in a low permeability zone from 560 feet to the base of the aquifer at about 750 feet. Between the freshwater and saltwater is the zone of transition, also referred to as the freshwater-saltwater interface. At this site, the transition zone is thin and the slope is fairly steep. Aquifer tests indicated that high permeability occurs between 450 and 500 feet, which accounts for a transmissivity of 56,000 feet squared per day. The southern site is in Manatee County near the town of Rubonia. Drilling of the test well was completed at 1,260 feet, just below the base of the Upper Floridan aquifer. The transition zone in this well occurs between 875 and 975 feet. Transmissivity in the study area was determined to be about 8,500 feet squared per day and is anomalously low, especially in contrast to the transmissivity on the other side of Tampa Bay in Pinellas County. Specific-capacity tests andflowmeter logs indicate that more than 80 percent of the flow comes from the upper 124 feet of uncased well between 462 and 586 feet. Hie digital models show flow patterns that are similar to the cyclic flow of seawater and interface theory. Large groundwater withdrawals simulated in the northern study area suggest that saltwater intrusion could cause chloride concentrations to increase in freshwater supply wells in coastal areas, depending upon distance from the shoreline, well depth, and pumping rate. In the southern area, saltwater is present below Manatee County in the lower permeable zone and could migrate farther inland and to upper permeable zones as a result of pumpage for irrigation and mining. The simulations have shown that saltwater contamination of coastal wells would not be noticed as quickly as water-level declines resulting from inland pumpage. Similarly, improvements to water quality in coastal wells will not be apparent as quickly as rising water levels resulting from restoration of groundwater resources.

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“…The decline over the past 50 years is shown in figure 12, which was generalized from a 1934 potentiometric-surface map presented by Kaufman (1967, p. 16) and the May 1984 potentiometric-surface map by Barr and Schiner (1984). It is probable that the long-term decline in discharge in the Peace River is related to the decline of artesian water levels in the underlying Floridan aquifer system.…”

Section: Trend Analysesmentioning

confidence: 99%

Land use, water use, streamflow characteristics, and water-quality characteristics of the Charlotte Harbor inflow area, Florida

Hammett¹

1990

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Potentiometric surface of the Floridan aquifer, Southwest Florida Water Management District, May 1982

Cited by 5 publications

References 0 publications

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

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

Potential for saltwater intrusion into the Upper Floridan aquifer, Hernando and Manatee counties, Florida

Land use, water use, streamflow characteristics, and water-quality characteristics of the Charlotte Harbor inflow area, Florida

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