Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1999

Bradner, L.A.; Knowles, Leel

doi:10.3133/ofr99608

Cited by 2 publications

(4 citation statements)

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“…The Silver Springs ground-water basin, as delineated on the basis of the potentiometric surface of the Upper Floridan aquifer in May 1999 (Bradner and Knowles, 1999), encompasses about 1,200 mi 2 in north-central Florida ( fig. 1), although fluctuations in the altitude of the potentiometric surface can result in minor variations in the size of the basin.…”

Section: Description Of Study Areamentioning

confidence: 99%

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Chemistry of ground water in the Silver Springs basin, Florida, with an emphasis on nitrate

Phelps¹

2004

Scientific Investigations Report

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The Silver Springs group, in central Marion County, Florida, has a combined average discharge rate of 796 cubic feet per second and forms the headwaters of the Silver River. The springs support a diverse ecosystem and are an important cultural and economic resource. Concentrations of nitrite-plus-nitrate (nitrate-N) in water from the Main Spring increased from less than 0.5 milligrams per liter (mg/L) in the 1960s to about 1.0 mg/L in 2003. The Upper Floridan aquifer supplies the ground water to support spring discharge. This aquifer is at or near land surface in much of the groundwater basin; nutrients leached at land surface can easily percolate downward into the aquifer. Sources of nitrogen in ground water in the Silver Springs basin include atmospheric deposition, fertilizers used by agricultural and urban activities, and human and animal wastes. mixing of water from both shallow and deep flow zones, the fact that the water is relatively young (less than 30 years) indicates the importance of minimizing nitrogen loading within a contributing area that has groundwater travel times of 30 years or less.

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Section: Description Of Study Areamentioning

confidence: 99%

“…The Upper Floridan aquifer also has well-developed secondary porosity and is highly transmissive; thus, nutrient-enriched ground water can flow a given distance within a relatively short period of time (weeks to months). May 1999 (from Bradner andKnowles, 1999).…”

Section: Introductionmentioning

confidence: 99%

Chemistry of ground water in the Silver Springs basin, Florida, with an emphasis on nitrate

Phelps¹

2004

Scientific Investigations Report

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“…6), when withdrawals from the aquifer are near maximum and water levels generally are near their annual low. The potentiometric surface ranged from about 53 ft to about 17 ft above sea level (Bradner and Knowles, 1999). Water levels in May 1999 averaged about 1 to 7 ft lower than in September 1998.…”

Section: Ground-water Flow System and Water Levels In The Floridan Aqmentioning

confidence: 96%

“…Potentiometric surface of the Upper Floridan aquifer, May 1999 (modified fromBradner and Knowles, 1999). altitude at which water level would have stood in tightly cased wells.…”

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confidence: 99%

Variations in water levels and chloride concentrations in the Floridan aquifer system in Duval County, Florida

Spechler¹

2002

Open-File Report

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Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1999

Cited by 2 publications

References 0 publications

Chemistry of ground water in the Silver Springs basin, Florida, with an emphasis on nitrate

Chemistry of ground water in the Silver Springs basin, Florida, with an emphasis on nitrate

Variations in water levels and chloride concentrations in the Floridan aquifer system in Duval County, Florida

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