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by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G.

THE ORIGIN AND AGE OF SPRING WATERS IN THE ST JOHNS RIVER WATER MANAGEMENT DISTRICT, CENTRAL FLORIDA. by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G. U. S. Geological Survey. PURPOSE.

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by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G.

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  1. THE ORIGIN AND AGE OF SPRING WATERS IN THE ST JOHNS RIVER WATER MANAGEMENT DISTRICT,CENTRAL FLORIDA by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G. U. S. Geological Survey

  2. PURPOSE Determine the origin and age of water discharging from 11 springs in the St. Johns River Water Management District

  3. Study Area (In SJRWMD)

  4. Fig. 1 Study Area D U U D

  5. Fig. 2 Thickness of the Confining Unit

  6. Fig 3. Elevation of the Floridan Aquifer

  7. Fig 4. Thickness of the MSCU

  8. Fig 5. Elevation of the Top of the Lower Floridan Aq.

  9. CALCIUM BICARBONATE SODIUM CHLORIDE SODIUM CHLORIDE, CALCIUM BICARBONATE

  10. Fig 6. Water Quality

  11. Fig 7. May 2001 Pot Surface

  12. REACTIONSCALCIUM BICARBONATE SPRINGS Rain Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 =Spring Water

  13. REACTIONSSODIUM CHLORIDE SPRINGS Rain Water + Lower Floridan Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 = Spring Water Upper Floridan Water + Lower Floridan Water + b CaCO3 = Blue Spring Upper Floridan Water + Lower Floridan Water = Salt Springs

  14. REACTIONSSODIUM CHLORIDE, CALCIUM BICARBONATE SPRING Rain Water + Lower Floridan Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 = Spring Water

  15. CONCLUSION Water discharging from these springs are locally derived and contain variable amounts of recently recharged water.

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