THE ORIGIN AND AGE OF SPRING WATERS IN THE ST JOHNS RIVER WATER MANAGEMENT DISTRICT, CENTRAL FLORIDA

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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

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PURPOSE

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

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Study Area (In SJRWMD)
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Fig. 1 Study Area
D
U
U
D
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Fig. 2 Thickness of the Confining Unit
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Fig 3. Elevation of the Floridan Aquifer
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Fig 4. Thickness of the MSCU
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Fig 5. Elevation of the Top of the Lower Floridan
Aq.
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CALCIUM BICARBONATE
SODIUM CHLORIDE
SODIUM CHLORIDE, CALCIUM BICARBONATE
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Fig 6. Water Quality
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Fig 7. May 2001 Pot Surface
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REACTIONSCALCIUM BICARBONATE SPRINGS

• Rain Water a CH2O b CaCO3 c CaMg(CO3)2 d
  O2 Spring Water

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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

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REACTIONSSODIUM CHLORIDE, CALCIUM BICARBONATE
SPRING

• Rain Water Lower Floridan Water a CH2O b
  CaCO3 c CaMg(CO3)2 d O2 Spring Water

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CONCLUSION

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