St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District
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Water bodies, watersheds and storm water
Droty Spring main view

Droty Spring main view

Droty Spring pool

Droty Spring pool

Droty Spring run

Droty Spring run

Droty Spring

Lake County

Description

Droty Spring is a fourth-magnitude spring that discharges from sand boils in a small, circular pool at the bottom of a ravine. The sandy spring run is about 4 feet wide and flows about 500 feet toward the northeast into Seminole Creek. Oak, pine, palm, and banana trees are common in the area around the spring and run.

Discharge

Discharge at Droty Spring was measured by the U.S. Geological Survey in 1997 and by St. Johns River Water Management District in 2005 and 2008. The mean discharge is 0.65 cubic feet per second (see the table below).

Water quality

Droty Spring was sampled twice in 2004 by Lake County and once by the district in 2005. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Droty Spring

Droty Spring Min Mean Median Max Count Period
Discharge, cfs 0.59 0.65 0.65 0.72 3 1997−2008
Alkalinity, total, mg/L as CaCO3 109.0 110.6 110.7 112.0 3 2004−2005
Calcium, total, mg/L as Ca 34.2 37.3 37.1 40.6 3 2004−2005
Chloride, total, mg/L as Cl 7.1 7.2 7.1 7.3 3 2004−2005
Dissolved Oxygen 0.56 0.68 0.68 0.80 2 2004
Magnesium, total, mg/L as Mg 9.5 10.2 10.0 11.1 3 2004−2005
Nitrate + nitrite, total, mg/L as N 0.03 0.03 0.03 0.03 1 2004
Orthophosphate, total, mg/L as P 0.08 0.08 0.08 0.08 1 2005
pH, field 7.60 7.79 7.79 7.97 3 2004−2005
Phosphorus, total, mg/L as P 0.08 0.08 0.08 0.08 1 2005
Potassium, total, mg/L as K 0.6 0.7 0.7 0.8 2 2004
Sodium, total, mg/L as Na 4.1 4.3 4.3 4.5 2 2004−2005
Specific conductance, field, µmhos/cm at 25°C 298 303 305 305 3 2004−2005
Specific conductance, lab, µmhos/cm at 25°C 291 291 291 291 1 2005
Sulfate, total, mg/L as SO4 28.9 30.2 30.2 31.4 2 2004−2005
Total dissolved solids, mg/L 167 175 176 183 3 2004−2005
Water temperature, °C 23.8 24.0 24.0 24.2 3 2004−2005
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

Age of discharge water

The age of water discharging from Droty Spring was determined by measuring the concentration of tritium, carbon-14, and carbon-13 in the spring discharge, which was measured in March 2005. Droty Spring had a tritium concentration of 0.95 tritium units and a carbon-14 concentration of 31 percent modern carbon and a delta carbon-13 value of −8.86 parts per thousand. The tritium concentration suggests that the water is less than 50 years old. The carbon-14 concentration of 31% modern carbon can result from the reaction of rainfall with calcite, dolomite, and soil organic matter.

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St. Johns River Water Management District
4049 Reid Street, Palatka, FL 32177
(800) 725-5922