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Water bodies, watersheds and storm water
Su-No-Wa Spring main view

Su-No-Wa Spring main view
1972 photo courtesy of FGS

Su-No-Wa Spring

Nassau County

Description

Su-No-Wa Spring is a sixth-magnitude spring that flows from the surficial aquifer. The spring is enclosed by a 4-foot-diameter concrete pipe buried vertically in the sand and extended with blocks to about 1.5 feet above land surface. The fine white sand bottom of the enclosed spring pool is 6.5 feet below the top of the block wall. A 2-inch-diameter horizontal overflow pipe penetrates the concrete pipe enclosure 2.8 feet below the top of the block wall. Water enters the spring pool through the sand bottom, causing small sand boils, and flows out of a concrete enclosure through the overflow pipe, which extends downslope about 30 feet to the northwest. The discharge then continues to Thomas Creek about 100 feet from the spring. Water also seeps from the sandy hillside at several other points near the enclosed spring at about the same altitude (Rosenau et al. 1977).

Discharge

Discharge at Su-No-Wa Spring was measured by the U.S. Geological Survey (USGS) from 1946 to 1972. The mean and median discharge were 0.015 and 0.014 cubic feet per second (cfs), respectively (see the table below).

Water quality

Su-No-Wa Spring was sampled four times by USGS from 1956 to 1972. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Su-No-Wa Spring

Su-No-Wa Spring Min Mean Median Max Count Period
Discharge, cfs 0.003 0.015 0.014 0.027 4 1946−1972
Alkalinity, total, mg/L as CaCO3 30.0 37.0 36.0 45.0 3 1956−1972
Calcium, dissolved, mg/L as Ca 9.6 11.5 12.0 13.0 3 1956−1972
Chloride, total, mg/L as Cl 5.0 6.0 6.0 7.0 3 1956−1972
Fluoride, dissolved, mg/L as F 0.00 0.07 0.10 0.10 3 1956−1972
Magnesium, dissolved, mg/L as Mg 0.5 2.5 2.7 4.3 3 1956−1972
Orthophosphate, total, mg/L as P 0.003 0.003 0.003 0.003 1 1972
pH, field 6.00 6.43 6.35 7.00 4 1956−1972
Phosphorus, total, mg/L as P 0.01 0.01 0.01 0.01 1 1972
Potassium, dissolved, mg/L as K 0.2 0.3 0.3 0.4 3 1956−1972
Sodium, dissolved, mg/L as Na 3.3 3.7 3.5 4.2 3 1956−1972
Specific conductance, lab, µmhos/cm at 25°C 80.0 91.0 87.0 107.0 3 1956−1972
Sulfate, total, mg/L as SO4 0.5 0.7 0.8 0.8 3 1956−1972
Total dissolved solids, mg/L 69 69 69 69 1 1972
Water temperature, °C 20.5 21.0 21.1 21.5 3 1960−1972
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

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