An edition of: WaterAtlas.orgPresented By: Seminole County, USF Water Institute

Water-Related News

Portions of central Florida received more than 20 inches of rainfall in September


PALATKA, Oct. 12, 2022 — A majority of the St. Johns River Water Management District received well above average rainfall in September thanks to Hurricane Ian. County-wide rainfall totals for the past 12 months ranged from a high of 72.3 inches in Seminole County to a low of 29.9 in Nassau County.

A full report outlining September hydrologic conditions was presented at the District’s Governing Board meeting Tuesday. Highlights include:


  • Districtwide, September rainfall averaged 12.78 inches, which is 6.04 inches above the average for the month.
  • Districtwide, the cumulative rainfall total for the past 12 months is 56.70 inches, which is 5.69 inches above the long-term average.


  • Upper Floridan aquifer conditions (groundwater levels) at the end of September were mostly in the normal to high range across the District.
  • Groundwater levels expressed as a single Districtwide index are at the 68th percentile Districtwide. This means that since 1980, aquifer levels have been higher than they currently are about 22 percent of the time.

Spring flows

  • The mean monthly flow at Silver Springs increased to 641 cubic feet per second (cfs), or 415 million gallons per day (mgd), which is a 42 cfs increase from August’s mean and remains in the normal range for this time of year.
  • At the Blue Spring station in Volusia County, the mean monthly flow was 146 cfs, or 94 mgd.
  • At Rock Springs, the monthly mean flow increased 3 cfs to 62 cfs (40 mgd), which is in the normal range for September.
  • Mean monthly flow at Wekiwa Springs increased to 65 cfs (42 mgd), which is in the normal range for the time of year.

To learn more about rainfall totals and other hydrologic data collected, visit?

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