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:
Rainfall
- 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.
- 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.
Original source can be found here.
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