Update 2020-03-05: Cleaner Withlacoochee Monday, Tuesday; Suwannee unknown 2020-03-03
Whatever the Saturday contamination is, by Monday it had apparently moved downstream from FL 51 (Hal W. Adams bridge between Mayo and Luraville). Unfortunately, it is not expected to dilute or dissipate. More likely it will be unhealthy all the way to the Gulf. You can help.
Katelyn Potter of SRWMD forwarded a message from SRWMD Water Resources Chief Darlene Velez, saying “results below from samples collected Sunday 3/1/2020.”
Suwannee at US90: Fecal – 98 mpn/100ml; E. coli – 172 mpn/100ml
Suwannee at CR250: Fecal – 131 mpn/100ml; E. coli – 116 mpn/100ml
Suwannee at SR51: Fecal – 187 mpn/100ml; E. coli – 114 mpn/100ml
She depicted all those numbers as green. By our color scheme, the 172 E. coli is orange, because it’s higher than the 126 cfu/100 mL that is what longterm averages should be below. See also what do these numbers mean?
I also ran some calculations:
From Withlacoochee (Pinetta) to Suwannee (Ellaville) the dilution factor is 0.49
From Suwannee above Santa Fe River (Luraville) to Suwannee below Santa Fe River (Rock Bluff) the dilution factor is 0.78
We have several springs backflowing now with river levels up, and we are losing approximately 1000cfs to the aquifer between Ellaville and Luraville gages.
On the Suwannee the water velocities are between 1 and 1.5 mph, so the high bacteria we got at SR51 on Saturday morning should be near Manatee Springs tomorrow (Tuesday 3/3) morning and to the Gulf of Mexico sometime Wed (3/4). Based on the dilution factors above the 980 E. coli we got at SR51 is unlikely to be diluted below health threshold below the Santa Fe River.
Please let me know if you have questions. Continue reading