5 thoughts on “Aerials: I-75 to Withlacoochee (south) River 2017-02-07”

1. Janet Barrow March 13, 2017 at 4:49 pm

   Please check the MFL levels for Gum Slough Springs. I was told by a SWFWMD employee at the recent Rainbow Springs MFL meeting that the MFL was set at 9 % for Gum Slough Springs. I did find this Minimum Flows for Gum Slough Spring Run Addendum resource from October, 2016 (https://www.swfwmd.state.fl.us/projects/mfl/reports/GumSprings/FinalAddendum-Gum_Slough_Spring_Run-Appendices.pdf):

   CHAPTER 7 – CONCLUSION
   Because the original minimum flows analyses for Gum Slough Spring Run described in a 2011
   revised report were based on a relatively short flow record, a decision was made to gather more
   information to support more robust minimum flow recommendations for the system. The flow
   record was increased from seven to ten years, and the previously peer-reviewed analyses used
   for the original minimum flows determination were repeated.
   Results of the new analyses yielded an updated minimum flow recommendation that would allow
   up to a six percent reduction in flows due to water withdrawals, based on a potential 15 percent
   decrease of available habitat for adult spotted sunfish in the spring run. The updated minimum
   flow recommendation also includes the recommended stipulation that surface water withdrawals
   are prohibited from depressing flows below 43 cfs. The adopted minimum flow will be reevaluated
   within ten years.
   Updated groundwater modeling results indicated that the predicted streamflow decline for Gum
   Slough Spring Run at the USGS Gum Springs near Holder gage site under current pumping
   conditions is approximately 3.4 percent. Based on this information, a recovery strategy is not
   required for the proposed minimum flows.
2. Janet Barrow March 13, 2017 at 4:55 pm

   Look at the first photo – “Sabal Trail north from I-75 to the Withlacoochee (south) River.” This shows the hydrostatic discharge point for Spread 5 (at least the site they reported that they will use) and the withdrawal point for Spread 6. Coordinates are: 28°52’47.99″N, 82° 5’39.69″W
   1. Janet Barrow March 13, 2017 at 5:07 pm

      Also, they show 9,710,000 gallons being discharged into this pond for Spread 5 and 7,200,000 gallons being withdrawn from this pond for Spread 6 hydrostatic testing. The Maximum Discharge Rate (gallons per minute) for these activities is 9,000 gallons per minute. Source: Resource Report 2, Water Use and Quality, Table 2.3-10 (November, 2014).

      Does anyone have any new information about their hydrostatic testing water withdrawals and discharges? 9,710,000 gallons equals 30 acre-feet of water. This is about a 5-6 acre pond. Maximum discharge rate of 9,000 gallons per minute is quite a bit of force.

      What are their other sites for other Spreads? Have they been investigating alternative sites? If so, where? How long does it take to expel the water from each test?

3. Pingback: Sabal Trail hydrostatic test pond at I-75 @ WWALS 2017-02-07 | WWALS Watershed Coalition (Suwannee RIVERKEEPER®)

4. Pingback: Gum Springs 3,000 feet from Sabal Trail and lower flow @ WWALS 2017-02-07 | WWALS Watershed Coalition (Suwannee RIVERKEEPER®)

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