This project will investigate the recharging of excess natural surface water into the Upper Floridan aquifer more than 1,000 feet below the land’s surface. The recharged water will help improve groundwater levels and reduce the rate of saltwater intrusion from the Gulf of Mexico in the SWUCA’s Most Impacted Area.
SWUCA Recovery and Natural System Improvement
In 2017, the District conducted a feasibility study at Flatford Swamp in Manatee County that evaluated an aquifer recharge project using up to two million gallons a day (mgd) of excess surface water draining into Flatford Swamp.
The fully operational Flatford Swamp project may help recover groundwater levels by recharging up to 10 mgd in the Most Impacted Area of the SWUCA, reducing the rate of saltwater intrusion. Another benefit of removing water from the swamp is it will help restore the swamp’s natural hydrologic period and vegetation patterns.
Staff plans to implement a step-by-step analysis conducting additional data collection, monitoring and computer modeling to ensure the project concept is thoroughly evaluated.
A pilot study of the surface water recharging began in late 2020, which will act as a small-scale version of the recharge project. The purpose is to test the level of possible pre-treatment of surface water with sodium bisulfite before recharge.
The recharge project will be implemented only if it is found to be safe for the water resources and beneficial for groundwater levels.
In January 2017, the District held a public meeting prior to FDEP’s issuance of a permit. In April 2017, the District’s Governing Board unanimously approved the project. During late 2017 and early 2018, staff worked on sampling the source water as well as retaining a consultant engineer and a driller.
During the stakeholder engagement process, the District received inquiries from the agricultural community about water quality. In coordination with the UF/IFAS Plant Diagnostic Center, District staff confirmed that there was no presence of Phytophthora, a mold that could impact certain agricultural crops, in the surface water. Testing will continue at least twice a year.
Rowe Drilling conducted drilling on all four wells at the Flatford site. Drilling of the final well was completed in April of 2019. Jones Edmonds completed the design of the diversion infrastructure and TLC Diversified began construction in August 2020.
Construction is tentatively scheduled to be complete in late August 2021. The intake structure and borehole control valve installation is complete. Progression of the recharge building, recharge pump and chemical feed shed is more than 75% complete. Development of the DEP UIC permit extension request is underway. Because of May 2021 permitting discussion with DEP, staff is currently looking at revising the treatment concept to the use of chloramines for additional disinfection.
Planning of the operational testing phase has been delayed and is anticipated to start before the end of the year. Testing will begin when the site is operational and will look at water quality at the monitor wells.
A wetland monitoring project is being conducted by District staff to track any changes to hydrology and vegetation that may be caused by the recharge well operation.
The District will continue to work with key stakeholders and potentially affected parties. Please contact the project manager with any questions.
Step 1: Desktop and modeling evaluation. Permit test well. – Complete
Step 2: Drill test and monitor wells. Collect aquifer characteristics and water quality. – Complete
Step 3: Conduct pilot study and construct diversion infrastructure. – late 2020 to late 2021
Step 4: Begin recharge surface water test. Continue appropriate testing. – late 2021 to 2022
Step 5: Evaluate all testing results. – 2023