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Aquifer Storage and Recovery (ASR) Performance and Recovery in Southern Florida

Aquifer Storage and Recovery (ASR) Performance and Recovery in Southern Florida. Ronald S. Reese U.S. Geological Survey Center for Water and Restoration Studies Miami, FL. OUTLINE. Introduction to aquifer storage and recovery (ASR)

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Aquifer Storage and Recovery (ASR) Performance and Recovery in Southern Florida

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  1. Aquifer Storage and Recovery (ASR) Performance and Recovery in Southern Florida Ronald S. Reese U.S. Geological Survey Center for Water and Restoration Studies Miami, FL

  2. OUTLINE • Introduction to aquifer storage and recovery (ASR) • Factors affecting recovery of fresh water in a brackish aquifer • Overview of ASR sites and their performance

  3. The ASR Cycle • Each ASR cycle includes a period of injection (recharge), storage, and then withdrawal (recovery) with each of these periods lasting days or months (or years?). • Ideally, in southern Florida recharge is done during the wet season and recovery during the dry season.

  4. Definitions of Recovery Efficiency Total Recovery Efficiency: Total volume of water recovered as a percentage of volume of water recharged during a cycle Potable Water Recovery Efficiency: Volume of potable water (chloride concentration < 250 mg/L) recovered as a percentage of volume of water recharged during a cycle

  5. Ideal ASR Storage ZoneSome Factors to Consider for Successful ASR as Defined by Recovery Efficiency of Potable Water in a Brackish Aquifer: • Well Confined • Low Salinity • Moderate Transmissivity • Uniform Distribution of Permeability (Low Dispersion) • Structural High • Thin Open Interval and Storage Zone • Top of Storage Zone at Top of Aquifer

  6. ASR Well Diagram

  7. BOYNTON BEACH EAST WTP ASR-1 Transmissivity: 9,400 ft-squared/day Ambient Chloride Concentration: 1,900 mg/L

  8. Boynton Beach ASR Cycle Data

  9. SUNRISE SPRINGTREE ASR-1 Transmissivity: 5,700 ft-squared/day Chloride Concentration: 3,600 mg/L

  10. City of Sunrise- Springtree ASR Cycle Testing VolumesSource of diagram: (MongomeryWatson Harza) >22% (up to Cl conc of only 171 mg/L 28% Recovery Efficiency Recharge Volume On cycle 6: 187 Mgal Recovery Efficiency On cycle 7 was 62% 38% 38% 28% 20% 2000 2001

  11. MIAMI-DADE WEST WELL FIELD ASR-1 Transmissivity: 15,000 ft-squared/day Chloride Concentration: 2,000 mg/L Recovery Efficiency: for 3rd cycle: 41% for all 3 ASR wells Operating together Recharge Volume of 714 Mgal

  12. SAN CARLOS ESTATES, BONITA SPRINGS ASR-1 Transmissivity: 70,000 ft2/day Chloride: Concentration 1,100 mg/L Recovery Efficiency: 3% on 2th Cycle, Recharge Volume For last cycle of 138 Mgal

  13. LAKE OKEECHOBEE TAYLOR CREEK- NUBBIN SLOUGH ASR-1 Transmissivity: 586,000 ft-squared/day Chloride Concentration: 2,910 mg/L Recovery Efficiency: 7% on 7th Cycle Recharge Volume: 355 Mgal

  14. CERP KISSIMEE RIVER ASR TEST MONITOR WELL Specific Capacity Of storage zone in Large Diameter Exploratory ASR Well: ?

  15. CONCLUSIONS • Good improvement in potable water recovery efficiency • has occurred in the east coast area with 60 to 80% recovery • not uncommon • However, recovery efficiency can be greatly reduced by • hydrogeologic factors – primarily transmissivity, • dispersivity and ambient salinity • Other factors that could also be important: • Storage zone not located at the top of the aquifer • Storage zone too thick • Structure at the top of the aquifer not favorable • Long delays have occurred at many sites because of • mechanical problems, regulatory issues, or lack of source • water. • In some inland areas, such as around Lake Okeechobee, • the transmissivity of potential target storage zone could be • too high or too low

  16. Sunrise Springtree ASR-1

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