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Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives

Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives. STA-3/4. Presentation to STA Design Review Staff. August 21, 2002. STA 3/4. Includes S-7/S-2 and S-8/S-3 Basins Additional Inflows from C-139 Basin South Shore Drainage District S-236 Basin Lake Okeechobee.

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Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives

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  1. Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives STA-3/4 Presentation to STA Design Review Staff August 21, 2002

  2. STA 3/4 • Includes S-7/S-2 and S-8/S-3 Basins • Additional Inflows from • C-139 Basin • South Shore Drainage District • S-236 Basin • Lake Okeechobee

  3. STA-3/4 • Present Design Approx. 16,543 Acres in 3 Parallel Flow Paths • Emergent Macrophyte Marsh Current Design Basis • Under Construction, Scheduled Completion Late 2003 Legend: Existing SAV Existing Spillway Existing Pump Station Existing Control Structure Existing Seepage Pump Station

  4. Baseline Conditions • Current Design, Present Inflows Through 2014 • Current Design, Inflows Modified To Reflect Full CERP Implementation (EAA Storage Reservoirs, Phase 1 and 2) After 2014 • Only Phase 1 Authorized by WRDA 2000 • Not a CERP-sanctioned simulation, assumptions made for the BSFS which may or may not coincide with the final conceptual design for the EAA Reservoirs • Inflow TP Loads Reflect 50% Reduction Due To BMPs In EAA

  5. Baseline 2015-2056 • Hydrologic Data and inflow TP loads taken from District-furnished files • Outflows of long-term average flow-weighted mean TP concentrations estimated by method presented in Phosphorus Removal by Urban Runoff Detention Basins, W.W. Walker, Ph.D. • Preliminary In Nature • Subject to Review and Possible Substantial Modification During Design of EAA Reservoirs

  6. Baseline 2015-2056 • EAA Reservoir Modeled in 4 Components, 3 Hydraulically Linked to STA-3/4 • A1 - Runoff from NNR & Miami Canal Basins • A2 - Overflows from A1, & L.O.R.R. • B - Overflows from A2, and L.O.R.R.

  7. Baseline 2015-2056 • Component A1 • Reservoir Area = 20,400 acres • Average Inlet Concentration = 95 ppb • Average Outlet Concentration = 65 ppb Estimated Long-Term Average Outflow Concentration, Compartment A1

  8. Baseline 2015-2056 • Component A2 • Reservoir Area = 20,400 acres • Average Inlet Concentration = 72 ppb • Average Outlet Concentration = 59 ppb Estimated Long-Term Average Outflow Concentration, Compartment A2

  9. Baseline 2015-2056 • Component B • Reservoir Area = 10,240 acres • Average Inlet Concentration = 71 ppb • Average Outlet Concentration = 59 ppb Estimated Long-Term Average Outflow Concentration, Compartment B

  10. STA-3/4 Baseline • Average Annual Inflows • 2007-2014; 660,889 ac-ft at Mean TP Conc. Of 88 ppb • 2015-2056; 628,502 ac-ft at Mean TP Conc. Of 76 ppb • Average Annual Outflows • 2007-2014; 623,700 ac-ft at FW Conc. Of 36 ppb, Geo. Mean Conc. Of 36 ppb • 2015-2056; 588,100 ac-ft at FW Conc. Of 32 ppb, Geo. Mean Conc. Of 30 ppb

  11. Alternative 1 P • Current Design, Present Inflows Through 2014 • STA-3/4 modified to optimize its performance--in place by 2014 • Conversion of Cells 1B, 2B, & downstream Portion of Cell 3 from emergent to Submerged Aquatic Vegetation (SAV_C4) • Future (With CERP) Inflows 2015-2056 Legend: Conversion to SAV New Control Structures New Small Forward New Levee Pumping Station

  12. Alt. 1 Physical Works • 3.3 Miles of Interior Levee Subdividing Cell 3 • Includes Additional Water Control Structures • Also Includes 3.6 Miles Additional Power Line • Forward Pumping Stations (3 total, capacities range from 24 to 54 cfs) • Pump From Emergent Cells During Drought To Maintain Stages in SAV Cells • Herbicide treatment of Cells 1B, 2B, and (new) 3B

  13. Alternative 2 • STA-3/4 modified to optimize its performance--in place by 2006 • Other Than Implementation Schedule, Identical to Alternative 1 • Existing Condition Inflows Through 2014 • Future (With CERP) Inflows 2015-2056

  14. STA-3/4 Summary of Alternatives * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration ** 2015 - 2056

  15. Sensitivity To SAV Performance * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration

  16. Sensitivity To BMP Performance * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration

  17. General Sensitivity * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration

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