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

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA 3/4 Includes S-7/S-2 and S- 8/S-3 Basins Additional Inflows from ØC-139 Basin ØSouth Shore Drainage District ØS-236 Basin ØLake Okeechobee

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins 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

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins 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 ØOnly Phase 1 Authorized by WRDA 2000 ØNot 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

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline 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. ØPreliminary In Nature ØSubject to Review and Possible Substantial Modification During Design of EAA Reservoirs

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline EAA Reservoir Modeled in 4 Components, 3 Hydraulically Linked to STA-3/4 ØA1 - Runoff from NNR & Miami Canal Basins ØA2 - Overflows from A1, & L.O.R.R. ØB - Overflows from A2, and L.O.R.R.

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Component A1 ØReservoir Area = 20,400 acres ØAverage Inlet Concentration = 95 ppb ØAverage Outlet Concentration = 65 ppb Estimated Long-Term Average Outflow Concentration, Compartment A1

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Component A2 ØReservoir Area = 20,400 acres ØAverage Inlet Concentration = 72 ppb ØAverage Outlet Concentration = 59 ppb Estimated Long-Term Average Outflow Concentration, Compartment A2

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Component B ØReservoir Area = 10,240 acres ØAverage Inlet Concentration = 71 ppb ØAverage Outlet Concentration = 59 ppb Estimated Long-Term Average Outflow Concentration, Compartment B

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-3/4 Baseline Average Annual Inflows Ø ; 660,889 ac-ft at Mean TP Conc. Of 88 ppb Ø ; 628,502 ac-ft at Mean TP Conc. Of 76 ppb Average Annual Outflows Ø ; 623,700 ac-ft at FW Conc. Of 36 ppb, Geo. Mean Conc. Of 36 ppb Ø ; 588,100 ac-ft at FW Conc. Of 32 ppb, Geo. Mean Conc. Of 30 ppb

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 1 Current Design, Present Inflows Through 2014 STA-3/4 modified to optimize its performance--in place by 2014 ØConversion of Cells 1B, 2B, & downstream Portion of Cell 3 from emergent to Submerged Aquatic Vegetation (SAV_C4) Future (With CERP) Inflows Legend: Conversion to SAV New Control Structures New Small Forward New Levee Pumping Station P

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alt. 1 Physical Works 3.3 Miles of Interior Levee Subdividing Cell 3 ØIncludes Additional Water Control Structures ØAlso Includes 3.6 Miles Additional Power Line Forward Pumping Stations (3 total, capacities range from 24 to 54 cfs) ØPump From Emergent Cells During Drought To Maintain Stages in SAV Cells Herbicide treatment of Cells 1B, 2B, and (new) 3B

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 2 STA-3/4 modified to optimize its performance--in place by 2006 ØOther Than Implementation Schedule, Identical to Alternative 1 Existing Condition Inflows Through 2014 Future (With CERP) Inflows

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-3/4 Summary of Alternatives * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration **

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Sensitivity To SAV Performance * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Sensitivity To BMP Performance * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration

Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins General Sensitivity * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration