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Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives August.

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Presentation on theme: "Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives Basin-Specific Feasibility Studies, ECP Basins Evaluation of Alternatives August."— Presentation transcript:

1 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

2 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-5, STA-6 Considered Together Due To Interdependent Nature, Shared Tributary Areas Discussed Separately In Report, Combined For Today’s Discussions

3 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins C-139 Basin Bulk Of Runoff Delivered To STA-5 For Treatment Inflows Exceeding Allowable Hydraulic Capacity Diverted To STA-6

4 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-6 Basin Tributary Areas Include: ØUSSC Southern Division Ranch, Unit 1 ØUSSC Southern Division Ranch, Unit 2 (the “C-139 Annex”) ØDiversions of C-139 Basin Runoff From STA-5 During High Discharges

5 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-5 Currently Complete and In Operation Treatment Area of 4,110 Acres In Two Parallel Flow Paths Cell 1B Developed in SAV, All Other Cells Emergent Legend: Existing SAV Existing Spillway Existing Pump Station Existing Control Structure Existing Seepage Pump Station

6 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-6 Cells 5 and 6 Complete and In Operation (Section 1) Cells 2 and 4 Comprise Section 2, Scheduled For Completion In 2006 ØArrangement Shown Varies From Current Design; New Cells Arranged In Series Instead of In Parallel All Considered As Emergent Marsh Legend: Existing SAV Existing Spillway Existing Pump Station Existing Control Structure Existing Seepage Pump Station

7 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Inflows 2007-2014; Existing Conditions (ECP Complete) 2015-2056; 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

8 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Inflows, 2007-2014 STA-5; Ave. Annual Inflow Of 132,113 ac-ft at FW Mean TP Conc. = 178 ppb ØNo Reduction Due to BMPs in C-139 STA-6: Ave. Annual Inflow Of 37,887 ac-ft at FW Mean TP Conc. = 86 ppb Ø50% Reduction Due to BMPs in USSC SDR Unit 2 Total: Ave. Annual Inflow Of 170,000 ac-ft at FW Mean TP Conc. = 157 ppb

9 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins EAA Reservoir Compartment C EAA Reservoir Modeled in 4 Components, 1 Hydraulically Linked to STA-6 Reservoir Inflows Limited to Lake Okeechobee Regulatory Releases All Discharges To STA-6 For Environmental Water Supply Average Annual Inflow 50,033 ac-ft at FW Mean Conc. Of 67 ppb Average Annual Outflows: ØSurface Discharge of 42,243 ac-ft at FW Mean Conc. Of 71 ppb ØSubsurface Discharge of 3,086 ac-ft at Assigned Conc. Of 20 ppb

10 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Inflows, 2015-2056 STA-5; Ave. Annual Inflow Of 147,024 ac-ft at FW Mean TP Conc. = 178 ppb STA-6: Ave. Annual Inflow Of 60,590 ac-ft at FW Mean TP Conc. = 77 ppb Total: Ave. Annual Inflow Of 207,614 ac-ft at FW Mean TP Conc. = 148 ppb

11 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Discharges 2007-2014 ØSTA-5: 125,900 ac-ft/yr At FW Mean Conc.= 45 ppb, Geo. Mean Conc. = 32 ppb ØSTA-6: 35,300 ac-ft/yr At FW Mean Conc. = 28 ppb, Geo. Mean Conc. = 20 ppb ØTotal: 161,200 ac-ft/yr At FW Mean Conc. = 41 ppb

12 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Baseline Discharges 2015-2056 ØSTA-5: 140,800 ac-ft/yr At FW Mean Conc.= 46 ppb, Geo. Mean Conc. = 36 ppb ØSTA-6: 57,600 ac-ft/yr At FW Mean Conc. = 31 ppb, Geo. Mean Conc. = 25 ppb ØTotal: 198,400 ac-ft/yr At FW Mean Conc. = 42 ppb

13 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 1 Considered As Complete in 2014 STA-5: Convert Cell 2B to SAV Legend: Conversion to SAV

14 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 1 Considered As Complete in 2014 STA-6 Modifications ØCell 5 Subdivided, Downstream (New Cell 5B) Converted To SAV Requires New Levee and Control Structures ØCell 4 Converted To SAV Includes 2 Forward Pumping Stations (4 cfs and 11 cfs) For SAV Maintenance, (Can Feed Downstream Cells in STA-5 By Gravity) Legend: Conversion to SAV New Control Structures New Small Forward New Levee Pumping Station P

15 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 2 Identical To Alternative 1, Except Completed By 12/31/06 Instead Of 2014 Predicted Discharges After 2014 Identical to Alternative 1 Would Modify Discharges From 2007-2014

16 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 3 Considered As Complete In 2014 STA-5 Would Be Expanded And Enhanced All C-139 Basin Discharges Directed To STA-5 Legend: Conversion to SAV New Control Structures New Pumping Station New Levee New Gates G Pump

17 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 3 Legend: Conversion to SAV New Control Structures New Pumping Station New Levee New Gates G Pump Expand To Include All Areas East Of L-2 (Adds 730 Acres) Additional Transverse Levee And Control Structures In Each Flow Path Additional Area Converted To SAV (300 Acres in Each Flow Path), Plus Cell 2B Addition Of Gates And Automation At G-343 Structures Requires New Inflow Pumping Stations For C- 139 Basin Requires New Containment Levee West Of L-2

18 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 3 Considered As Complete In 2014 No C-139 Basin Discharges Directed To STA-6 Size Of STA-6 Section 2 Could Be Reduced By Approx. 20% STA-6 Would Be Enhanced Similar To Alts. 1 and 2 Legend: Conversion to SAV New Control Structures New Small Forward New Levee Pumping Station P

19 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 3 Legend: Conversion to SAV New Control Structures New Small Forward New Levee Pumping Station P Overall Area Reduced Approx. 280 Acres (Section 2) Redistributed Inflows, Reducing Cell 3 Inflows From 11% To 6% Of Total ØRequires Replacement Of Existing Inflow Weir With Operable Control Structure Cells 4 and 5B Converted To SAV Forward Pumping Stations For Maintenance Of SAV

20 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Alternative 4 Considers Expanded Use Of EAA Reservoir, Compartment C All C-139 Basin And C-139 Annex Inflows Directed To Reservoir, Added To Lake Okeechobee Regulatory Releases Discharges Distributed To STA-5 And STA-6 Based On Treatment Capacity Includes Enhancement Of STA-5 and STA-6 Alternative Considered Complete In 2014

21 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Physical Works STA-5 Enhancements Similar To Alternative 1 STA-6 Enhancements Similar To Alternative 1, But with New Cell 3 Control Structure Similar To Alternative 3 for flexibility ØSize of Section 2 Not Reduced Need New Pumping Stations For C-139 Basin, Separation Levee West Of L-2 Similar To STA-5, Alternative 3

22 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins EAA Reservoir Compartment C Overall Size Maintained At 12,800 Acres as Presently Modeled Total Daily Discharges At Greater Of: ØStage-Driven Rating Curve, With Discharge Based On Previous Day Stage ØDaily Release For Environmental Water Supply As Reflected In Current SFWMM Simulation Hydrologic Function Of The Reservoir In CERP Maintained, Treated As A Design Requirement Discharge Rating Curve Structured To Satisfy Demands Without ØAllowing Water Surface To Drop Below Ground Elevation ØMaintain Maximum Reservoir Stage At Presently Modeled Value (2.13 m)

23 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins EAA Reservoir Compartment C No Discharges Below 1.0 ft. Depth, Except To Meet Modeled Water Supply For Environment (Treated As Absolute Requirement On Daily Basis) Routing Results: ØMaximum Depth 6.98’ (2.13 m), Unchanged From Current Design ØMean Depth 3.74’ (1.14 m) ØMinimum Depth 0.02’ Average Annual Inflow:: 211,681 ac-ft, FW Mean TP Conc. = 147 ppb Average Annual Outflow: 203,886 ac-ft, FW Mean TP Conc. = 84 ppb

24 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins STA-5, STA-6 Summary of Alternatives * Computed Value Less than Calibration Range, Reported at Lowest Sustainable Concentration ** 2015 - 2056

25 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

26 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

27 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 #USSC Basin BMP 75% included

28 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 #also includes a 25% BMP Reduction of the C-139 Basin

29 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

30 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

31 Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Basin-Specific Feasibility Studies Everglades Construction Project Tributary Basins Sensitivity to Reduced Inflow Pumping Station Capacity STA-5 Alternative 3 - SPF vs 10-yr Pump Design ØHydrologic Frequency Analysis Method by USGS. Pump Size: ØSPF = 2,772 cfs Ø10-yr = 1,540 cfs 10-year Mean Daily Discharges: Øave. annual bypass load = 1,394 ac-ft; flow-weighted mean concentration of 195 ppb ØAdjusted STA-5 Alternative 3 outflow load = 140,506 ac-ft (i.e., 141,900 ac-ft – 1,394 ac-ft); flow-weighted mean concentration 15 ppb ØTotal Outflow flow-weighted mean concentration = 17 ppb (Increase of 2 ppb in Total Outflows Above Alternative 3) Direct capital cost savings = $9,240,000; Total capital cost savings = $14,391,000 (includes design/construction/contingencies)

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