The Lake Okeechobee Fast Track (LOFT) Project

Transcription

1 3 rd UF Water Institute Symposium Sustainable Water Resources The Lake Okeechobee Fast Track (LOFT) Project A Watershed Approach to Phosphorus Removal for a Complex System February 15, 2012 Michael F. Schmidt P.E. BCEE Vice President Larry N. Schwartz Ph.D., PWS Vice President

2 Overview Background Project Goals Site Conditions, Analyses, and Water Budgets Components and Configurations Alternatives

3 Everglades & Lake Okeechobee Restoration LOFT Study Area Quantity Quality Historic Flow Timing Distribution Natural Pulses of Hydrology and Water Quality

4 Project Goals Evaluate and design Project components to achieve maximum practicable total phosphorous removal for the available budget Coordinate proposed Project components and phasing with SFWMD operations of the existing water management system

5 Study Area and Components 360 sq. mi. Surface Water Study Area 6% of watershed 26% of TP Load TCR TCR STA 1,100 sq. mi. Ground Water Study Area NSSTA Components Lakeside Ranch STA Taylor Creek Reservoir Subbasin Re-routing S-133, 154, and/or Kissimmee River LRSTA 191 Lake Okeechobee

6 Water and TP Budget Stations Data Source: DBHYDRO & USGS

7 TP Sources

8 Model Coordination Flowchart

9 Site-Specific Subsurface Conditions

10 Seepage Management

11 STELLA Operations Model Conceptual System Schematic

12 System Operations Model Input

13 Jan-72 Jan-73 Jan-74 Jan-75 Jan-76 Jan-77 Jan-78 Jan-79 Jan-80 Jan-81 Jan-82 Jan-83 Jan-84 Jan-85 Jan-86 Jan-87 Jan-88 Jan-89 Water Depth (ft) Jan-72 Jan-73 Jan-74 Jan-75 Jan-76 Jan-77 Jan-78 Jan-79 Jan-80 Jan-81 Jan-82 Jan-83 Jan-84 Jan-85 Jan-86 Jan-87 Jan-88 Jan-89 Water Depth (ft) Jan-72 Jan-73 Jan-74 Jan-75 Jan-76 Jan-77 Jan-78 Jan-79 Jan-80 Jan-81 Jan-82 Jan-83 Jan-84 Jan-85 Jan-86 Jan-87 Jan-88 Jan-89 Water Depth (ft) Water Budget Results Taylor Creek Reservoir Simulation: Taylor Res Depth MAX Depth MIN Depth Taylor CreekSTA Simulation: Taylor STA Depth MAX Depth Weir Ht Lakeside Ranch STA Simulation: Lakeside Ranch Elev MAX Depth Weir Ht

14 Water and TP Budget Conclusions A reservoir or an equivalent operational shift of 16,000 to 24,000 Ac-ft of storage will capture flows/loads for treatment and keep the STAs hydrated except in cases of extreme drought Amount of water captured is sensitive to reservoir, STA, and water management system operating rules (e.g., S-191) S-191 structure control levels and flow return pumps will provide extreme drought STA hydration and potential additional TP removal during inter-storm event periods Lake O has higher levels of TP near northern inlets S-191 operation and return flow increases WQ benefits for a lower cost

15 Taylor Creek Reservoir

16 Taylor Creek Reservoir Constraints and Issues 1. Capture the greatest volume of water and mass of total phosphorus possible for the available funding 2. Sited on SFWMD land 3. Located and designed with public safety as a primary consideration 4. Design shall consider potential impacts to offsite lands (wells, septic tanks, GW, gas main) and incorporate a seepage management system to control these impacts 5. Consideration of the Okeechobee Airport clear zones is necessary

17 Reservoir Sizing Evaluations NE Intake

18 Lakeside Ranch STA

19 STA Basic Flow Logic Water pumped into STAs whenever they are below design treatment water level Steady and uniform flow to the extent practicable Design levels of 18 inches average (+/- 6 inches) Gates are partially closed (weir raised) when no flow is going into an STA

20 Lakeside Ranch STA Constraints and Issues 1. The STA should work in coordination with Taylor Creek Reservoir-STA and Nubbin Slough STAs to Maximize TP Removal (recirculation could be a major issue) 2. Wetlands and habitat should be incorporated and enhanced if possible 3. Topographic variation must be considered in the design Substantial regrading 4. Consider and manage potential impacts to offsite lands (e.g., building foundations, wells, septic tanks, GW, gas main, fiber optic cable)

21 STA Layout STA-North STA-South Preservation Areas

22 S-133 and 191 Re-Routing

23 Project Components S-191 Pump Station S-191 Subbasin Rerouting S-650 Pump Station Lakeside Ranch STA

24 S-154 Re-Routing

25 Capital Cost Estimates LOFT Project Alternative Capital Cost ($M) Annual TP Removal (Mton/yr) Total TP Removal (Mton) Avg Cost TP Removal ($/lb) 1. TCR Alt 2B, LRSTA Alt 4, S- 133/191, no S , TCR Alt 4, LRSTA Alt 5, S-133/191, with S , TC Reservoir Alt 2B, LRSTA Alt 5, S-133/191, no S , TC Reservoir Alt 2B, LR STA 4, S- 191, no S-133/S LRSTA and S ,

26 LOFT Project Recommendations Taylor Creek Reservoir 1,600 Ac reservoir with 2,000 Ac footprint, 24,000 Ac-Ft volume at 15 ft water depth Benefits may be achieved with operations shift Lakeside Ranch STA 2,000 Ac STA with eight cells 250 cfs pump station

27 LOFT Project Recommendations S-191 Subbasin re-routing with improvements to the L- 63S and L-64 Canals 500 cfs flood control and 110 cfs flow return pump station No S-154 or S-133 Subbasin re-routing Treat with closer STAs Continue with onsite incentives coordinated with FDACS

28 LOFT Project

29 3 rd UF Water Institute Symposium Sustainable Water Resources The Lake Okeechobee Fast Track (LOFT) Project A Watershed Approach to Phosphorus Removal for a Complex System February 15, 2012 Michael F. Schmidt P.E. BCEE Vice President Larry N. Schwartz Ph.D., PWS Vice President