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WRDA > WRDA 2000 Initial Projects > C-9 Stormwater Treatment Area
WRDA 2000 Initial Projects:
C-9 Stormwater Treatment Area / Impoundment
Description – A 2,500-acre stormwater treatment area/impoundment with inflow and outflow structures
Purpose – Enhance groundwater recharge within the basin, provide seepage control for Water Conservation Area 3 and buffer areas to the west thereby keeping more of the natural system’s water in the natural system
Benefits – Improved water quality in coastal basins and Biscayne Bay, improved hydroperiods in the Water Conservation Areas and reduced diversion of urban runoff into Water Conservation Areas
Land Status - 1,515 acres acquired by SFWMD. 985 acres remaining to be acquired
C&SF Restudy Component - "R"
Note: this project is dependent on the implementation of the WCA 3A/3B Levee Seepage Management and the C-11 Impoundment Project
General Description: This project has been sited in the western C-9 Basin in Broward County. The purpose of this project is to capture excess stormwater runoff from the C-11 Basin and Western C-9 Basin in a 2,500 acre Stormwater Treatment Area/Impoundment adjacent to C-9 for storage and water quality treatment. This project is needed to realize the benefits of C-11 Stormwater Treatment Area and Impoundment. . Due to dependencies, this project would be implemented in combination with the C-11 Impoundment project and the Water Conservation Area 3A/3B Seepage Management Project..
Criticality: There are a number of factors supporting initial authorization of this project including: 1) lands were identified as suitable by both the East Coast Buffer Feasibility Analysis and the Water Preserve Areas Land Suitability Analysis; 2) lands are being actively acquired by sponsor; 3) this project is consistent with ongoing programs such as the Water Preserve Areas Feasibility Study and the Everglades Stormwater Program; and 4) acquisition and utilization of lands which are suitable for storage and water quality treatment are rapidly being lost to urbanization; 5) this area is necessary for diversion of C-11 Basin flows prior to the completion of the North Lake Belt Storage Area which is scheduled later in the implementation plan; 6) improved flood protection in the Western C-9 Basin.
Engineering Design: This project includes canals, levees, water control structures and a stormwater treatment area/impoundment with a total capacity of approximately 10,000 acre-feet. The initial design of the stormwater treatment area/impoundment assumed 2,500 acres with the water level fluctuating up to 4 feet above grade. An inflow pump station with a capacity of 1,000 cfs and an outflow gravity structure with a capacity of 1,000 cfs are also envisioned for the impoundment. A seepage collection canal and pump station with a capacity of 200 cfs are needed to prevent impact to private adjacent land. The final size, depth and configuration of these facilities will be determined through the ongoing Water Preserve Areas Feasibility Study.
Operationally, excess stormwater runoff from the C-11 Basin and Western C-9 Basin will be pumped into the C-9 Stormwater Treatment Area/Impoundment for storage and water quality treatment prior to making water supply deliveries to the C-9, or C-6/C-7 Canals. Seepage from C-9 Stormwater Treatment Area/Impoundment will be collected and returned to the impoundment.
Benefits: The benefits from this project will include enhancing groundwater recharge within the basin, provide seepage control for Water Conservation Area 3 and buffer areas to the west thereby keeping more of the natural system’s water in the natural system. In addition flood protection for the western C-9 Basin will be enhanced.
Related Projects: There is an ongoing flood control study underway for this basin. Conclusions from this study will be incorporated into the design of this project. This project is dependent on the implementation of the Water Conservation Area 3A/3B Levee Seepage Management and the C-11 Impoundment Projects.
Schedule: This project is currently scheduled for construction initiation in September 2004 with completion in September 2007. Of the 2,500 acres needed for this project, the SFWMD has acquired 1,515 acres to date. This schedule is based on a very optimistic real estate acquisition plan.
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