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WRDA > WRDA 2000 Initial Projects > Western C-11
WRDA 2000 Initial Projects:
Western C-11 Impoundment & Diversion Canal
Description – A 1,600 acre stormwater treatment area/impoundment and approximately 8 miles of canal to divert flood waters to other storage areas
Purpose – Manage urban runoff from the western C-11 basin by capturing it in the stormwater treatment area/impoundment. Divert poor quality water from entering Water Conservation Area and treat that water in the C-11 Stormwater Treatment Area/Impoundment where it then becomes available for either the C-9 Stormwater Treatment Area/Impoundment, the North Lake Belt Storage Area after it is operational or Water Conservation Area 3A after treatment
Benefits – Improved water quality in the Water Conservation Area, improved water supply, improved saltwater intrusion protection and additional flows to Biscayne Bay
Land Status - 531 acres acquired by SFWMD. 2004 acres remaining to be acquired
C&SF Restudy Component - "G" (Phase 1)
General Description: This project is sited in western Broward County east of Water Conservation Area 3A and 3B. The diversion canal is located west of US-27 between C-11 and C-9 Canals. The C-11 stormwater treatment area/impoundment is located northeast of the intersection of U.S. Highway 27 and C-11 Canal. The purpose of this project is to divert runoff from the western C-11 Canal Basin that presently backpumped into Water Conservation Area 3A through the S-9 pump station and divert it into the C-11 Stormwater Treatment Area/Impoundment and then into the C-9 Stormwater Treatment Area/Impoundment or Water Conservation Area 3A after treatment depending on conditions. Ultimately, the C-11 flows will be diverted to North Lake Belt Storage Area (once it is operational). Due to dependencies, this project would be implemented in combination with the Water Conservation Area 3A and 3B Levee Seepage Management and the C-9 Impoundment projects.
Criticality: Initial authorization is necessary due to the existing operation of the S-9 pump station and its asociated water quality problems. The original C&SF Project design provides for Western C-11 Basin drainage to be pumped into Water Conservation Area 3. This project will provide the necessary facilities to maintain flood protection within the basin, while reducing flows through the S-9 pump station to Water Conservation Area 3. Other factors supporting initial authorization include: 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 land which is suitable for storage and water quality treatment are rapidly being lost to urbanization.
Engineering Design: This project includes canals, levees, water control structures, and a stormwater treatment area/impoundment with a total storage capacity of 6,400 acre-feet. The initial design of the stormwater treatment area/impoundment assumed 1,600 acres with the water level fluctuating up to 4 feet above grade. The initial design of the diversion canal west of U.S. Highway 27 is for a conveyance capacity of 2,500 cfs. A 2,500 cfs conveyance capacity improvement is envisioned to the C-9 canal between S-30 and the C-9 Impoundment. An intermediate 2,500 cfs pump station in the C-11 canal will be used to direct runoff to the C-11 stormwater treatment area/impoundment. A seepage collection canal and inflow pump station will also be used on the C-11 stormwater treatment area/impoundment. A 2,200 cfs outflow structure is envisioned to discharge from the impoundment to C-11 west of U.S. 27 to the diversion canal. The final size, depth and configuration of these facilities will be determined through the ongoing Water Preserve Areas Feasibility Study.
Benefits: The benefit from this project is that Water Conservation Area 3A water quality will improve when the poor quality runoff from the western C-11 Canal basin is no longer being backpumped into it through the S-9 pump station. This component diverts that water into the C-11 Stormwater Treatment Area/Impoundment where it then becomes available for either the C-9 Stormwater Treatment Area/Impoundment, the North Lake Belt Storage Area after it is operational or Water Conservation Area 3A after treatment.
Related Projects: The C-11 Critical Project is currently underway at this site and is fully compatible with this project. This Critical Project will segregate high quality seepage water and urban runoff, thereby incrementally reducing water quality impacts in the Water Conservation Area 3. This project is dependent on the construction of Water Conservation Area 3 Levee Seepage Management and the C-9 Impoundment projects.
Schedule: The C-11 Impoundment and Canal features are currently scheduled for construction initiation in September 2004 with completion in September 2008. Of the 2,535 acres needed for this project, the SFWMD has acquired 531 acres to date. This schedule is based on a very optimistic real estate acquisition plan.
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