C-44 Reservoir and Stormwater Treatment Area

C-44 Reservoir and Stormwater Treatment Area
Name	C-44 Reservoir and Stormwater Treatment Area
Location	Martin County, Florida
Purpose	Water storage, nutrient reduction, ecosystem restoration
Operator	South Florida Water Management District
Part of	Comprehensive Everglades Restoration Plan
Status	Operational

C-44 Reservoir and Stormwater Treatment Area. It is a major component of the Indian River Lagoon-South Florida Water Management District project within the larger Comprehensive Everglades Restoration Plan. This integrated facility is designed to capture and treat agricultural and urban stormwater runoff from the C-44 Canal basin before it discharges into the sensitive St. Lucie River and Indian River Lagoon. Its primary goals are to reduce harmful nutrient loads, particularly phosphorus and nitrogen, and to provide vital water storage to help manage regional hydrology.

Overview

The project is situated in the C-44 (St. Lucie) Canal watershed in Martin County, a region historically affected by Lake Okeechobee discharges and local runoff. It functions as a key Stormwater Treatment Area paired with a substantial reservoir, working in concert to improve the health of the Indian River Lagoon and St. Lucie River estuaries. This infrastructure is a critical part of the state's strategy to address water quality issues and is managed by the South Florida Water Management District in partnership with the United States Army Corps of Engineers.

Design and construction

The design features a 3,400-acre reservoir with a capacity of approximately 16.2 billion gallons and a 6,300-acre Stormwater Treatment Area composed of managed wetlands. Construction, which began in the 2010s, involved significant earthwork to create the levees and berms that contain the system. The project required close collaboration between the South Florida Water Management District and the United States Army Corps of Engineers under the authority of the Water Resources Development Act. Innovative hydraulic structures control the flow of water from the C-44 Canal into the treatment cells and reservoir.

Environmental impact

The facility has a substantial positive environmental impact by reducing the volume and frequency of high-volume freshwater discharges from the C-44 Canal into the St. Lucie River. This helps mitigate the brackish water salinity fluctuations that damage seagrass beds and oyster reefs. By capturing and treating runoff, the project lessens the delivery of nutrients that fuel harmful algal blooms, including cyanobacteria, in the Indian River Lagoon. This supports the recovery of critical habitats for species like the West Indian manatee.

Water quality improvement

The Stormwater Treatment Area utilizes constructed wetlands where aquatic vegetation such as cattails and bulrushes uptake and sequester phosphorus and nitrogen from the water column. This biological process is a proven best management practice for nonpoint source pollution. The system is designed to achieve significant annual reductions in total phosphorus loads before water is either stored in the reservoir for later beneficial use or released under controlled conditions back to the C-44 Canal.

Operational history

The Stormwater Treatment Area cells began phased operations in the late 2010s, with the full reservoir component becoming operational in the early 2020s. Initial operational data collected by the South Florida Water Management District and the Florida Department of Environmental Protection has shown promising reductions in nutrient concentrations. The facility's operations are adjusted in response to rainfall events and in coordination with the larger Central and Southern Florida Project to optimize performance during both wet and dry seasons.

Future plans and challenges

Future plans involve integrating the facility's operations more fully with other Comprehensive Everglades Restoration Plan projects, such as the EAA Reservoir Project, to create a systemic solution for Everglades restoration and coastal protection. Ongoing challenges include managing invasive aquatic plant species within the treatment wetlands, adapting to the impacts of climate change and sea-level rise on regional hydrology, and securing long-term funding for maintenance through state and federal partnerships like the United States Army Corps of Engineers.

Category:Reservoirs in Florida Category:Everglades Category:Water management in Florida