WEST PALM BEACH, Florida, March 2, 2009 (ENS) – In support of watershed protection plans for Florida’s Caloosahatchee and St. Lucie rivers, the South Florida Water Management District Governing Board has approved a contract with the University of Massachusetts to study changes in nutrient levels in the rivers’ estuaries during the 2009 wet season. June through September are Florida’s wettest months.
Under the $260,000 agreement, university scientists will take measurements at 50 locations in each estuary for benthic fluxes – exchanges of nutrients, such as nitrogen and phosphorus, between sediments and the water column.
The research will help identify where and when the sediments are a source for nitrogen and phosphorus.
The scientists conducted a similar study during the 2008 dry season in drought-like conditions. The combined data from the two studies will yield information critical to defining the role of sediments in the overall nutrient budgets for the Caloosahatchee and St. Lucie estuaries, and will support current and future water quality modeling efforts for these systems, which are part of the larger Northern Everglades water system.
Scientists will be able to identify “hot spots,” or areas of particularly high benthic nutrient flux rates, and optimize future sampling efforts.
The project is managed by the Coastal Ecosystems Division of the SFWMD Watershed Management Department and is part of the Watershed Research and Water Quality Monitoring Plans for the Caloosahatchee and St. Lucie estuaries.
“This project is an important companion to the studies done in 2008,” said Governing Board member Melissa Meeker. “The data collected will ultimately assist in identifying projects needed to achieve water quality enhancements for both estuaries and watersheds.”
The Florida Legislature in 2007 expanded the Lake Okeechobee Protection Act to include protection and restoration of the Lake Okeechobee watershed and the Caloosahatchee and St. Lucie rivers and estuaries.
Subject to ratification by the Legislature, the Caloosahatchee River and St. Lucie River Watershed Protection Plans will be implemented using a phased implementation approach.
Phase 1 will include projects initiated or constructed between 2009 and 2012, followed by Phase 2 including projects initiated between 2013 and 2018. The Long Term Implementation Phase will include projects initiated beyond 2018.
The Caloosahatchee River and Estuary extend about 70 miles from Lake Okeechobee to San Carlos Bay on Florida’s southwest coast. The lower reaches are characterized by a shallow bay, extensive seagrass beds and sand flats. Mangrove forests dominate undeveloped areas of the shoreline. Southwest Florida estuaries provide habitat for more than 40 percent of Florida’s rare, endangered and threatened species.
Benefits of the Caloosahatchee River Watershed Protection Plan include implementation of best management practices on 430,288 acres of agricultural lands and implementation of BMPs on 145,281 acres of urban lands by 2015, and restoration of 2,000 acres of wetlands in the watershed.
Construction of about 35,930 acres of reservoirs and 15,007 acres of stormwater treatment areas and water quality treatment areas is planned to reduce total phosphorus and nitrogen loads to the Caloosahatchee estuary.
There is an intersection of waterways in Martin County, commonly known as the crossroads, where the Indian River Lagoon, the mouth of the St. Lucie River and the St. Lucie Inlet meet. As water is released from Lake Okeechobee into the constructed 152-mile long Okeechobee Waterway, sediment from eroding canal banks and pollutants from stormwater runoff have negative effects on water quality in the St. Lucie River.
The St. Lucie River, part of the Indian River Lagoon estuary system, is inhabited by thousands of plant and animal species, including manatees, dolphins, sea turtles and seahorses.
St. Lucie estuary (Photo courtesy SFWMD)
Benefits of the St. Lucie River Watershed Protection Plan include implementation of BMPs on 297,442 acres of agricultural lands and on 83,861 acres of urban lands and restoration of approximately 95,000 acres of wetlands and natural areas.
Construction of about 11,800 acres of reservoirs and more than 8,500 acres of stormwater treatment areas is planned to reduce phosphorus and nitrogen loads to the St. Lucie estuary.
The plans build upon existing and planned programs and projects, and consolidate previous restoration efforts into a broader approach to restoring the entire Northern Everglades system.
In addition, the Governing Board has approved another year of partnership with the state of Florida, the St. Lucie River Issues Team and federal researchers on a project to track fish health as an indicator of the progress of restoration efforts in the St. Lucie Estuary.
The project is part of a 15-year study by the National Marine Fisheries Service of the National Oceanic and Atmospheric Administration that began in 1996.
“Evaluating fish health as an environmental indicator may provide important insight into the condition of the St. Lucie Estuary and our restoration goals,” said Meeker.
The study is analyzing the potential effects of water quality and environmental stressors, such as freshwater discharges, on the health of fish communities in the St. Lucie Estuary. The results are used to help set performance measures for restoration efforts.
Study results showed a spike in abnormalities of the estuary’s fish populations after the hurricanes of 2004 and 2005, but since mid-2006, abnormalities have decreased.
This year, the study will track the effects of restoration projects, agricultural best management projects and urban and agricultural stormwater retrofit projects on fish health, testing to find out if the abnormalities are environmental in nature.
In 2007, the Florida Legislature expanded the Lake Okeechobee Protection Act to strengthen protection for the Northern Everglades, including the Lake Okeechobee Watershed and the Caloosahatchee and St. Lucie watersheds and estuaries.
The Northern Everglades and Estuaries Protection Program recognizes the importance and connectivity of the entire Everglades ecosystem. Implementation of this program is expected to improve the quality, quantity, timing and distribution of water to the natural system by enhancing land management to reduce nutrient runoff and by constructing local and regional water quality and water storage projects.
Since 2000, the state of Florida has invested more than $3.8 billion to improve the quality and the natural flow of water in the Everglades.













