Canal upgrade to improve water flow south of big lake

Posted 2/16/16

LAKE OKEECHOBEE — The South Florida Water Management District (SFWMD) approved a construction contract last week that will increase flexibility to provide flood control and move water in a key …

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Canal upgrade to improve water flow south of big lake

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LAKE OKEECHOBEE — The South Florida Water Management District (SFWMD) approved a construction contract last week that will increase flexibility to provide flood control and move water in a key region that supplies water to farmlands and wetlands that clean Everglades-bound water.

The U.S. Army Corps of Engineers has completed analysis on consequences that would result from a breach in the dike with a lake level at elevation 25 feet (NAVD). Based on this analysis, the Corps has identified seven common inundation zones designed to illustrate areas that could be impacted. Failure of the dike at any location along the lakeside of a common inundation zone would flood the impacted area with at least one foot of water. The U.S. Army Corps of Engineers has completed analysis on consequences that would result from a breach in the dike with a lake level at elevation 25 feet (NAVD). Based on this analysis, the Corps has identified seven common inundation zones designed to illustrate areas that could be impacted. Failure of the dike at any location along the lakeside of a common inundation zone would flood the impacted area with at least one foot of water.


“Expanding our management options is critical to meeting water supply and water quality improvement goals,” said SFWMD Governing Board member Jim Moran.

“This project component will have significant benefits for the environment and the agricultural community, while helping to reduce the potential need for emergency pumping of excess stormwater into Lake Okeechobee.”

The agreement between the SFWMD and landowner A. Duda & Sons calls for a 50/50 split of the $2.2 million cost of constructing a new, two-lane bridge to replace a culvert that limits flow in the Bolles East Canal. The bridge is a crucial component of the SFWMD’s overall project to increase capacity in the canal, which runs east/west in the Everglades Agricultural Area (EAA).

The SFWMD Governing Board approved an investment of $3.8 million to construct Phase 1 of the project in August 2015.

When complete, the canal upgrade south of Lake Okeechobee will improve the flow of water to the newly operational A-1 Flow Equalization Basin and existing Stormwater Treatment Areas (STAs), which use aquatic vegetation to remove excess nutrients in the water before it reaches the Everglades.

The STAs are an integral part of the Governor’s Restoration Strategies plan to improve Everglades water quality. Work that includes expanding the canal bottom width to 40 feet will improve water flow across the EAA. The canal provides a link between the Hillsboro and the North New River canals, serving adjacent agricultural landowners by supplying irrigation and drainage. The canal expansion will also allow more flexibility in water management to balance flows and loads into the STA complexes.

 
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