18 Florida Lakes II

18 Florida Lakes II - Florida Lakes Subsidence Sinkhole...

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Unformatted text preview: Florida Lakes Subsidence Sinkhole lakes The most common origin of lake formation in Florida Limestone bedrock is dissolved by acids Land subsidence into dissolved limestone cavities creates depressions filled with water When water in the underlying carbonate aquifer is low, pressure from the overlying water in the lake can breach the clays , providing hydraulic communication with the underlying limestone aquifer. Sediments of the lake bottom are Organic matter mixed with sand and clay transported into the lake by run-off and streams This organic-clayey-sand layer is underlain thinly by Miocene clays Once the outlets are opened, the lake water will adjust to the level of the water table in the limestone unless the sinks again become plugged Variations on a Theme 16,000 to less than 5,000 acres Orange Lake Lake Lochloosa Other Florida Lakes: Features and Types Florida has more natural lakes than any other state in the southeast Florida Lakes are Generally Small Eighty percent of Florida's 8,000 lakes and ponds have a surface area of less than 100 acres (0.16 mi 2 ). Thirty-one Florida lakes are greater than 5,000 acres (3 mi 2 ) in size. Lake Okeechobee, by far the largest lake in Florida, and the 3 rd largest freshwater lake contained wholly within the United States, spans more than 450,000 acres (700 mi 2 ) of open lake Some of the most biologically productive systems in the world Year round growing seasons for large aquatic plants (macrophytes), as well as for microscopic primary producers (algae, phytoplankton) throughout the water column....
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18 Florida Lakes II - Florida Lakes Subsidence Sinkhole...

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