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17 Recharge and Flow 2 - sinkholes both can form lakes...

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Sinkhole formation depends on the material overlying the carbonate water-bearing unit Thin, sandy covering Dissolution Sinkholes Thick sands up to 200 ft thick and some clays Subsidence Sinkholes Cohesive clays up to 200ft thick Collapse Sinkholes Miocene clays have been eroded and shaped throughout their history resulting in extreme variability in thickness across the state.
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Sinkhole Types solution Cover Subsidence Cover Collapse Gradual Abrupt Gradual
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Sinkholes, Lakes, Aquifer Recharge
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Sinkholes and 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 Subsidence and collapse
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Unformatted text preview: sinkholes both can form lakes. Subsidence lakes are the most common. Initially the limestone contains fractures, but no subsidence has occurred Small cavities and cracks grow larger as time progresses, and water moving through the rock erodes the rock matrix. Sediments carried by the water fill the voids in the rock. Sediments from the upper layers continue to fill in the openings in the limestone, causing a depression at the land surface. If water collects in the depression, a new lake is formed. Subsidence Lakes (most common) The Importance of Sinkholes and Sinkhole Lakes Hydrologic connections between the surface and the underlying limestone are often maintained....
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