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16 Porosity and Sinkholes 6

16 Porosity and Sinkholes 6 - (subsidence sinkholes...

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On May 9, 1981, a large sinkhole collapsed in Winter Park, Florida, swallowing a house, five Porsches at a luxury car dealership, and half of an Olympic-sized swimming pool. The sinkhole collapse occurred when carbonate bedrock had dissolved to the point that it could no longer support the weight of the overlying soil and sediment. The city of Winter Park stabilized and sealed the sinkhole, converting it into a 107-meter-wide (350-foot-wide) urban lake.
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The sinkhole is 120 feet deep and 500 feet across.  Devil’s Millhopper (Cover Collapse) 53 rd  ave. west of 43 rd  St.
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Thin, sandy covering (Solution sinkholes) Thicker sands and some clays
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Unformatted text preview: (subsidence sinkholes) Cohesive clays up to 200ft (Cover Collapse sinkholes) Reported Sinkholes Since 1954 Very thick clays > 200ft. Human Influences Pumping – Removal of water from the underlying carbonate aquifer, lowering hydrostatic pressure. Water pressure tends to support the structural arch Human Influences 10 20 30 40 50 60 70 80 Jan Feb Mar Apr May June July Aug sept Oct Nov Dec Heavy pumping For agriculture Freeze Protection Sinkholes Reported Sinkhole Types solution Cover Subsidence Cover Collapse Cody Scarp...
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