Originally Posted by CampyTime
Oh my. What causes these? Is it just an underlying weakness in the soil levels or structure?
This is the simplified or 5 cent explanation. Sinkholes generally occur when the bedrock is karst, or limestone. When acid rain filters down through the soul and into the limestone, the acid dissolves and weakens the limestone. When groundwater is pumped excessively and the porous limestone dries out, it crumbles much more easily than wet, saturated limestone. Ultimately, a collapse may occur. Collapse sinkholes like the one in Bowling Green, Kentucky, at the Corvette museum get all the press, but raveling sinkholes are far more prevalent, constituting maybe 90% -95% of all sinkholes. A raveling sinkhole occurs when overlaying soils infiltrate downward over a period of time, generally years, resulting in a noticeable depression on the surface.
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