Making of a Sinkhole
Sinkholes form in karst terrain principally from the collapse of surface sediments into underground voids and cavities in the limestone bedrock. Slightly acidic ground water slowly dissolves cavities and caves in the limestone over a period of many years. When the cavity enlarges to the point that its ceiling can no longer support the weight of overlying sediments, the earth collapses into the cavity.
Karst terrain is a type of topography that is formed by dissolution of bedrock in areas underlain by limestone, dolostone or, as in some western states, gypsum. Such terrain has underground drainage systems that are reflected on the surface as sinkholes, springs, disappearing streams or even caves.
Posted: Friday, May 10, 2013 3:01 am
Updated: 6:07 pm, Wed Aug 21, 2013.
BROOKSVILLE, Fla. (AP) — Hernando County Commissioners are appealing to state and federal legislators for sinkhole relief.
The Tampa Tribune reports (http://bit.ly/16jV26h ) that since 2000, the property appraiser's office has recorded 6,106 sinkhole properties in Hernando County. Of those, 2,726 were repaired and 3,380 were not repaired.
The commission will send a letter to the Federal Emergency Management Agency for financial relief.
Officials say sinkholes are a drain on the local economy, and the outlook for 2013 remains grim.
Sinkhole-labeled homes continue to affect property values. Some officials think that the county must take action by appealing to state and federal legislators and declaring a disaster situation in Hernando County.
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Friday, May 10, 2013 3:01 am.
Updated: 6:07 pm.