Sinkhole Diagram. The term is sometimes used to refer to doline enclosed depressions that are locally also known as vrtače and shakeholes and to openings where surface water enters into underground passages known as ponor swallow hole or swallet. Sinkholes depend on geology some rocks are more soluble than others salt deposits for instance dissolve more quickly.
About 20 or our country is underlain by karst terrain. Sinkhole flooding usually occurs during the same storms that cause rivers to flood so it is sometimes not recognized as karst related. The kentucky department of emergency services estimates that a march 1997 flood cost more than 1 million in.
They can be as small as a car or they.
For north florida there are almost 8 sinkholes per square kilometer over a 427 kilometer area white 1988. Aim to fill at least a quarter of the hole with concrete. About 20 or our country is underlain by karst terrain. One way that sinkholes form is when water rain in the atmosphere reacts with carbon dioxide and forms a weak carbonic acid.