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Categories of Sinkholes

Two processes create three types of sinkholes

Three types of sinkholes are common in Florida: dissolution, cover-subsidence and cover-collapse sinkholes. They develop from dissolution and “suffosion.” Dissolution is the ultimate cause of all sinkholes, but the type of sinkhole is also controlled by the thickness and type of overburden materials and the local hydrology. Although it is convenient to divide sinkholes into three distinct types, sinkholes can be a combination of types or may form in several phases.

Dissolution of the limestone or dolomite is most intensive where the water first contacts the rock surface. Aggressive dissolution also occurs where flow is focussed in the pre-existing openings in the rock, such as along joints, fractures, and bedding planes, and in the zone of water-table fluctuation where ground water is in contact with the atmosphere.

Cover-subsidence sinkholes tend to develop gradually where the covering sediments are permeable and contain sand.

Cover-collapse sinkholes, the most common in Florida, may develop abruptly (over a period of hours) and cause catastrophic damages. They occur where the covering sediments contain a significant amount of clay

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