- The result of drilling fluid escaping from a borehole into the formation by way of crevices within the formation . It is a common occurrence in most karst aquifers due to the existence of large subsurface voids that are sometimes intersected during a drilling program.
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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