UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

Abbreviation for light nonaqueous phase liquid. Liquids falling into this category have specific gravities that are less than water (the specific gravity for water is usually taken to be one), are relatively immiscible with water, and tend to migrate downwards through the vadose and to float on top of the water table. See also LNAPL; immiscible; NAPL.