Glossary of Karst and Cave Terms
Based on "A Lexicon of Cave and Karst Terminology with Special to Environmental Karst Hydrology" EPA/600/R-02/003, 2002, EPA: Washington, DC., Speleogenesis Glossary includes 2699 cave & karst terms
Abbreviation for dense nonaqueous phase liquid. Liquids falling into this category have specific gravities greater 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 phreatic zones in a relatively unimpeded manner. See also LNAPL; immiscible; NAPL.