Glossary of Wetland and Watershed Terms

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Acid – pH of water less than 5.5; pH modifier used in the U.S. Fish and Wildlife Service wetland classification system

Acidic – has a pH of less than 7

Acre – a measure of land, 43,560 square feet

Acre-Foot (acre–ft.) – the volume of water needed to cover an acre of land to a depth of one foot; equivalent to 43,560 cubic feet or 325,851 gallons

Adaptation – evolutionary process by which an organism becomes better suited to live in a particular environment; how a species changes over time to better live in a particular environment

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