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Glossary & Acronyms

AAP Agency Action Plan. An agreement between specific Illinois state agencies that describes how each agency will comply with the regulations established in the Interagency Wetland Policy Act of 1989.

Accretion The gradual build-up of deposited sediments in a wetland.

Adventitious Roots which grow in unusual places, such as wherever the stem of the plant comes in contact with the ground.

Aerenchyma Spongy, specialized plant tissue made of large air-filled intercellular spaces that transport air from the leaves, and stems to the roots.

Anaerobic The condition of oxygen being absent.

Artificial Wetlands (AW) Artificial and Irrigation-induced Wetland. USDA/NRCS classification of wetlands with NFSA exemptions. Wetlands in an area that was formerly non-wetland, but now meets wetland criteria due to human activities, including wetlands created by an irrigation system on an area that was formerly non-wetland.

Buttressed The state of a tree trunk being excessively swollen to the height of the usual high water mark. Typical state of cypress and mangrove trees.

Class Second lowest wetland classification before modifiers are applied.

CW Converted Wetland. USDA/NRCS classification of wetlands subject to FSA restrictions. Wetlands drained, dredged, filled, leveled, or otherwise manipulated for the purpose of, or to have the effect of, making possible the production of an agricultural commodity. These lands must have been W, FW, or FWP and not highly erodible prior to the conversion. They may have been converted by any activity, including the removal of woody vegetation, that impaired or reduced the flow, circulation, or reach of water; provided the conversion activity was such that agricultural production on the land would not have been possible without its application.
Delineation The marking of a boundary on the ground that designates between wetland and non-wetland areas.

Deposition The gradual accumulation of sediments over time.

Determination The classification of a wetland type on a parcel of land.

Discharge Zone An area through which an aquifer releases excess water.

DOD Department of Defense. Parent agency for the USACE.

Emergent Plant species that establishes its roots below normal water level and projects its stems and leaves above normal water level.

Endangered A classification for species in low enough populations that they are likely to become extinct from their natural range.

Extirpated A classification for species that have become locally extinct.

FAA Farmland Assessment Act. State legislation allowing farmland taken out of production to be eligible for tax relief.

FAC Facultative Macrophytic plant species equally likely to occur in wetlands or non-wetlands (estimated probability 34-66 percent).

FACU Facultative Upland. Macrophytic plant species that usually occur in non-wetlands (estimated probability 67-99 percent) but are occasionally found in wetlands (estimated probability 1-33 percent).

FACW Facultative Wetland. Macrophytic Plant species that usually occur in wetlands (estimated probability 67-99 percent) but are occasionally found in non-wetlands.

Floodflow The flow of a stream at peak precipitation.

Wetlands Home Page Page 2 Glossary & Acronyms

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