Contour - An imaginary line of constant elevation on the ground surface. The 

 corresponding line on a map is called a "contour line." 



Criteria - Standards, rules, or tests on which a judgment or decision may be 

 based. 



Deepwater aquatic habitat - Any open water area that has a mean annual water 

 depth >6.6 ft, lacks soil, and/or is either unvegetated or supports only 

 floating or submersed macrophytes. 



Density - The number of individuals of a species per unit area. 



Detritus - Minute fragments of plant parts found on the soil surface. When 

 fused together by algae or soil particles, this is an indicator that surface 

 water was recently present. 



Diameter at breast height (DBH) - The width of a plant stem as measured at 

 A. 5 ft above the ground surface. 



Dike - A bank (usually earthen) constructed to control or confine water. 



Dominance - As used herein, a descriptor of vegetation that is related to the 

 standing crop of a species in an area, usually measured by height, areal cover, 

 or basal area (for trees) . 



Dominant species - As used herein, a plant species that exerts a controlling 

 influence on or defines the character of a community. 



Drained - A condition in which ground or surface water has been reduced or 

 eliminated from an area by artificial means. 



Drift line - An accumulation of debris along a contour (parallel to the water 

 flow) that represents the height of an inundation event. 



Duration (inundation/soil saturation) - The length of time during which water 

 stands at or above the soil surface (inundation), or during which the soil is 

 saturated. As used herein, duration refers to a period during the growing 

 season. 



Ecological tolerance - The range of environmental conditions in which a plant 

 species can grow. 



Emergent plant - A rooted herbaceous plant species that has parts extending 

 above a water surface. 



Field capacity - The percentage of water remaining in a soil after it has been 

 saturated and after free drainage is negligible. 



Fill material - Any material placed in an area to increase surface elevation. 



AA 



