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Subsystems and Riverine Systems have four, of which only 3 apply in the Dis�ict). Each Subsystem <br /> is unique for the System to which it applies. <br /> Ll: Limnetic -Extends outward from Littoral boundary and includes deepwater habitats within the <br /> �Lacustrine System. <br /> L2: Littoral -Extends from shoreward boundary to 2 meters (6 feet)below annual low water or to . <br /> the maximum extent of non-persistent emergents, if these grow at greater than 2 meters. <br /> R2: Lower Perennial <br /> R3: Upper Perennial <br /> R4: Intermittent <br /> 4.1.4.3 Class, Subclass <br /> The wetland Class is the highest taxonomic unit below the Subsystem level. The Class code describes <br /> the general appearance of the habitat in terms of either the dominant life form of the vegetation or the <br /> physiography and composition of the substrate. Life forms (e.g. trees, shrubs, emergents) are used to <br /> define classes because they are easily recognizable, do not change distribution rapidly, and have <br /> traditionally been used to classify wetlands. Finer differences in life forms are recognized at the <br /> Subclass ]evel. ' <br /> Mixed classes are used as sparingly as possible, under two main conditions: (1) The wetland contains <br /> two or more distinct cover types each encompassing at least 30 percent areal coverage of the highest <br /> life form, but is too small in size to allow separate delineation of each cover type; and (2)The <br /> wetland contains 2 or more classes or subclasses each comprising at least 30 percent areal coverage <br /> so evenly interspersed that separate delineation is not possible at the scale used for classification. <br /> Mixed subclasses are also allowed and follow the same rules for mixed classes (Cowardin et al., <br /> 1979). <br /> AB: Aquatic Bed - Includes wetlands and deepwater habitats dominated by plants that grow <br /> principally on or below the surface of the water for most of the growing season in most years. <br /> Subclasses include: AB 1 =Algal,AB2=Aquatic Moss, AB3 =Rooted Vascular, AB4=Floating <br /> Vascular, ABS =Unlrnown Submergent, and AB6=Unknown Surface. <br /> \\fred\wp�23�27�D06\Reports�inal Report\Wetland mgmt�lan dit011503.doc 4_7 <br />