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` 4:2.1 Wetland Functional Summary <br /> .,.,,�-. <br /> . . � <br /> The full text version of the McRAM is provided in Appendix B. The methodology consists of a Iist of <br /> 64 questions which are answered independently. Those questions all measure some unique <br /> characteristic of the wetland. The answers to the questions are typically split into three ratings; High, <br /> , Medium, and Low, however some questions are yes/no and six questions written specifically to the . <br /> determine the predominant natur� of groundwater interaction; recharge or discharge. Each rating is � <br /> assigned a value (i.e. exceptional = 2, higli�= 1,medium = 0.5, and low=0.1). Each wetland <br /> functional rating is computed using formulas developed primarily using the Hydrogeomorphic <br /> Assessment Methodologies along with other relationships developed in other wetland assessment <br /> methodologies (Appendix B). Typically, the highest rating for each function will be a value of 1 <br /> which is equivalent to a High rating, unless some rather unique characteristics or conditions are <br /> present, whereby a the function could be rated Exceptional. The score ranges for the functional <br /> ratings are as follows: <br /> Exceptional= 1.0 -2.0 <br /> High = 0.66— 1.0 � <br /> Medium = 0.33 —0.66 <br /> Low =0.1 -0.33 <br /> The McRAM assesses the following wetland functions and values: <br /> � 4.2.1.1 Maintenance of Characteristic Vegetative Community <br /> The functional rating is based primarily on the diversity of vegetation within the wetland in <br /> comparison to an undisturbed condition for that wetland type. An exceptional rating results from one <br /> of the following conditions: 1) highly diverse wetlands with virtually no non-native species,2) rare <br /> or critically impaired wetland communities in the watershed, or 3) the presence or previous siting of <br /> rare, threatened, or endangered plant species. A high rating indicates the presence of diverse, native <br /> wetland species and a lack of non-native or invasive species. Wetlands that rate ]ow are primarily <br /> dominated by non-native and/or invasive species. <br /> Maximum Score: 2 <br /> 4.2.1.2 Maintenance of Hydrologic Regime <br /> A wetland's hydrologic regime or hydroperiod is the seasonal pattern of the wetland water]evel <br /> which is like a hydrologic signature of each wetland type. It defines the rise and fall of a wetland's <br /> Ufred\wp�3�3TD06\Repor[s�Final Repon\Wetland mgmt�lan dft011503.doc 4-12 <br />