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Wetland name or number B Classification of Wetland Units in Western Washington if the hydrologic criteria listed in each question do not apply to the entire unit being rated, you probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in questions 1-7 apply, and go to Question 8. 1. Arc the water levels in the entire unit usually controlled by tides (i.e. except during floods)? ❑✓ NO - go to 2 DYES - the wctland class is Tidal Fringe If yes, is the salinity of the water daring periods of annual low flow below 0.5 ppt (parts per thousand)? YU - Freshwater Tidal Fringe - Saltwater Tidal Fringe (Estuarine) if your wetlmtt can he classified as a Freshwater trial Fringc use the forms for Riverine wetlands. !fit is Saltwater Tidal Fringe it is rated as an Estuarine wetland Wetlands that were called estuarine in the first and second editions of the rating system are called Salt Water Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and this separation is being kept in this revision. To maintain consistency between editions, the term "Estuarine" wetland is kept. Please note, however, that the characteristics that define Category i and 11 estuarine wetlands have changed (see p. ). 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. WINO - go to 3 ❑ YES - The wetland class is Flats if your wetland can be classified as a "Flats" wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet both of the following criteria? _The vegetated part of the wetland is on the shores of a body of permanent open water (without any vegetation on the surface) at least 20 acres (8 ha) in size; At least 30% of the open water area is deeper than 6.6 ft (2 in)? Q10 - go to 4 ❑ YES - The wetland class is Lake -fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? _The wctland is on a slope (slope can he very gradual), _The water flows through the wctland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a Swale without distinct banks. _The water leaves the wetland without being impounded? NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually < ifi diameter and less than l foot deep). ❑✓ NO - go to 5 ❑YES - The wctland class is Slope Wetland name or number B 5. Does the entire wetland unit meet all of the following criteria? —The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river _ The overbank flooding occurs at least once every two years, NOTE: The riverine unit can contain depressions that are filled with water when the river is not flooding. QNO - go to 6 ❑YES - The wetland class is Riverine 6. Is the entire wctland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year. This means that anv outlet, if present, is higher than the interior of the wetland. ❑NO - go to 7 ❑✓ YES - The wetland class is Depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding. The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. [:]NO -go to 8 DYES -The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM clases. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within your wetland. NOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. if the area of the class listed in coltmin 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM Classes within the wetland unit being rated HGM Class to Use in Ratio Slope + Riverine Riverine Slope + Deressional De ressional Slope + Lake-frina Lake -fringe Depressional + Riverine along stream within boundary Depressional Depressional + Lakc-fringe Depressional Salt Water Tidal Fringe and any other class of freshwater wetland Treat as ESTUARINE under wetlands with special ❑ characteristics If you are unable still to determine which of the above criteria apply to your wetland, or if you have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Wetland Rating Form -western Washington 3 August2004 Wetland Rating Form- western Washington 4 August2004 version 2 version 2