7702 RAINIER DR 2022-04-05 - Laserfiche WebLink

Wetland name or numhcr A Wetland name or number A Classification of Wetland Units in Western Washington 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 If the hydrologic criteria listed in each question do not apply to the entire unit being The overbank flooding occurs at least once every two years. rated,you probably have a unit with multiple HGM classes. In this case,identify which NOTE:The riverine unit can contain depressions that are filled with water when the river is hydrologic criteria in questions 1-7 apply,and go to Question 8. not flooding. ONO-go to 6 EYES-The wetland class is Riverine 1.Are the water levels in the entire unit usually controlled by tides(i.e.except during floods)? 6.Is the entire wetland unit in a topographic depression in which water ponds,or is saturated to the ENO-go to 2 EYES-the wetland class is Tidal Fringe surface,at some time during the year. This means that any outlet,if present,is higher than the If yes,is the salinity of the water during periods of annual low flow below 0.5 ppt(parts per interior of the wetland. ENO-go to 7 EYES-The wetland class is Depressional thousand)? Y -Freshwater Tidal Fringe pi—Saltwater Tidal Fringe(Estuarine) Ifyour wetlan can be classified as a Freshwater Tidal Fringe use the forms for Riverine 7.Is the entire wetland unit located in a very flat area with no obvious depression and no overbank wetlands. If it is Saltwater Tidal Fringe it is rated as an Estuarine wetland.Wetlands that flooding. The unit does not pond surface water more than a few inches.The unit seems to be were called estuarine in the first and second editions of the rating system are called Salt maintained by high groundwater in the area. The wetland may be ditched,but has no obvious Water Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were natural outlet categorized separately in the earlier editions,and this separation is being kept in this ENO-go to 8 DYES—The wetland class is Depressional revision. To maintain consistency between editions,the term"Estuarine"wetland is kept. Please note,however,that the characteristics that define Category I and II estuarine 8.Your wetland unit seems to be difficult to classify and probably contains several different HGM wetlands have changed(see p. ). clues. 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 2.The entire wetland unit is flat and precipitation is the only source(>90%)of water to it. IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 Groundwater and surface water runoff are NOT sources of water to the unit. APPLY TO DIFFERENT AREAS IN THE UNIT(make a rough sketch to help you decide). Use ONO-go to 3 EYES-The wetland class is Flats the following table to identify the appropriate class to use for the rating system if you have several If your wetland can be classified as a"Flats"wetland,use the form for Depressional HGM classes present within your wetland. NOTE:Use this table only if the class that is wetlands. recommended in the second column represents 10%or more of the total area of the wetland unit 3. Does the entire wetland unit meet both of the following criteria? being rated. If the area of the class listed in column�2 is less than 10%of the unit:classify the _The vegetated part of the wetland is on the shores of a body of permanent open water wetland using the class that represents more than 90/o of the total area. (without any vegetation on the surface)at least 20 acres(8 ha)in size: HGM Classes within the wetland unit being rated HGM Class to Use in Rating At least 30%of the open water area is deeper than 6.6 ft(2 m)? Slope+Riverine Riverine ✓NO-go to 4 EYES—The wetland class is Lake-fringe(Lacustrine Fringe) Slope+Depressional Depressional 4.Does the entire wetland unit meet all of the following criteria? Slope+Lake-fringe Lake-fringe ✓ The wetland is on a slope(slope can be very gradual), Depressional+Riverine along stream within boundary Depressional —. -The water flows through the wetland in one direction(unidirectional)and usually Depressional+Lake-fringe Depressional comes from seeps. It may flow subsurface,as sheetflow,or in a swale without Salt Water Tidal Fringe and any other class of freshwater Treat as ESTUARINE under distinct banks. wetland wetlands with special ✓ The water leaves the wetland without being impounded? characteristics 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 If you are unable still to determine which of the above criteria apply to your wetland,or if you 3f diameter and less than 1 foot deep). have more than 2 HGM classes within a wetland boundary,classify the wetland as Depressional ❑NO-go to 5 QYES—The wetland class is Slope for the rating. Wetland Rating Form—western Washington 3 August 2004 Wetland Rating Form—western Washington 4 August 2004 version 2 Updated with new WDFW definitions Oct.2008 version 2 Updated with new WDFW definitions Oct.2008