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Wetland name or number E <br />D Depressional and Flats Wetlands Points <br />WATER QUALITY FUNCTIONS - indicators that the wetland taut functions to (Illy t Ion <br />improve water uali trrwxt <br />D D 1. Does the wetland unit have the potential to improve water quality? (see p.38) <br />D 1.1 Characteristics of surface water flows out of the wetland: <br />Figure Rht <br />is a depression with no surface water leaving it (no outlet) points = 3 <br />DUnit <br />�Unit <br />has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 <br />Unit has an unconstricted, or slightly constricted, surface outlet (pennonenlly flowing) points = I <br />Unit is a "flat" depression (Q. 7 on key), or in the Fiats class, with permanent surface outflow and <br />3 <br />no obvious natural outlet and/or outlet is a man-made ditch points = I <br />(!(ditch is rat permanenth;llowing treat tail as "inlermillently,llowing') <br />Provide photo or drawing <br />S 1.2 The soil 2 inches below the surface (or duff layer) is clay or organic (use NRCS . <br />D <br />definitions) <br />4 <br />eYES points = 4 <br />NO points = 0 <br />D <br />1.3 Characteristics of persistent vegetation (emergent, shrub, and/or forest Cowardin class) <br />Figure RMt <br />D <br />Wetland has persistent, ungrazcd, vegetation '> = 95% of area points = 5 <br />PWelland <br />Wetland has persistent, ungrazcd, vegetation > = 112 of area points = 3 <br />Wetland has persistent, ungrazcd vegetation > = 1/10 of area points = I <br />has persistent, ungrazed vegetation <1/10 of area points = 0 <br />Map of Cowardin vegetation classes <br />DI A Characteristics of seasonal ponding or inundation. <br />Figure tO <br />This is the area cif the welland unit that is pnnded, fun• at least 2 months, but dries out <br />D <br />sometime during the,vear. Do not count the area that is pennanently pnnded. Estimate <br />urea ac the average cnnditinn S ran of !0 yrc. <br />4 <br />Area seasonally pnnded is >'✓: total area of wetland points = 4 <br />�✓ Area seasonally pnnded is > 14 total area of wctland points = 2 <br />Area seasonally ponded is <'/4 total area of wetland points = 0 <br />Map ofH dro eriods <br />D <br />Total for D 1 Add the points in the boxes above <br />1 12 I <br />D <br />D 2. Does the wetland unit have the opportunity to improve water qualitN <br />Answer YES if you know or believe there are pollutants in groundwater or surface water <br />coming into the wctland that would otherwise reduce water quality in streams, lakes or <br />groundwater downgradient from the welland. Note which of the,irllowing conditions <br />provide the sources ofliolintants. A unit may have po!littants coming from several <br />sources, but any single source mould qualify as opportuniti. <br />Gruzing in the wetland or within 150 fl <br />✓ Untreated stormwater discharges to welland <br />Tillcd fields or orchards within 150 ft of wetland <br />A stream or culvert discharges into wctland that drains developed areas, residential areas, <br />formed fields, roads, or clear-cut logging <br />Residential, urban areas, golf courses are within 150 fl of wctland <br />multiplier <br />Wetland is fed by groundwater high in phosphorus or nitrogen <br />Other <br />2 <br />=YES multiplier is 2 NO multiplier is 1 <br />D <br />TOTAL- Water Quality Functions Multiply the score from Di by D2 <br />24 <br />Add score to table on t. ! <br />Wetland name or number E <br />D Depressional and Flats Wetlands Points <br />HYDROLOGIC FUNCTIONS - Indicators that the wetland unit functions to i°"ly t'— <br />reduce flooding and stream degradation per bast <br />D 3. Does the wetland unit have the potential to reduce flooding and erosion? (see p.46) <br />D <br />3.1 Characteristics of surface water flows out of the wetland unit <br />✓ Unit is a depression with no surface water leaving it no outlet <br />P 6 ( ) points = 4 <br />Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 <br />4 <br />Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with pcmlancnt surface outflow and <br />no obvious natural outlet and/or outlet is a man-made ditch points = I <br />(/(ditch is not pennarenthvjlowing treat unit as-iniermtnendy.powing'� <br />Unit has an unconstricted, or sli htl constricted, surface outlet (renaa iffl, /lowin >) points=O <br />D <br />D 3.2 Depth of storage during wet periods <br />Estimate the height ofponding above the honour of the outlet. For units with no outlet <br />measure from the surface of permanent water nr deepest part (if or),). <br />arks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 <br />he wetland is a "headwater" wetland" points = 5 <br />5 <br />✓ Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 <br />Marks are at ]cast 0.5 fl to < 2 A from surface or bottom of outlet points = 3 <br />Unit is flat (yes to Q, 2 or Q. 7 on key) but has small depressions on the surface that trap <br />water points = I <br />arks of pending less than 0.5 ft points = 0 <br />D <br />D 3.3 Contribution of wctland unit to storage in the watershed <br />Estimate the ratio of the area of upstream basin contributing stoface water to the wetland <br />to the area of the welland unit itself. <br />The area of the basin is less than 10 times the area of unit points = 5 <br />3 <br />✓ he area of file basin is 10 to 100 times the area of the unit points = 3 <br />he area of the basin is more than 100 times the area of the unit points = 0 <br />Entirc unit is in the FLATS class points = 5 <br />D <br />Total for D 3 Add the points in the boxes above <br />_ _ _ m <br />1 12 1 <br />(see p. 49) <br />D <br />D 4, Does the wetland unit have the opportunity to reduce flooding and erosion? <br />Answer YES if the unit is in a location in the watershed where the flood storage, or <br />reduction in water velocity, it provides helps protect downstream property and aquatic <br />resources from flooding or excessive and/or erosive flows. Answer NO if the water <br />coming into the wetland is controlled by a structure such as flood gate, tide gate, flap <br />valve, reservoir etc. OR you estimate that more than 90% of the water in the wetland is <br />from groundwater in areas where damaging groundwater flooding does not occur. <br />Note which ofthefollowing indicators ofopportunity apply. <br />Welland is in a headwater of a river or stream that has flooding problems <br />Wetland drains to a river or stream that has flooding problems <br />✓Q Weiland has no outlet and impounds surface nutoff water that might otherwise <br />(low into a river or stream that has (loading problems <br />multiplier <br />Other <br />❑✓ YES multiplier is 2 ❑NO multiplier is i <br />2 <br />D <br />TOTAL - Hydrologic Functions Multiply the score from D 3 by D 4 <br />Add score to table on p. 1 <br />24 <br />Wetland Rating Form — westemWashington 5 August 2004 Wetland Rating Form— western Washington 6 August 2004 <br />version 2 version 2 <br />