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Wetland name or number D <br />D Depressional. and Flats Wetlands Points <br />WATER QUALITY FUNCTIONS - indicators that the wetland unit functions to toalp t -1 <br />par boa) <br />improve water quality <br />D D 1. Does the wetland unit have the potential to improve water quality? (see 138) <br />D I.I Characteristics of surface .water flows out of the wetland: <br />Figure W✓sj <br />Unit is a depression with no surface water leaving it (no outlet) points = 3 <br />D <br />✓ Unit has an intenninently flowing, OR highly constricted pcmtarently flowing outlet points = 2 <br />Unit has an unconstricled. or slightly constricted, surface outlet (permanent/1-flowing) points = I <br />Unit is a "Flat" depression (Q. 7 on key), or in the Flats class, with pcmtancnt surface outflow and <br />2 <br />no obvious natural nutlet and/or outlet is a man-made ditch points = I <br />(Ifdirch is not permanenllt.pna•ing treat unit as "inter•n»rtentiv.17o%-ing') <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 />✓ YES points = 4 <br />NOpoints = 0 <br />D <br />1.3 Characteristics of persistent vegetation (emergent, shrub, and/or forest Cowardin class) <br />Figure RMl <br />D <br />Wetland has persistent, ungrazcd, vegetation > = 95 % of area points = 5 <br />Wetland has persistent, ungrazcd, vegetation > = 1/2 of area points = 3 <br />�Wefland <br />Wetland has persistent, ungrazcd vegetation >= 1/10 of area points= I <br />3 <br />has persistent, ungrazed vegetation <I/10 of area points = 0 <br />Map of Cowardin vegetation classes <br />DI A Characteristics of seasonal ponding or inundation. <br />Figure RNA! <br />This is the area of the wetland unit that is ponded fnr at least 2 months, but dries ont <br />D <br />sometime during the year. Do not count the area that is pennanenily ponded Estimate <br />oreaas the average conaW dition 5 of 10yrs. <br />2 <br />seasonally ponded is > %: total area of wetland points = 4 <br />,Area <br />Area seasonally ponded is > A total area of wetiand points = 2 <br />Area seasonally ponded is < y, total area of wetland points = 0 <br />Map of H dro eriods <br />D <br />Total for D I Add the points in the boxes above I <br />D <br />D 2. Does the wetland unit have the opportunity to improve water quality? <br />(see p. 44) <br />Answer YES if you know or believe there are pollutants in groundwater or surface water <br />coming into the wetland that would otherwise reduce water quality in streams, lakes or <br />groundwater downgradient from the wetland. More which of the following conditions <br />provide the sources ofpolhttants. A unit may have pollutanis contingfrom several <br />sources, but any single source would qualify as opportunity. <br />Grazing in the wetland or within 150 ft <br />✓ Untreated slomtwater discharges to wetland <br />Tilled fields or orchards within 150 ft of wetland <br />A stream or culvert discharges into wetland that drains developed areas, residential areas, <br />funned fields, roads• or clear-cut logging <br />Residential, urban areas, golf courses arc within 150 A of wctland <br />multiplier <br />Wetland is fed by groundwater high in phosphorus or nitrogen <br />Other <br />2 <br />✓ YES multi lier is 2 =NO multiplier is 1 <br />D <br />TOTAL -Water Quality Functions Multiply the score from Di by D2 <br />22 <br />Add score to table an r. 1 <br />Wetland name or number D <br />D Depressional and Flats Wetlands Points <br />HYDROLOGIC FUNCTIONS - Indicators that the wetland unit functions to rvaly t .— <br />reduce flooding and stream degradation per ba ) <br />D 3. Does the wetland unit have the notential 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 points = 4 <br />P n g ( ) <br />✓ Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 <br />2 <br />Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with pemtanont surface outflow and <br />no obvious natural outlet and/or outlet is a man-made ditch points = I <br />(ifditrh is not pertnanentlrflowing n•eal sour as "hnernd1rcadv,llowing'� <br />ilnit has an unconsuicted, or slightly constricted, surface outlet >ernmrrendr flowing) points — 0 <br />D <br />D 3.2 Depth of storage during wet periods <br />Estimate the height of ponding above the bottom of the outlet. For units with no ondei <br />rtteasure from the .surface of permmnent water or deepeer part (if dry). <br />Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 <br />[Jrhc wetland is a "headwater' wctland" points = 5 <br />D <br />Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 <br />Marks arc at least 0.5 ft to < 2 it 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 />✓ Marks 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 surface water 10 the wetland <br />to the area of the wetland unit itself <br />The area of the basin is less than 10 times the area of unit points = 5 <br />0 <br />The area of the basin is 10 to 100 times the area of the unit points = 3 <br />✓ The area of the basin is more than 100 times the area of the unit points = 0 <br />Entire unit is in the FLATS class points = 5 <br />D <br />Total for D 3 Add the points in the boxes above <br />1 2 1 <br />(.see p. 79 <br />D <br />D 4. Does the wetland unit have the oanortunity 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 wctland 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 of thefiallowing indicators of opportunity 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 />❑ Wetland has no outlet and impounds surface runof wwater that might otherwise <br />now into a river or stream that has hooding problems <br />multiplier <br />❑ Other <br />EYES multiplier is 2 ❑NO multiplier is 1 <br />2 <br />D <br />TOTAL - Hydrologic Functions Multiply the score from D 3 by D 4 <br />7 <br />Add score to table on p. I <br />4 <br />Wetland Rating Forrn—western Washington 5 August 2004 Wetland Rating Form —western Washington G August 2004 <br />version 2 version 2 <br />