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Wetland name or number A <br />D <br />its,Wetlalds,u 4 " <br />Po9�tV <br />E m� � <br />��IISfDIi,OI�QGIG�ITNC"�X6`N� rdlcators���f}e"�ge)�a�clwutfunctloflst4 °, <br />t�°�yts�e'� <br />d$ <br />teducellOOd atld stream .:acjatzo <br />(see p.4G) <br />D 3. Does the wetland unit have the potential to reduce flooding and erosion? <br />D <br />D 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 />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 permanent surface outflow and <br />no obvious natural outlet and/or outlet is a man-made ditch points =1 <br />(Ifdttchisnotpernianentlyflowingtreatunitas "intermittently/lowing') <br />QUnit has =constricted, or slightly constricted, surface outlet ermanentl howin oints = 0 <br />D <br />D 3.2 Depth of storage during wet periods <br />Estimate the height ofponding above the bottom of the outlet. For units with no outlet <br />measure firom the surface ofpermanent water or deepestpart (fdry). <br />[]Marks of pending are 3 ft or more above the surface or bottom of outlet points = 7 <br />❑The wetland is a "headwater" wetland" points = 5 <br />❑Marlys of pending between 2 ft to < 3 ft from surface or bottom of outlet points = S <br />❑Marks are at least 0.5 ft to < 2 ft 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 />d❑Marks of pending less than 0.5 ft points = 0 <br />D <br />D 3.3 Contribution of wetland unit to storage in the watershed <br />Estimate the ratio of the area ofupstream basin contributingsutface water to 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 />3 <br />✓ The area of the basin is 10 to 100 threes 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 />retire unit is in the FLATS class points — 5 <br />D <br />Total for D 3 Add the points in the boxes above 1 <br />` 7 l <br />D <br />D 4. Does the wetland unit have the opportunity to reduce flooding and erosion? <br />(seep. 49) <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 of the following indicators of opportunity apply. <br />Wetland is in a headwater of a river or stream that has flooding problems <br />Q Weiland drains to a river or stream that has flooding problems <br />Wetland has no outlet and impounds surface runoff water that might otherwise <br />flow into a river or stream that has flooding problems <br />multiplier <br />❑ Other <br />EYE' 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 />Add score to table on p. T <br />14 <br />Wetland Rating Form— western Washington 6 August2004 <br />version 2 Updated with new WDFW definitions Oct. 2008 <br />