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Wetland name or number <br /> R Riverine and Freshwater Tidal Fringe Wetlands Points <br /> I IYDROLOGIC FUNCTIONS - Indicators that wetland functions to reduce (only l score <br /> per box) <br /> flooding and stream erosion <br /> R 3. Does the wetland unit have the potential to reduce flooding and erosion? (see p.54) <br /> R R 3.1 Characteristics of the overbank storage the unit provides: Figure— <br /> Estimate the average width of the wetland unit perpendicular to the direction of the <br /> flow and the width of the stream or river channel(distance between banks). Calculate <br /> the ratio: (average width of unit)/(average width of stream between banks). <br /> If the ratio is more than 20 points=9 <br /> If the ratio is between 10—20 points=6 <br /> If the ratio is 5- <10 points=4 <br /> If the ratio is 1 -<5 ants <br /> if the ratio is < i points= 1 <br /> Aerial photo or map showing average widths <br /> R 3.2 Characteristics of vegetation that slow down water velocities during floods: Treat Figure <br /> large woody debris as 'forest or shrub". Choose the points appropriate for the best <br /> description.(polygons need to have >90%cover at person height NOT Cowardin classes• <br /> Forest or shrub for>1/3 area OR herbaceous plants>2/3 area inter <br /> Forest or shrub for>1/10 area OR herbaceous plants>1/3 area points= <br /> Vegetation does not meet above criteria points=0 <br /> Aerial photo or map showing polygons of different vegetation types <br /> Add the points in the boxes above G%t <br /> R R 4.Does the wetland unit have the opportunity to reduce flooding and erosion? (see p.57) <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. Note which of the following <br /> conditions apply. <br /> There are human structures and activities downstream(roads,buildings,bridges, <br /> farms)that can be damaged by flooding. <br /> — There are natural resources downstream(e.g.salmon redds)that can be damaged <br /> by flooding <br /> — Other multiplier <br /> (Answer NO if the major source of water to the wetland is controlled by a reservoir or the <br /> wetland is tidal fringe along the sides of a dike) r'? <br /> YES multiplier is 2 NO multiplier is I Y <br /> TOTAL -Hydrologic Functions Multiply the score from R 3 by R 4 t <br /> Add score to table on p. 1 l <br /> S I <br /> Comments <br /> Wetland Rating Form—western Washington 8 August 2004 <br /> version 2 Updated with new WDFW definitions Oct.2008 <br />