Laserfiche WebLink
W etland name or number_ <br /> g Riverine and Freshwater Tidal Fringe Wetlands Points <br /> HYL�O?OGIC FLR�'CTIONS - Indicatoc.,v�at wedand funcaons to reduce �0°h'�"a` <br /> floodin and stream erosion ��� <br /> R 3.Does the wetlaud unit have the noten!ial to reduce flooding and erosion? (see p.54) <br /> R R 3.1 Ch<racteristics of the overbank storage the unit provides: Figure_ <br /> Esrimare the average width ojlhe werland unit perpendicular 10 rhe directian ojthe <br /> Jlaw and:he widrh oJ'rhe stream or river channel(distance benveen bmrksJ. Cciculate <br /> thz ratlo: (werage widrh of wit)/(average wid.•h ojstream benveen banks). <br /> I:ihe ratio is more ihan 20 poinu=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 poinu=2 <br /> Ifthe ntio is<I poin�s= 1 <br /> Aerial hoto or ma showin avera e widths <br /> R R 3.2 Characteristics of vegetation that slow down water velocities during floods: Trzat Figure_ <br /> (arge woody debris ar 'J'orest or shrub". Choose the paints appropria;e for 1he best <br /> description.(polygons nced ro have >90°/,cover et person height NOT Cowardin clazses): i <br /> Forest or shrub for>1/3 area OR herbaceous planu>2/3 area poinu=7 <br /> Forest or s}wb for> 1/10 area OR herba.;eous planu> 1/3 area poinu=4 —_ I <br /> Vegetation dees not meet above criteria poinu=0 y � <br /> Aerial hoto or ma showin aol o�s of drf(eren!v elation es <br /> R .9dc�thc points in(he 6�xes above I � 1 <br /> I � :2 4.Does the wetland unit 6[�ve the onaortunitv to reduce flouding and erocion? (see p.57J <br /> Answer YES if the unit is in �location in the watershed whe�e the flood storage,or <br /> reduction in water veioci,ry,it provides helps protect downstream property ar,d aquatic <br /> resources from flooding or excessive and/or erosive flows.•Note which of rhe foUowing <br /> condi(ions app(y. � <br /> — There aze human structures and activities downstrearn(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 multiplicr <br /> (Answer NO ijthe major source ofwater to rhe wetland is controlled by a reservair or the <br /> wer�Qnd is trda!frrnge along the srdes oja c+rke) I <br /> I YES multiplier is 2 NO multiplier is 1 <br /> R TOTAL -Hydrologic Functions Multinly the score from R 3 by R 4 $ <br /> Add score to table on p. 1 <br /> Cem::e�[s <br /> W'edandRatingFartn-wcscemWashington B August2004 <br /> version 2 <br />