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Wetland name or number F S Slope Wetlands Points WATER QUALITY FUNCTIONS - Indicators that the wetland unit functions to - O'u>'t prrb°x) improve water quality S S 1. Does the wetland unit have the potential to improve water quality? (see p.64) S S 1.1 Characteristics of average slope of unit: ::]Slope is % or less (a /%slope has a I fool vertical drop in elevation for every /OQft hori_ontat distance) points = 3 ::]slope is1%-2% points =2 0 ❑Slope is 2%- 5% points = 1 ✓❑Slope is greater than 5% points = 0 S S 1.2 The soil 2 inches below the surface (or duff layer) is clay or organic (use NRCS rnitions) 3 edo ✓ YES = 3 points El NO = 0 points S S 1.3 Characteristics of the vegetation in the wetland that trap sediments and pollutants: Figure R�jh Choose the points appropriate for the description that hey fits the vegetation in the wetland. Dense vegetation means you have trouble seeing the soil surface (>75% cover), and uncut means not grazed or mowed and plants arc higher than 6 inches. ❑ Dense, uncut, herbaceous vcgctation > 90% of the wctland area points = 6 3 Dense, uncut, herbaceous vegetation> 1/2 or area points = 3 ❑ Dense, woody, vegetation >'A of area points = 2 ❑ Dense, uncut, herbaceous vegetation > 1/4 of area points = I ❑ Does not meet any of the criteria above for vcgctation points = 0 Aerial photo or map with vegetation polygons S Total for S 1 Add the points in the bores above l 6 € S S 2. Does the wetland unit have the opportunity to improve water quality? (.see p.67) Answer YES if you know or believe there arc pollutants in groundwater or surface water conning into the wetland that would otherwise reduce water quality in streams, lakes or groundwater downgradient from the wetland. Note which of the following conditions provide the sources ofpollutants. A unit may havepollutants coming from several sources, but any single source would qualify as opportunih . ❑ Grazing in the wetland or within 150ft ❑ Untreated stonnwatcr discharges to wetland ❑ Tillcd fields, logging, or orchards within 150 feet of wetland ❑✓ Residential, urban areas, or golf courses arc within 150 ft upslope of wctland multiplier ❑ Other 2 ❑✓ YES multiplier is 2 ONO multiplier is 1 S TOTAL - Water Quality Functions Multiply the score from S I by S2 12 Add score to table on . 1 Comments Wetland name or number F S Slope Wetlands Points HYDROLOGIC FUNCTIONS - Indicators that the wctland unit functions to Wly r ccom reduce flooding and stream erosion pvrbuxl S 3. Does the wetland unit have the potential to reduce flooding and stream (see p.68) erosion? S S 3.1 Characteristics of vcgctation that reduce the velocity of surface flows during storms. Choose the points appropriate for the description that best fit conditions in the wetland. (.veins ofplants should he thick enough (usually > 118in), or dense enough, to remain erect during surface flows) Dense, uncut, rigid vcgctation covers > 90 % of the area of the wetland. points = 6 3 Dense, uncut, rigid vcgctation > 1/2 area of wctland points = 3 Dense, uncut, rigid vegetation> 1/4 area points= I ❑ More than 1/4 of area is grazed, nnowcd, tilled or vcgctation is not rigid points = 0 S S 3.2 Characteristics of slope wetland that holds back small amounts of flood flows: The slope wctland has small surface depressions that can retain water over at least 10% of its area. ❑YES points = 2 0 ✓ NO points = 0 S Add the points in the hoses above 1 3 see p. 70) S S 4. Does the wetland have the opmortunity to reduce flooding and erosion? Is the wetland in a landscape position where the reduction in water velocity it provides helps protect downstream property and aquatic resources from flooding or excessive and/or erosive flows? Nole which of the following conditions apply. ❑✓ Wetland has surface runoff that drains to a river or stream that has flooding problems ❑ Other multiplier (Answer NO i%the major source of water is conk osled by a reservoir (e.g. wetland is a seep 2 that is on the downstream side of a dam) - ✓ YES multiplier is 2 ONO multiplier is 1 S TOTAL - Hydrologic Functions Multiply the score from S 3 by S 4 Add ,score to table on p. 1 6 Comments Wetland Rating Form —western Washington I I August 2004 Wetland Rating Form —western Washington 12 August 2004 version 2 version 2