5900 36TH AVE W SEPA 015 - 034 - SOUNDVIEW BUSINESS CAMPUS - VERITAS Land Use Decision Documents 2025-04-22

Wetland name or number A D Depressional and Flats Wetlands Points HYDROLOGIC FUNCTIONS - Indicators that the wetland unit functions to (only 1 score reduce flooding and stream degradation per box) D 3. Does the wetland unit have the potential to reduce flooding and erosion? (see p.46) D D 3.1 Characteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it (no outlet) points = 4 ✓ Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 2 Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points = 1 Qf ditch is not permanently flowing treat unit as "intermittently flowing ") nUnit has an unconstricted. or sliahtly constricted. surface outlet (permanently flowinZ) points = 0 D D 3.2 Depth of storage during wet periods Estimate the height of ponding above the bottom of the outlet. For units with no outlet measure from the surface of permanent water or deepest part (if dry). ❑Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 ✓❑The wetland is a "headwater" wetland" points = 5 5 ❑Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 ❑Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points = 3 ❑Unit is flat (yes to Q. 2 or Q. 7 on key) but has small depressions on the surface that trap water points = 1 ❑Marks of ponding less than 0.5 ft points = 0 D D 3.3 Contribution of wetland unit to storage in the watershed Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unit itself. The area of the basin is less than 10 times the area of unit points = 5 3 ✓ The area of the basin is 10 to 100 times the area of the unit points = 3 The area of the basin is more than 100 times the area of the unit points = 0 ntire unit is in the FLATS class points = 5 D Total for D 3 Add the points in the boxes above 1 10 1 D D 4. Does the wetland unit have the opportunity to reduce flooding and erosion? (seep. 49) Answer YES if the unit is in a location in the watershed where the flood storage, or reduction in water velocity, it provides helps protect downstream property and aquatic resources from flooding or excessive and/or erosive flows. Answer NO if the water coming into the wetland is controlled by a structure such as flood gate, tide gate, flap valve, reservoir etc. OR you estimate that more than 90% of the water in the wetland is from groundwater in areas where damaging groundwater flooding does not occur. Note which of the following indicators of opportunity apply. ✓❑ Wetland is in a headwater of a river or stream that has flooding problems ❑ Wetland drains to a river or stream that has flooding problems ❑ Wetland has no outlet and impounds surface runoff water that might otherwise flow into a river or stream that has flooding problems multiplier ❑ Other ❑✓ YES multiplier is 2 [:]NO multiplier is 1 2 D TOTAL - Hydrologic Functions Multiply the score from D 3 by D 4 Add score to table on p. 1 20 Wetland Rating Form — western Washington 6 August 2004 version 2 Updated with new WDFW definitions Oct. 2008