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�.:'':'� . .-.. ._ ... . _ .-- - <br /> derived from stream base flow and water table characteristics over the � <br /> year(s). <br /> Watershed Company personnel have assessed surfeoe water <br /> characteristics over the last three years. Base winter stream flow is <br /> estimated at 1/2 c.f.s. Flows drop to nothinp or near nothinp depenc::np <br /> upon the summer. Further, the standinp pool of Narbedc Swamp Isaks <br /> throuph the beaver dam at outlet, droppinp the pool ��o to one foot in late <br /> summer. As of this date, the stream is still flowinp with considerable <br /> vofume this year. <br /> Typical bess flow volume is 0.4 pallons per minute over one foot at the <br /> leaky berm. If active flow ceases in the summer, standine water will <br /> remain in the shallow depressions unt?! drawn down by evaporation, <br /> evapotranspiration, vnd infiltration. <br /> We are ^,onfident that adequate hydrology is availablo to create a <br /> successful wetland project, particulariy qiven the nature of the <br /> underlyinp till soils. I <br /> The net effect this will have on the stream will be to sliphtly delay <br /> surface volume in the Fall, dampen the common flow peak sliQhtly by <br /> increasing time of concentration, lessen the total volume of flow sliphtly <br /> due to increased evapotrenspiration, and increase potential biofiltration <br /> of pollutants significantly. <br /> I hope this provides you adequate context for a rather uncommon project! <br /> Please call with questions. <br /> Sirscerely, <br /> i � <br /> i �� <br /> � � L�2�i!z�G�l/ <br /> A. William Wa G2�� <br /> r <br /> President <br /> Attachment <br /> cc. Kirk Brooks - Everett Public Works <br /> Lennie Rae Cooke - Snahomish County Airport <br />