WATERSHED STUDIES

Upper Cedar River/Walsh Lake Basin Technical Study, City of Seattle, (2002-2003)

Taylor Associates, Inc. staff completed a preliminary feasibility study for restoring Walsh Ditch flows to Rock Creek and Taylor Ditch flows to Hotel Creek. Results supported the overall project goal of assessing feasibility of rerouting historical flows from the Walsh Lake basin back to the upper Cedar River upstream of the City of Seattle municipal water intake. This initial study examined the feasibility of restoring flows from two ditched systems to their original watercourses and was intended to identify any potential fatal flaws. Taylor Associates, Inc. was responsible for coordinating a team of hydrology, soil, geology, fisheries, and water quality specialists to complete a four-week technical study of the area. This work included installation and maintenance of flow monitoring network for five stations, coordination of project subconsultants, and completion of an interim project report documenting key findings for the areas of hydrology, water quality, stream habitat, mass wasting, and soils. A second and more detailed phase of this project has begun in 2005. In this second phase, flow monitoring will continue and a water quality monitoring program will begin to further explore the feasibility of restoring flows from the two ditched systems to their original water courses.




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