Jeff and Vicki Pearce are the landowners and applicants for this drainage improvement project on an 84-acre farm, used for pasturing dairy cows, in the Snoqualmie Valley. The King County Agricultural Drainage Assistance Program (ADAP) is assisting the landowners with obtaining the necessary permits.
To address the immediate problem of flooded fields, the proposed project will remove a clogged 12-inch diameter “Y” shaped pipe that is approximately 160 feet long, and replace it with an open channel. A new 30-foot long, 30-inch diameter pipe will be installed to retain access to a field. The project will also remove accumulated sediment and noxious and invasive vegetation that has decreased the capacity of adjacent watercourses and repair a small section of bank that has eroded. If it is necessary, a culvert pipe will be installed under a section of farm field road to reduce the extent of sheet flow when the waterway overflows.
Because of the location of the site at the bottom of the valley wall, it is subject to recurring sediment deposition in large storms. To address the long-term problem, the applicant is considering three alternatives for additional work: installation of a sediment pond, construction of an additional swale, or relocation of the access road into the field to allow more room for sediment deposition.
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