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Delridge Natural Drainage Solutions

Combined sewer overflows cause water quality problems in Longfellow Creek. We helped fix this problem by designing green stormwater infrastructure (GSI) retrofits for thirteen blocks of right-of-way to improve water quality and reduce stormwater volumes discharging to the creek. Bioretention facilities, intersection bioretention bulb-outs, and permeable pavement sidewalks integrate with sidewalk and ramp reconfigurations to achieve these improvements and ADA compliance. Underdrains collect and convey treated stormwater from the planters to a simplified injection well (drilled drain) for deep infiltration. We designed the project in partnership with a neighborhood greenway project in the Delridge neighborhood. Together, the projects enhance pedestrian mobility, increase traffic safety and improve water quality.

Location
Seattle, WA
Owner
City of Seattle - Public Utilities Department
Project Contact
Alice Lancaster, PE
Services
Stormwater Design
Project Type
Civil Engineering

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Our Offices

Seattle, WA

2200 Sixth Avenue
Suite 1100
Seattle, WA 98121
Phone (206) 441-9080
Contact: Alice Lancaster

Portland, OR

107 SE Washington Street
Suite 140
Portland, OR 97214
Phone (503) 228-4301
Contact: Ellen McClure

Missoula, MT

101 East Broadway
Suite 610
Missoula, MT 59802
Phone (406) 998-6760
Contact: Heidi Houck

Bellingham, WA

1329 North State Street
Suite 200
Bellingham, WA 98225
Phone (360) 398-5075
Contact: Chris Webb

Casper, WY

444 S. Center St.
Casper, WY 82601
Phone (206) 787-8219
Contact: Tyson Wright

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