![]() Settling and nutrient uptake by plants are the dominant unit processes for stormwater control. Wet swales may be planted with emergent wetland plant species to improve pollutant removal. A wet swale acts as a relatively long and linear shallow biofiltration treatment system, and may be used in tandem with check dams to increase water quality volume retention. Filtration is the dominant unit process for stormwater control.Ī wet swale is a relatively shallow, gently sloping, vegetated conveyance channel that holds water. This type of practice may be used in tandem with check dams and/or impermeable liners. Infiltration is the dominant unit process for stormwater control.ĭry swales with underdrain (biofiltration)Ī dry swale with an underdrain is a relatively shallow, gently sloping, vegetated conveyance channel that has an engineered soil media mix and is designed with an underdrain to prevent standing water due to insufficient native soil infiltration rates. This type of practice may be used in tandem with check dams to increase water quality volume retention. bioinfiltration: a swale designed for infiltration (dry swale or step pool with no underdrain, typically having check dams)ĭry swales with no underdrain (bioinfiltration)Ī dry swale without an underdrain is a relatively shallow, gently sloping, vegetated conveyance channel that prevents standing water via infiltration into in situ soils.biofiltration: a swale designed for filtration (dry swale or step pool with underdrain, or wet swale).vegetated swale: can be used for pretreatment or any of the five variants discussed in this section.vegetated filter or filter strip: pretreatment practices.bioswale: can be used for any of the five variants discussed in this section.regenerative stormwater conveyance: step pool swale.Other names occur in the literature but they can be fit into one of these variants, as described below. This section describes the design variants used in this manual. 2 Specific design applications for various land uses.1.5 Step pools with underdrain (biofiltration).1.4 Step pools with no underdrain (bioinfiltration).1.2 Dry swales with underdrain (biofiltration).1.1 Dry swales with no underdrain (bioinfiltration).The department offices are located at 915 Spring Street, Friday Harbor, WA 98250. San Juan County’s Public Works Department constructs and maintains county roads, designs and constructs storm water facilities, and plans and contracts for solid waste services. Krista Davis, Stormwater Engineering Technician, (360) 370-0533Ībout San Juan County’s Public Works Department New trees will be added along the drainage and trail to replace those removed by the construction. The project will remove seven mid-sized trees (5 crabapple, 1 apple, and 1 red alder) currently growing over a sanitary sewer main and in the path of the new drainage swale. All work is being conducted within the County road right of way and easement. The drainage will be planted with native vegetation, including trees, shrubs, and grasses. In addition to the drainage, the parallel parking along the road will be improved and a gravel trail and bridge crossings will be installed to provide safe pedestrian access to the Farmers Market. The project is funded by a grant from the Department of Ecology and the County’s Clean Water Utility. The Lopez Village Stormwater Improvement Project will upgrade the eroding ditch along the east side of Village Road and improve storm water quality and manage flooding. The Department of Environmental Stewardship and Project Manager Krista Davis would like to thank the Lopez community for their patience and support throughout the planning, design, and construction of the new stormwater channel. The road is currently open to the public. Tree and shrub planting will commence in early spring. In the meantime, a temporary divider will be installed to maintain the integrity of the trail over the wintertime. The new parking area will be chip sealed next year so the gravel walking trail will be more defined. Crews plan to clean up and prepare to leave the project site.Crews will install the vortex weirs and split rail cedar fence.The new bridge has been installed and rock lining has been completed. This new channel is a major improvement for stormwater conveyance and capacity in Lopez Village. The Public Works crew has completed the new stormwater channel which is currently in-use and performing well - especially during recent rains. December 5, 2022– San Juan County Public Works is pleased to provide the public with updates on the Lopez Village Stormwater Improvement Project. ![]()
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