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Gently sloped, vegetated ditches that slow the flow of rainwater runoff into the sewer system. The names grassy swale, vegetative filter, vegetative infiltration basin represent different types of bioswales.
When and where to use bioswales:
- Parking lots for absorption of automotive pollutants
- At downspouts to slow and direct rooftop rainwater
- Along any hard impervious surface to slow rainwater
Portland Examples
New Season’s Market on SE Division Street and 20th AVE
OMSI at 1945 SE Water AVE
Other photos and design examples can be seen on the Bureau of Environmental Services Stormwater Manual Appendix G and H. Specific construction drawings and instructions are located in Chapter 2.9.
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