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Old
Redmond Road Bioretention Swale |
In the summer of 2007, the City built improvements to Old Redmond Road
between 132nd Ave NE and 140th Ave NE. Those improvements feature
a planted median.
At the east end of the project, that planted median was configured as a
stormwater bioretention swale. Stormwater from the roadway flows
through the median where pollutants are removed before the water
continues on its way toward Peters Creek and the Sammamish River.
Bioretention systems are stormwater best management practices (BMP’s)
that use filtration to treat stormwater runoff. Bioretention systems are
modeled after the biological and physical characteristics of an upland
terrestrial forest or meadow ecosystem. These systems use vegetation,
such as trees, shrubs, and grasses, to remove pollutants from stormwater
runoff. Sources of runoff are diverted into bioretention systems
directly as overland flow or through a stormwater drainage system.
Alternatively, a bioretention system can be constructed directly in a
drainage channel or swale.
If you look closely, you can see the plants growing in the median!
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