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A bioswale, also called vegetated swale (factsheet,  Cumberland Altalink Corridor Case Study, Kennedale Yard Case Study), is a channel with selected plants and vegetation to slow down, treat, and convey stormwater from roadways, parking lots, and other green spaces. By slowing down the stormwater, the bioswale has the chance to soak up and treat the stormwater, resulting in an enhancement to the water quality before conveying into another facility. 

Bioswales are different from common grass swales. Grass swales usually lack the ability to soak up stormwater. Bioswales have the enhanced soil medium and filter layers similar to the rain gardens.

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