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What is the difference between a bioretention basin and a bioretention swale?

April 26, 2017basin bioretention swale

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What is the difference between a bioretention basin and a bioretention swale?

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A bioretention basin has a maximum depth of 12 inches for the stormwater quality design storm. A bioretention swale has a maximum depth of 18 inches, since the slope and the linear nature of the swale will result in low depths of ponding in portions of the basin. However, the average depth of ponding in the basin should be no greater than 12 inches.