Infiltration basins and bioretention basins are terrestrial-based (up-land as opposed to wetland-based), water quality and water quantity control treatment practices with a required drawdown time of 48 hours or less. For basins within trout stream watersheds, the drawdown time is 24 hours or less due to the need to reduce discharge temperatures.
Differences between infiltration basins and bioretention basins
- Plan drawings for different bioretention devices. Click on an image for enlarged view.
Bioinfiltration device
Biofiltration device with elevated underdrain
Biofiltration device with an underdrain at the bottom
Biofiltration device with internal water storage
Bioretention device with a liner
