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That’s the question. Bioretention areas usually include an underdrain; biofiltration seeps into groundwater. Both are useful techniques for stormwater management, and require a very small percentage of the impervious surfaces flowing into them.

Cappiella, Karen; Schueler, Tom; Wright, Tiffany. Center for Watershed Protection

Urban Watershed Forestry Manual. Part 2: Conserving and Planting Trees at Development Sites, 2006

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