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Sketches A and D were adapted from Prince George's County, MD, LID IMP Guidance Document, 2002.
Sketches B and C were modified from Start at the Source as provided by Bay Area
Stormwater Management Agencies Association and illustrator Patric Dawe.

Suggestions:

• Use bioretention cells as rain gardens in landscaped parking lot islands to reduce runoff volume and filter pollutants.
• Disconnect the downspouts from roofs and direct the flow to permeable paver areas or other vegetated infiltration / filtration practices.
• Use multi-functional open drainage systems in lieu of more conventional curb-and-gutter systems.
• Use green roofs for runoff reduction, energy savings, improved air quality, and enhanced aesthetics.
• Apply a treatment train approach to provide multiple opportunities for stormwater treatment and reduce the possibility of system failure. The example in sketch D above combines a grassed swale with permeable paver overflow areas and a landscaped bioretention cell.