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T-3 Bioretention
Photograph B-7. The aggregate layer is covered
with a geotextile and growing media. This photo
shows installation of the geotextile to separate the
growing media from the aggregate layer below.
Cleanouts for the underdrain system are also
shown. Note: The current design section does not
require this geotextile.
Photograph B-8. Shrubs and trees are placed outside
of the ponding area and away from geotextiles.
Photograph B-9. This photo was taken during the first
growing season of this rain garden. Better weed control in the
first two to three years will help the desired vegetation to
become established.
B-22 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3