Stormwater Management Standards Manual - Toledo Metropolitan ...

Underdrain Gravel
Underdrain gravel should be clean, double-washed #57 stone.
Underdrain
Four inches to six inches rigid schedule 40 PVC. For perforated sections, use 3/8” perforations @ 6
inches o.c., 4 holes per row. Alternately, score pipe with circular pipe with circular saw or use 20-slot
well screen pipe.
Plantings
Bioretention plantings should consist of species that are tolerant of pollution, frequent inundation and are
compatible with the depth and texture of the soil medium. Plantings should occur when the entire
drainage area is stabilized. Native plants are strongly preferred over exotics. Invasive plants should not
be used. Additionally, individual site conditions will make certain species more desirable than others.
Contacting a qualified botanist, landscape architect or native plant dealer may be necessary to
determine suitable plant species.
Plants are available at several native plant dealers throughout Ohio. Contact the Lucas Soil and Water
Conservation District or OSU Extension Service for dealers. Figure 5-15 provides a comprehensive list
of native Ohio plants commonly recommended for bioretention cells.
Suitable Native Plants For Northern Ohio Bioretention Plantings
Type Botanical Name Common Name
F Aquilegia Canadensis Columbine
F Asarum canadense Wild Ginger
F Asclepias incarnate Marsh - Swamp - Red Milkweed
F Aster lateriflorus Side-Flowering Aster
F Aster novai-angliae New England Aster
F Baptisia australis Wild Blue Indigo
F Caltha Marsh Marigold
Third Edition Stormwater Standards Manual September 2008 Page 82