Low Impact Development Manual for Michigan - OSEH - University ...

Roads and highways
Figure 7.13 shows a linear bioretention area feature
along a highway. Runoff is conveyed along the concrete
curb (bottom of photo) until it reaches the end of the
gutter, where it spills into the vegetated area.
Figure 7.13
Linear Bioretention Area along Roadway
Source: Low Impact Development Center, Inc.
Parking lot island bioretention
In parking lots for commercial, industrial, institutional,
and other uses, stormwater management and green
space areas are limited. In these situations, bioretention
areas for stormwater management and landscaping may
provide multiple benefits (Figure 7.14).
Figure 7.14
Bioretention area within parking lot
Source: City of Rochester Hills
A bioretention area in a parking lot can occur in parking
lots with no curbs and with curbs. The no-curb alternative
allows stormwater to sheet flow over the parking
lot directly into the bioretention area.
In a curbed parking lot, runoff enters the bioretention
area through a curb cut. If the runoff volume exceeds
the ponding depth available, water overflows the bioretention
area and enters a standard inlet (Figure 7.15).
A variation on this design is a direct underground
connection to the standard inlet from the underground
aggregate infiltration bed via an overflow pipe.
Figure 7.15
Standard inlet to allow for overflow from the
bioretention area
Source: Low Impact Development Center, Inc.
Filter strip planted with special
native seed mix and overlaid with a
synthetic mat.
Bioretention area planted with a
variety of native plants. The trees are
Wildfire Black Gums.”Wildfire” has
the following advantages over regular
seedling-grown black gums: reddish
new growth, consistent fall color, faster
growth, plus better resistance to leaf
spot disease.
LID Manual for Michigan – Chapter 7 Page 138