Environmental Engineering Reference
In-Depth Information
Other Porous Surfaces
Other proprietary products are now available which are similar to pervious asphalt
and concrete but which utilize clear binders so that the beauty of the natural stone
is visible, allowing an extremely aesthetically pleasing look. Some of these prod-
ucts are not suitable for vehicular traffic, but the material strength varies by
product. The use of clear binder allows the designer the versatility of utilizing
different colored aggregates to suit the application and appearance desired. Typi-
cal applications include tree pits, walkways, plazas, and playgrounds. A number
of products are available on the market, including (but not limited to) Addapave
TP and Flexipave.
Potential Applications
Pervious pavements can be used in residential, commercial, institutional, and
industrial applications in both urban and suburban environments. The use of per-
vious pavements has also been widely applied in retrofit situations when existing
standard pavements are being replaced. Care must be taken when using pervious
pavements in industrial and commercial applications where pavement areas are
used for material storage or the potential for surface clogging is high, due to
pavement usage.
Pervious Pavement Walkways (Concrete and Asphalt)
Pervious pavement, both asphalt and concrete, has also been used in walkways
and sidewalks. These installations typically consist of a shallow (8 in. minimum)
aggregate trench that is sloped to follow the surface slope of the path. In the
case of steeper surface slopes, the aggregate infiltration trench may be “terraced”
into level reaches in order to maximize its infiltration capacity, at the expense of
additional aggregate.
Rooftop and Impervious Area Connections
Pervious pavement systems are often used to provide total site stormwater man-
agement, where rooftops and other impervious surfaces are drained into the
infiltration bed below the pavement surface (Figure 7-13). This can be an effec-
tive means to manage stormwater for a development site while reducing land
disturbance for stormwater BMPs. Proper sediment pretreatment for runoff from
adjacent areas must be considered to prevent clogging of the storage bed. Typical
pretreatment can be achieved by the use of properly maintained inlet sediment
traps and/or water quality inserts (or other filter devices). It is recommended that
direct surface sheet flow conveyance of large impervious areas to the pervious
pavement surface be avoided. High-sheet-flow loading to pervious pavement sur-
faces can lead to premature clogging of the pavement surface. To avoid this, it
is recommended that adjacent impervious areas be drained and conveyed to the
infiltration bed via inlets and/or trench drains with proper sediment pretreatment.
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