Trails and Paths
In addition to parking lots and roads, porous pavements have also been used successfully for paths and trails. One complication is that paths normally follow the natural contours of the land, so the bed bottoms might not necessarily be flat. They do, however, reduce the amount of impervious surface. They also mimic the natural infiltration of the surrounding terrain and will therefore reduce runoff and improve water quality.
Because the pavement/infiltration system follows the surrounding contours, it is necessary to provide drains at low points as shown in Figure 10.
Porous Asphalt Path
In some cases it may be possible to terrace the bed bottom below the pavement surface with short berms to increase the storage capacity and improve infiltration as shown in Figure 11.
Porous Asphalt Path with Berms for increased storage and infiltration
Note: Above figures are from NAPA's publication Porous Asphalt Pavements for Stormwater Management (order number IS-131). The publication is ideal for contractors, developers, engineers, architects, and parking lot owners. To order, click here .
NAPA's publication HMA Pavements for Trails and Paths (order number IS-129) provides guidelines and recommendations for design and construction. While it does not address porous pavements, it includes much useful information on trails and paths. To order, click here .
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