Porous Pavement Design Notes
Soils need to have a permeability between 0.5 and 3.0 inches per hour.
The bottom of the stone reservoir should be completely flat so that infiltrated runoff will be able to infiltrate through the entire surface.
Porous pavement should be sited at least 2 to 5 feet above the seasonally high groundwater table, and at least 100 feet away from drinking water wells.
Porous pavement should be sited on low traffic or overflow parking areas, which are not sanded for snow removal.
Notes:
Porous pavement has the same siting considerations as with other infiltration practices (see Infiltration Trenches). The site should meet the above criteria.