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*Precast pervious slabs or pavers*a cast in place surface without fines, so that the finish is pervious to water*a bedding course to stabilize the surface
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'''The fundamental components of a permeable paving system are:'''
'''The fundamental components of a permeable paving system are:'''
*interlocking pavers with open joints
* Pavement surface: interlocking pavers with open joints, grid systems, precast pervious slabs or pavers, poured in place asphalt or concrete Bedding layer as a levelling course (for precast systems)
* Subsurface base storage reservoir of open graded aggregate
* Edge restraints
*underground storage layer of aggregate
'''Additional components may include:'''
'''Additional components may include:'''
*an [[underdrain]] system
* an [[underdrain]] system
* geotextile, at the discretion of design professional
* impermeable geomembrane on sites where soil infiltration is not desired
* geo-grids for sites with heavy vehicle loading
* monitoring wells and clean-outs
==Planning considerations==
==Planning considerations==