The components of permeable paving depend on the type of paving used, but are similar to those of conventional paving. The system normally consists of a wearing layer, a bedding layer, a base, and a sub-base over a sub-grade. A system of unit pavers with aggregate in the voids between pavers provides infiltration of water straight to the bedding layer and sub base. Porous paving allows for water to flow through the pavement itself into the bedding layer.

These two systems can be combined. Grass paving consists of an interlocking layer of plastic cells that provide structural support for vehicular use, while containing planting mix that allows the grass roots to grow.





In situations where the existing sub-base cannot infiltrate the stormwater load, a sub-surface drainage system may need to be installed.

Small pieces of stone, called fines, can block the spaces between the aggregate and affect the water storage capacity of the base layers. For this reason, no-fine aggregates are placed between the pavers and in the bedding layer in permeable paving systems. Geo-textile fabrics can be inserted between layers to keep the fines from migrating through the layers.