Compliance: Porous pavement is included as a structural control in the South Carolina DHEC Storm Water Management BMP Handbook. Since water infiltrates rather than pools, black ice does not form and less road salting is needed. Road Safety and Durability: Porous pavement increases skid resistance and traction on wet surfaces while also reducing the spray from passing vehicles and decreasing noise. Infiltrated runoff recharges groundwater supplies, improves flow in streams, and reduces the need for landscaping irrigation. Water Quality: Pollutants are captured during infiltration, reducing pollutant load to local waterways. This reduction in volume results in flood control and reduces the need for traditional stormwater infrastructure (piping, catch basins, stormwater ponds, curbing, etc.). Volume Reduction & Flood Control: Because water flows through porous pavement, the volume of runoff generated during a storm event is significantly decreased or eliminated altogether. There are numerous benefits associated with the use of porous pavement. These systems consist of rigid grids which are then filled with gravel or turfgrass. Other porous surfaces such as grass and gravel pavers are also available depending on the usage of the surface and vehicle loading. Permeable interlocking concrete pavers, while not porous themselves, contain joints filled with small uniformly graded aggregate which allows for the passage of water. This void space is created by removing a large portion of the fine aggregate in the mix design. 
Permeable interlocking concrete pavers (PICP) (Fig.3)īoth porous asphalt and pervious concrete are modified versions of the standard material where void space is created within the material to allow water to percolate through the pavement. 
There are three basic types of porous pavement, which are generally suitable as an alternative to the traditional impermeable surface: This differs from traditional types of pavement, which are impermeable and convert most rainfall to runoff. Porous pavement, or permeable pavement, is an engineered hardscaping surface that allows water to flow through it.
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