Permeable or perforated paving materials
or pavers with spaces between pavers allow transmission of water to an
aggregate base, reducing runoff volume and improving water quality.
Runoff is temporarily stored in the base and slowly evaporated and
released to storm sewers. Paving blocks and grids, the most common and
available type of permeable pavement, are modular systems containing
openings filled with gravel or rock chips. Porous pavement, concrete,
and asphalt contain larger than typical aggregates and pore space to
allow water percolation, but are less common with greater design
concerns. Variations on gravel are a third type of permeable practice.
Permeable pavement is appropriate for new
and retrofit projects on existing streets, full and temporary (overflow
and special event) parking lots, alleys, sidewalks, utility and access
roads, emergency access lanes, fire lanes, and driveways. Not
appropriate for vehicle service stations, gas stations, and other areas
used for transfer or storage of hazardous materials.
• Reduces stormwater runoff volumes by 20% or more depending on depth of the aggregate base.
• Reduces stormwater runoff rates, by up to 95%.
• Filters sediments, hydrocarbons, nutrients, and other urban pollutants from runoff and reduces runoff temperatures.
• Can help meet detention requirements and reduce stormwater conveyance and detention infrastructure needs (detention storage can be provided within the gravel base below the surface.)
• Reduces need for deicing salt and salt impacts to water quality.
• Less ponding of water on the driving or parking surface reduces skidding, hydroplaning, and ice buildup.
“Permeable interlocking pavement systems are superior pavement solutions, especially in cold-weather climates, and offer multiple benefits as part of an integrated site design.”
Villa Park Police Station Permeable Parking Lot
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