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A typical parking lot design may have 5”– 8” of pervious pavement on top of a 6”–12” subbase of #57 stone (40% voids) on a geotextile fabric.In sandy areas pervious is placed directly above the sand. A: Clogging problems are mainly an issue of design.In practice, fire resistance of structural members used to be evaluated mainly through standard fire tests [8].

Concrete generally provides the best fire resistance properties of any building material [7].

Findings show that the oil is contained within the pervious system as a coating on the large surface area of the void system and at the location of any geotextile fabric separating the pavement from the subbase or subgrade support.

Hydrocarbons, such as oils, are a food source for many naturally occurring bacteria and fungi.

The microorganisms feed on the oil and biodegrade it into simpler chemical components that are released into the atmosphere. Q: What about drainage issues in soils with high clay content?

Research has determined that 97.6 to over 99 percent of oils introduced into pervious pavements are trapped and biodegraded. A: Typically, if a soil type has sufficient percolation to support a septic tank system, it will be suitable for pervious concrete.

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If a soil is truly impervious, the pervious concrete system can still be useful for detention pond requirements.

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