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==Overview==

==Overview==

[[Permeable pavements|Permeable Pavement]] Permeable pavements contain many small openings (i.e., joints or pores) that allow rainfall and snowmelt (i.e., stormwater) to drain through them instead of running off the surface as it does on impervious pavements like conventional asphalt and concrete. An overflow outlet is needed to safely convey flows during flood events. Depending on the permeability of the underlying soil and other constraints, the pavement may be designed with no sub-drain for full infiltration, with a sub-drain for partial infiltration, or with an impermeable liner and sub-drain for a no infiltration practice. The sub-drain pipe may feature a flow restrictor (e.g., orifice cap or valve) for gradually releasing detained water and optimizing the amount drained by [[infiltration]] into the underlying soil.

[[Permeable pavements|Permeable Pavement]] contain many small openings (i.e., joints or pores) that allow rainfall and snowmelt (i.e., stormwater) to drain through them instead of running off the surface as it does on impervious pavements like conventional asphalt and concrete. An overflow outlet is needed to safely convey flows during flood events. Depending on the permeability of the underlying soil and other constraints, the pavement may be designed with no sub-drain for full infiltration, with a sub-drain for partial infiltration, or with an impermeable liner and sub-drain for a no infiltration practice. The sub-drain pipe may feature a flow restrictor (e.g., orifice cap or valve) for gradually releasing detained water and optimizing the amount drained by [[infiltration]] into the underlying soil.

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[[File:P.p plan and profile view.PNG|thumb|400px|General plan and profile (cross-section) views showcasing key components and sections of a Permeable Interlocking Concerte Pavement (PICP).]]

[[File:P.p plan and profile view.PNG|thumb|400px|General plan and profile (cross-section) views showcasing key components and sections of a Permeable Interlocking Concerte Pavement (PICP).]]