Permeable pavements

From LID SWM Planning and Design Guide
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Overview

Permeable pavements, an alternative to traditional imperviousA hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil. pavement, allow stormwater to drain through them and into a stone reservoirAn underlying bed filled with aggregate or other void-forming fill material that temporarily stores stormwater before infiltrating into the native soil or being conveyed by an underdrain pipe. where it is infiltrated into the underlying native soilThe natural ground material characteristic of or existing by virtue of geographic origin. or temporarily detained. They can be used for low traffic roads, parking lots, driveways, pedestrian plazas and walkways. Permeable pavementAn alternative practice to traditional impervious pavement, prevents the generation of runoff by allowing precipitation falling on the surface to infiltrate through the surface course into an underlying stone reservoir and, where suitable conditions exist, into the native soil. is ideal for sites with limited space for other surface stormwater BMPs