What is 'Permeable paving' and its LEED relevance?

• A. Pervious surfaces allow infiltration, reducing stormwater runoff and supporting groundwater recharge; part of SS
• B. Pervious surfaces increase runoff
• C. Pervious surfaces are only for aesthetics
• D. Pervious surfaces increase parking capacity

Answer: (A)

Permeable paving are surfaces that allow water to pass through them instead of running off the surface. They include options like porous asphalt, pervious concrete, permeable pavers, or grass/soil-based systems with a rock or sand sub-base, often with an underdrain. Water infiltrates through the surface into the sub-base or surrounding soil, which reduces peak stormwater runoff and supports groundwater recharge. In LEED, this approach helps meet Sustainable Sites credits related to rainwater management by lowering the volume and rate of runoff on site, contributing to a more effective on-site stormwater strategy. It’s not about aesthetics or simply increasing parking capacity; it’s a design feature aimed at managing stormwater, though it does require proper design and maintenance to prevent clogging and ensure adequate infiltration.