DC Zoning Regulations 2016

Chapter 5 outlines pervious surface regulations, which are intended to provide a minimum amount of pervious area and limit the amount of impervious surface on a lot. Aligns pervious surface requirements with the development standards for R and RF zones. Pervious surfaces include (a) Grass, mulched groundcover, all areas of a vegetated roof planted with a growing medium, and other planted areas; (b) Permeable or pervious pavers or paving that facilitate the infiltration of water into the soil; and (c) Decks or porches constructed above the surface of the lot that are erected on pier foundations, and that maintain a permeable surface underneath that can facilitate the infiltration of water into the soil. Chapter 6 describes the Green Area Ratio, which sets integrated environmental requirements for landscape elements and site design that contribute to the reduction of stormwater runoff, the improvement of air quality, and the mitigation of the urban heat island effect.