Via American Society of Landscape Architects
'According to a report from the Sustainable Business Network of Greater Philadelphia, one inch of rainwater hitting one acre of asphalt over an hour yields 27,000 gallons of water.
Green roofs, bioswales, bioretention ponds, and permeable pavements are a few key examples of local green infrastructure, and all work by turning hard asphalt surfaces into green, absorbent ones. For example, Green roofs can retain 40-60 percent of stormwater hitting rooftops."
Watch the video to learn more.