green roofs prevent runoff
Photo: Jay Stearns/Photo Design
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Runoff Reduction

The green roof of this unheated porch in the Chesapeake Bay area absorbs 27 percent of the rain that falls on it, reducing storm-water runoff that might pollute nearby rivers and streams. Homeowner Mark Gaulin, a roofer, installed "chicken ladders" to facilitate twice-yearly weeding of the roof, which is planted mostly with sedums, a family of hardy, drought-tolerant perennials.
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