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This fact sheet is one of a 15-part series on urban stormwater management practices.
Please refer to definitions in the glossary at the end of this fact sheet. Glossary terms are italicized on first mention in the text. For a comprehensive list, see “Urban Stormwater: Terms and Definitions,” Virginia Cooperative Extension (VCE) publication 426-119.
Rooftop disconnection (RD) is one of the simplest means of reducing stormwater from residential lots. RD takes roof runoff that has been collected in gutters and piped directly to streets, storm drains, and streams and redirects it away from impervious surfaces to landscaped areas (figure 1). Rooftop disconnection is a very sustainable best management practice (BMP) because it controls pollutants in runoff near their source. Redirected runoff from downspouts is infiltrated, filtered, treated, or reused prior to draining into a stormwater conveyance system.
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December 4, 2019