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Rainwater that falls on a rooftop is collected and conveyed into an above- or below-ground storage tank where it can be used for non-potable water uses and on-site stormwater disposal/infiltration.
Vegetated roofs are alternative roof surfaces that typically consist of waterproofing and drainage materials and an engineered growing media that is designed to support plant growth.
This strategy involves managing runoff close to its source by intercepting, infiltrating, filtering, treating or reusing it as it moves from the impervious surface to the drainage system.
Webcast which covers the types of disconnections, runoff reduction and pollutant removal performance, typical design standards and how to set up a disconnection program.
Many designers feel the rules for disconnection are frequently abused and are not very effective for compacted soils.
Green roofs are great at reducing runoff volume, but are not so great at reducing nutrient concentrations, however, is not a major drawback.
Part of the reason for the absence of rain tanks in the Chesapeake Bay watershed is the lack of design specifications for them.
Roof runoff quality is fundamentally determined by the nature of the roof surface, which can be quire diverse.
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