Rooftop Runoff Management

Rooftop runoff management includes the use of cisterns or rain barrels and roof gardens to detain stormwater runoff. Rain barrels and cisterns collect runoff from roofs and store it for household use, such as garden watering. A green roof uses vegetation to soak up and evapotranspire rainfall, much like a bioretention area, before it is discharged. Green roofs require extra engineering to support the weight of the gardens, but can be highly effective in removing pollutants.


Rain Barrel for home use
 


Rooftop Garden (Photo courtesy of Dr. Bill Hunt, NCSU BAE Dept.)

 


From NCDENR Stormwater BMP Manual

Green Roofs section from SC Coastal Low Impact Development Manual

Rainwater Harvesting section from SC Coastal Low Impact Development Manual

Impervious Surface Disconnection section from SC Coastal Low Impact Development Manual

NCSU Rainwater Harvesting Modeling Tool

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