Using GreenGrid as a Storm Water BMP
A reduction in impervious surface is not the only advantage that GreenGrid offers when considering its stormwater management advantages over conventional roofing. The modular system, with the presence of vegetation for evapo-transpiration and porous media with available storage, offers a volumetric reduction in total stormwater leaving the roof drains, resulting in lower volumes and flows entering the collection system.
Stormwater performance data is available for all configurations of the GreenGrid system in all depths and all regional media blends. This information provides stormwater capacity in inches of rain per square foot as well as gallons of water per square foot. Custom configurations using additional media types can also be prepared to meet specific project requirements. Please also visit the Green Roof Research page for actual in-field system performance in multiple locations.