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Estimated money saved: Based on annual cooling and heating degree days in 9 regions of the U.S. according to 2010 National Oceanic & Atmospheric Administration data in the National Climatic Data Center archives, average U.S. retail price for electricity (April 2010), and average U.S. forecasted retail price for natural gas (2010). Actual benefits will vary based on growing media composition/depth, plant coverage/type, building characteristics, and local climate and weather pattern variables.
Estimated stormwater runoff prevented: Based on precipitation averages in 9 regions of the U.S. according to May 2010 - April 2011 National Oceanic & Atmospheric Administration data in the National Climatic Data Center archives, assuming a 60% retention rate. Actual benefits will vary based on growing media depth/moisture content, local climate and weather pattern variables, roof structure, and size/distribution of storm events.
Local and site-specific factors should be considered for more precise calculations of benefits of green rooftop installation.