What effect does a “green roof” have on the ability to harvest rainwater?
A “green roof” has plants, trees and grasses planted on the roof to increase the building’s thermal efficiency and to reduce runoff. Obviously, the result is a rainwater harvesting system will need to rely more on harvesting water from other impervious surfaces such as parking lots because the “green roof” will have a lower runoff coefficient than a typical flat, metal or shingle roof. A FreeRain System can be utilized to irrigate a “green roof” during periods of low rainfall to ensure that the plants stay healthy.
