Response of green roof performance to multiple hydrologic and design variables: a laboratory investigation

Multiple factors affect green roof performance and their effects might vary at different stages of its operation. This paper aimed to link green roof performance to hydrologic (antecedent moisture condition (AMC) and rainfall intensity) and design variables (growing media (GM) type and depth) under multiple dimensions at its early stage of operation using laboratory experiment data. The results showed that the AMC is the most influential factor of the hydrologic performance; whereas the GM type appeared to primarily affect the nutrient levels of outflow. The significant main effects of other variables and interaction effects between two variables imply the challenges in green roof design.