Impermeable surfaces in cities are increasing due to urban
developments, resulting in decrease storm water infiltration [8].
Green roofs have a water retention capacity that contributes to
control the quantity of runoff water that can go into the city’s sewer
system [7,8,47]. Compared to regular roofing systems, vegetative
roofs drain runoff water at a lower rate allowing the city’s storm
water sewer system to have enough time to transport runoff to the
disposal body of water, which reduces the risk of flooding