Evaluation of the Impact of Green Roof Implementation on Urban Sewer System Sizing

This article analyzes the impact of implementing green roofs on inaccessible surfaces in the Ecovilla Chal-luabamba urbanization, Cuenca, Ecuador. Using the SWMM software, the conventional sewer system was compared with one that incorporates green roofs, evaluating design storms with return periods ranging from 2 to 50 years. Runoff estimation was performed using models such as the Curve Number, Horton, and Green AMPT, considering variables like climate, substrate type, and slope. The results show that green roofs reduce peak flow by 44.5%, water depth by 6.9%, and velocity by 38.1%, according to the Curve Num-ber model. These findings suggest that green roofs can mitigate flooding by reducing surface runoff and potentially allowing for smaller pipe sizes. This highlights their potential to enhance urban resilience and promote sustainability in urban Development.