An Evaluation of Hydrological Simulation of Extensive Green Roof

Green roof application provided sustainable actions to mitigate the impact of urbanization and climate changes. Conventional and green roof simulations were conducted by EPA SWMM software to obtain the rainfall infiltration and flow rates. The study also looks into the effect of roof gradient on the rainfall-runoff. The results show that the runoff of rainfall on the green roof is less than that of the conventional roof and has higher infiltration than the conventional roof. Green roofs use Bermuda grass Manning values, n = 0.41 yielding better results than other grass roofs and conventional roofs in terms of lower flow rate of rainfall-runoff.