Washout of Fine Sand Particles From a Ceramic Tile Roof: Laboratory Experiments Under Simulated Rainfall

Silveira, Alexandre; de Lima, JoãoL. M. P.; Abrantes, JoãoR. C. B.; Mujtaba, Babar

Washout of Fine Sand Particles From a Ceramic Tile Roof: Laboratory Experiments Under Simulated Rainfall

2017

Silveira, Alexandre | de Lima, JoãoL. M. P. | Abrantes, JoãoR. C. B. | Mujtaba, Babar

Roof runoff is an important source of urban stormwater and a main source of rainwater harvesting. Deposition of pollutants on rooftops can have a negative impact on runoff quality and, therefore, on harvested rainwater. Laboratory experiments with simulated rainfall were performed in order to study the washout of fine sand particles deposited on a ceramic tile roof, by runoff, considering the effect of the particle position, particle areal load, particle connectivity and roof slope. Results indicated that particle washout was influenced by the particle position on the roof; particle transport peak and transported mass was higher for the particle mass positions closer to the outlet. Increase in particle areal load decreased particle transport whereas particle connectivity had no effect on particle transport. However, roof slope was a dominant aspect in the particle washout; increase in roof slope greatly increased particle transport peak and transported mass. It also remarkably increased the first flush effect.

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