The simplified design method of permeable pavement system for urban catchment

Abstract

Climate change increases the probability of extreme rainfall events, which results in large-scale flooding in urban areas. Yet, urban areas are often too crowded to build flood detention facilities. To cope with this issue, this study developed a simplified design method of a permeable pavement system. Firstly, the detention volume calculation method for the underground detention pond was established. Secondly, a novel permeable pavement system named JW pavement was used as an example to verify the feasibility of the development method for the underground detention pond. Thirdly, the surface infiltration rate and the void ratio of a gravel layer were measured. Finally, the equation of the thickness required for the gravel layer was established based on the requirement of flood detention volume. To sum up, the thicker a gravel layer is, the more capable a gravel layer is to protect the city from flooding. The urban flood can be reduced by the combination of a high surface infiltration rate permeable pavement system and a thick underground detention pond.