Investigation of the Impact of Improving the Hydrological Quality of Permeable Asphalt Pavement Based on the SWMM

To address the severe urban flooding and the inability of urban road drainage systems to effectively resolve hydrological cycle issues, four types of permeable pavement were designed, combining the advantages of the good infiltration performance and anti-slip performance of permeable asphalt pavement. Based on the SWMM (Storm Water Management Model), road modeling and hydrological quality simulations were conducted, analyzing the surface runoff reduction rate, maximum inlet flow at the convergence node, pollutant reduction rate, and water quality purification of the four different structural permeable asphalt pavements. The results showed that the surface runoff reduction rate of the four pavements ranged from 44% to 100%, the maximum inlet flow reduction rate at the confluence node ranged from 37% to 78%, the reduction rate of the main pipe flow load ranged from 36% to 100%, the reduction rate of the hydraulic load in the pipeline ranged from 25% to 64%, the maximum water storage depth ranged from 90 mm to 177 mm, and the pollutant reduction rate ranged from 28% to 81%. This study provides the optimal combination of permeable asphalt pavements for the selection of urban pavement structures.