Field Assessment in Permeability and Surface Run-Off of Permeable Pavement

This study was to evaluate the permeable pavement constructed topdown by porous asphalt, compacted natural grading base materials, in-situ soil blended with coarse sand, and geotextile with crushed gravel. The permeable pavement was paved on the field testing site where it was installed a rainfall simulation device to control the intensity of rainfall. The coefficient of permeability and water content for each layer were collected as well as the volumetric water of infiltration and surface run-off. Test results show that the permeability of surface layer was degrading severely after nine years in service, while base and subbase remained functional. While rainfall simulation performed, it indicates that the permeable pavement can retain 0.2139m3 of water with infiltration and surface run-off measured by 0.4665m3 and 0.1413m3, respectively. The analysis of flood peak present that permeable pavement can delay the occurrence of flood peak generated by the surface run-off and ease it quickly by continuous infiltration.