| Recently urban floods frequently occur caused by localized torrential rain. Therefore the Designated Urban River Inundation Prevention Act was enacted in 2003, whereby roadways in designated areas must be equipped with means for controlling rainwater runoff. Permeable pavement is a likely candidate. Thus, the objective of this study is to ensure the applicability of permeable pavement to roadways. The results for test pavement at PWRI showed that the installation of a drainage pipe on the subgrade upper surface or an increase in the base course thickness was effective for retaining pavement durability even in the case of subgrade comprising cohesive soils. In addition, the results of observing test pavement constructed on actual roadways showed that both pavement durability and rainwater runoff control were retained in two or three years after the test pavement sections were opened to traffic. |
