Analysis on Runoff Reduction Effects of Detachable Permeable Block

Heat island effect and urban floods have become more frequent in urban areas. It is widely known that such phenomena are mostly attributed to an increase in impermeable surface such as buildings and road pavements by urbanization. The permeable block pavement is preferred as one solution to manage this problem, but it is reported that their drainage function is rapidly decreased by clogging in most cases. In this study, we developed permeable blocks that consist of top plate, bottom plate and grids with a hollow inside. There are small holes on the top plate that are 4 mm in diameter, which facilitates drainage, and 3 mm-thick grids make their durability better. For performance evaluation, runoff tests in both lab and site test showed that the new permeabl