Analysis of Infiltration and Runoff Based on the Volume of Storage Spaces in Storage Permeable Blocks

Recent climate change has led to an increase in total rainfall in spite of a decrease in the number of rainy days. In addition, the increase in impervious surfaces due to urbanization has resulted in greater surface runoff, resulting in urban flooding and flash floods. To address this issue, low-impact development techniques have been introduced to improve water cycle health within watersheds. Permeable pavements, which serve as roadways while reducing impervious surfaces, have been introduced in new towns and development zones. However, most performance evaluations were based solely on the permeability coefficient of the pavement, with limited research on the water cycle performance of the entire permeable pavement system, including the subbase layer. Therefore, this study aims to analyze the effects of the porosity storage volume of joint-type permeable blocks with storage spaces under the same conditions for two types of permeable blocks. The results showed that increasing the porosity storage volume reduced the equilibrium runoff rate by 70%, and increased the runoff time delay by 2 to 2.5 times.