Analysis of permeability and recovery rate for unclogging elastic surface filter and G-block for urban rainwater infrastructure regeneration

To economically solve problems for rainwater renovation, stormwater treatment at the early stage is needed for the storage and reuse of safe rainwater. One of the alternatives changes the conventional rainwater drain into an unclogging elastic surface filter (UESF). UESF manufactured with the ethylene propohlene diene monomer (EPDM) has a merit of not only primary treatment of stormwater but also rapid restoration of its permeability by hammering after surface pollutions. Accordingly, in this study, the durability of pavement materials is evaluated by measuring the permeability of UESF and prefabricated prototype called G-block after the removal of surface pollutants. Also, the relationship between coefficient of restitution and recovery rate is estimated. The permeability is measured again after the removal of surface pollutants to calculate the recovery rate. As a result, the permeability of UESF and G-block is much greater than the general permeability standard of 0.01 cm/s. After hammering, the permeability is recovered and the recovery rates of UESF and G-block are 22.22 and 55.6%, respectively. Therefore, it proved that UESF and G-block could improve the permeability and recovery rate for the field application and renovate the conventional rainwater drain for rainwater recycling at urban sites.