Abstract Bioretention systems, such as rain gardens, are landscaped depressions that treat on-site stormwater discharge from impervious surfaces roofs, driveways, sidewalks, parking lots and compacted lawns. They used to collect filter it through a mixture of soil, sand and/or gravel. In this study, pilot-scale bioretention system has been constructed in Universiti Sains Malaysia, Nibong Tebal,...