Performance and current state of long-term-operating stormwater infiltration systems with bioretention

Abstract

As part of the research program “resource-efficient sewage NRW” (MKULNV) the research project “LEIREV” was carried out to investigate the performance and current state of longtime-operating stormwater infiltration systems with bioretention. The investigation included a comprehensive hydraulic, chemical and operational verification of different bioretention systems with operational times of more than years. The results show deficiencies caused by an insufficiently differentiated planning process. The hydraulic performance continues to conform to the requirements of DWA-A 138. However, the pollutant loading shows a different pattern: increased concentrations of organic and inorganic pollutants in bioretention systems often occur at inflow points or at sites where pre-polluted substrates were not cleared or were installed at the construction process.