Hydrologic performance of bioretention cells -Preliminary results from a pilot device Performance - Huang, Tinghao; Sage, Jérémie; Techer, Didier; Gromaire, Marie-Christine
A pilot bioretention cell with a deep underground storage layer to enhance exfiltration into the underlying clay soil was set up in Sense-City climatic mini city (France). The pilot system is fully equipped with sensors for inflow, outflow, soil moisture and meteorological monitoring. The study involves the uncertainty evaluations of sensors and a 5-month cumulative water balance analysis (16/06/2022 – 22/11/2022). The preliminary results indicate that during the relatively dry summer period (16/06-25/09), the bioretention cell provided a comparatively high percentage of evapotranspiration (40%) and more limited exfiltration (19%), while later in the wet autumn (25/09-22/11), some evidence might suggest groundwater intrusion into the storage/drainage layer at the bottom. Uncertainty evaluations showed high uncertainties on soil water contain measurements, whose impact on the water balance need to be further analysed.
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