In Koningsvijver 5, close to Groenendaal station, a plant will be constructed to collect polluted rainwater and treat it via a sand trap and sand filters. Water from the Emperor Charles Pond, located upstream of the Ring Road, will also be directed to this plant via a 170-metre underground pipe.

The works are currently scheduled to finish in 2026, causing only limited disruption to pedestrians, cyclists and motorised traffic. The project is a collaboration between the Agency for Nature and Forests, the Agency for Roads and Traffic, the province of Flemish Brabant and with support from LIFE Belini.