Sempergreen Detention & Retention Roof Solutions
This solution was sourced in response to UKGBC’s Innovation Challenge: “How can existing buildings be made more resilient to climate change, with as little disruption to their occupants as possible, by 2030?”
Climate change is causing a rapidly growing number of extreme stormwater events. Flood risks in urban areas are of huge concern and The Sempergreen Detention and Retention Roofs can help with managing the impact of these extreme events.
A Detention Roof was implement for a project in Rotterdam, the Netherlands. During a rain shower R10, 35.7 mm of rain water falls in 45 minutes. The maximum permitted run-off speed on the sewer system is 2.78 litres per second per hectare. When a Detention Roof is applied the calculated peak run-off falls within this standard.