Due to climate change, we are increasingly confronted with extreme precipitation events in which a lot of rain falls in a short period of time. Of course, it is possible to collect rainwater in the ground, for example in retention tanks, infiltration systems, water tanks, overflow sills and rainwater retention basins. However, this is difficult to realise and can also be expensive in densely built-up and urban areas. So why not simply collect the rain where it falls first? On the roof! Green roofs fit in perfectly with the sponge city principle. In the sponge city, urban rainwater can be collected, stored and reused in a sustainable way with the help of a blue-green infrastructure.
