Due to the excessive amount of paved surfaces in cities, high pressure on the sewage system is inevitable during heavy rainfall. Additionally, climate-change will ensure more rainfall and will cause this pressure to increase. The Polder roof offers a solution to this problem by functioning as dynamic water storage. In this way, a large part of the paved city can be transformed into a green, water absorbent solutions to flooding. In order to create a rainproof city, there will need to be invested in the public space (garden to rooftop). Rainwater can be collected and reused.
Rainwater is a resource, not waste.