Why a polder roof?
A surplus of paved surface creates high pressure on the sewer system in cities during heavy rainfall. Due to climate change, these downpours will become increasingly extreme. The polder roof is the solution for dynamic water storage on roofs. In this way, a huge part of the city can be softened, preventing flooding. Investments will have to be made in the public space (from garden to roof) to make the city rainproof. Rainwater can also be collected and reused.
Rainwater is a resource, not a waste stream.