Rooftops are generally poorly used areas and therefore have enormous potential. The Polder roof uses the roof surface to create a water buffer and create a new roof surface for other rooftop functions. The Polder roof then controls the flow of rainwater to the downspout. When it is raining the rainwater runoff is stopped and when the rainwater in the sewage system is processed the Polder roof starts to empty the rainwater buffer, offsetting the peak of rainwater flow into the sewage system.
ProSystem prototype demonstration in operational environment.
Prototype near or at planned operational system. Represents a major step up from TRL 6 by requiring demonstration of an actual system prototype in an operational environment.
We have made one polder roof last year and are planning to build four more in the next month, however there are still some problems to be tackled in production level and on the IT side of the product.

How does it work?

The Polder roof consists of a water buffer created from modules that create a void where rainwater can be stored in. This buffer is locked in by the edge of the roof or dikes creating a basin. The third element is the “Smart Flow Control” which is a control unit that controls the water level height in the water buffer and ensures the safety aspects of the roof with input of several sensors that measure environmental effects on the rooftop.