Stormwater management for “Stadthaus Potsdam”
The city of “Potsdam” wanted to set an example by showing innovative rainwater management techniques for the townhouses that were in process of restoration.
The property was built in the beginning of the 20th century; it had a total area of 20000 m2 from which 6400 m2 of roof area and 6500 m2 of courtyards that needed to be considered.
The existing drainage system is based on a discharge system where rainwater is continuously being mixed with dirt.
Furthermore, underground chambers already exist in the courtyard area and are partially connected to the roof areas.
The main challenge was to properly classify the complex roof system of the property on the basis of aerial imagery as the rainwater management concept needed proper dimensioning taking into account runoff generated from the buildings.
Due to the complexity of the site and the balance between building and outer space areas, the optimal solution of the project necessitated to drain stormwater into underground chambers connected by an overflow throttle to a swale that, in return, will promote excess runoff infiltration into the soil.