flooded cars

Less floodings in cities with green roofs

​The amount of rain and extreme rainfall is expected to increase on our northern latitudes because of climate change. This can have major consequences in densely populated areas that run the risk of flooding and have problems with contaminated storm water. But advanced green roofs with microstructure design may be the solution, researchers at Chalmers believe.
“Global climate trends indicate an increase in both extreme and total annual precipitation in the northern latitudes. It will have a major impact on the quality of life in densely populated urban environments in Scandinavia. But at the same time, there is a great need to increase the quality of stormwater that drains into the sea”, says Dario Maggiolo, researcher at the Division of Fluid Dynamics at the Department of Mechanics and Maritime Sciences.

In a scenario where the amount of rainfall is expected to increase drastically, two objectives are very important for the future development of cities and urban environments: firstly, efficient management of the amount of rainwater is required to minimize the risk of flooding and optimized management of water quality.

Green roofs with microstructure design can be the key

Green roofs can play a key role in achieving this two-fold objective by regulating rainfall runoff and the transport of stormwater-borne pollutants according to Dario Maggiolo:

“Advanced green roofs with an optimal microstructural design can be a breakthrough in handling both water quantity and quality in urban environments. In this project, we will combine microscopic numerical calculations and experimental analysis to enable advanced design of green roofs”, he says.

The project has received 3 million SEK from Formas and is a collaboration between the departments of Mechanics and Maritime Sciences as well as Architecture and Civil Engineering​.

Text: Anders Ryttarson Törneholm​

Page manager Published: Wed 04 Dec 2019.