Permeable asphalt for heavy rain

Important results from the project

With the goal of preventing the effects of heavy rains such as flooding, water pollution and traffic accidents by using permeable asphalt, the project would investigate possibilities and develop a plan for a pilot in Stockholm. The project has developed proposals for locations and approaches for installation and evaluation of a pilot in Stockholm.

Expected long term effects

Permeable asphalt can be laid by machine, but requires new working methods, including increased consideration of weather and time. The initial permeability of permeable asphalt is very high and not limiting for the potential to handle stormwater and torrential rain. Maintenance of the asphalt is important to maintain its long-term function. In order to demonstrate that the solution is cost-effective, more knowledge is needed about maintenance, which techniques work best, and how maintenance should be planned based on site-specific conditions.

Approach and implementation

The project has worked according to pre-set work packages and carried out study visits to the European pilot, lab and production facility as well as evaluated the permeable materials´ processability, work environment, construction time and performance. Calculations regarding permeability linked to literature data have been carried out. Proposals have been drawn up on locations and approaches for installation and evaluation of the pilot in Stockholm.