New Publication! In the latest issue of “Tidskriften VATTEN”, Thomas Larm, Anna Wahlsten and Maria Nordgren from StormTac have together with Johan Kjellin from Tyréns written the publication: “Optimized design of biofilters and swales/ditches for flow detention and treatment” (In Swedish).
 
Current climate changes and urbanization increase the pollutant transport to the recipients as well as the risk of floodings. New stormwater solutions or optimized designs for existing measures are needed to achieve both effective treatment and flow detention. 
 
Studies of biofilters often focus on treatment, but their flow detention ability is rarely studied. This study presents an optimized design of biofilters and swales, which provides both good treatment and flow detention during heavy flows. The height of the drain inlet is adapted to required flow detention and/or treatment, and the drain inlet connects both to the drain sewer and the outlet.
The results showed that the new biofilter design can have similar or even higher capacity for flow detention compared to dry and wet ponds for the same stormwater facility area. The facility-specific parameters with the greatest impact on the required detention volume for biofilter were (in desending order): 1) Height of the well (drain inlet) above the plant bed; 2) Subsoil hydraulic conductivity and 3) Height of the flow detention volume.

Read more in the latest publication of “Tidskriften Vatten nr 1 2024”
Link: Tidskriften Vatten nr 1 2024