Wetlands are effective - on average the removal efficiency for nitrogen and phosphorous is 40%.
A widely used method for reducing the input of nutrients into freshwater and marine environments is to allow contributing water to pass through a created or restored wetland. Mistra EviEM has assessed the evidence and concluded that this intervention generally works well. The variation between wetlands is however large, and to obtain significant effects it is important to carefully consider where and how the wetland is constructed.
This film was produced by Johan Hammar Photography for Mistra EviEM and SEI.
Read more about the project:
www.eviem.se/en/projects/wetla...
Photo credit: Johan Hammar