Almost a year ago, Malmö was hit by a very heavy storm event – 100 mm rain fell in six hours, which corresponds with a 200-year storm. This heavy rainfall caused a lot of flooding and damages in many city areas and real estates. The three major insurance companies in Sweden received reporting on damages to the amount of 250 million Swedish Crowns. One city area that was relatively unharmed was Augustenborg, thanks to the sustainable open storm water system that was installed in the beginning of 2000. The storm water is lead through canals, swales, ditches and green areas such as green roofs – Augustenborg’s Botanical Roof Garden has 9500 m2 of green roofs!
The green roof development in Sweden the last years have gone from sedum blanket roofs to biodiverse green roofs which offers more benefits than thin sedum roofs. Malmö has long been the leading city in Sweden when it comes to roof greening and green infrastructure in general. Several of the quite recently installed biotope roofs in Malmö was part of a national VINNOVA-project called BiodiverCity. Cases were developed within the project and the aim has been to increase the city’s biological diversity and to enhance ecosystem services in the urban environment. Seven unique biotope roofs with different habitats – dry meadow, brownfields, shore meadow amongst others - where installed in Malmö.
One of Sweden´s Environmental Objectives is a rich diversity of plant and animal life. Looking at the situation today, this Objective will not be reached to 2020. The reasons why none of the counties in Sweden reaches this objective varies, but exploitation, habitat fragmentation and unsustainable forestry are factors that contribute to a poor diversity of flora and fauna.