BioReStorm - Anticipating Biological Succession in Rehabilitation of Long-Term Operated Nature-Based Solutions for Stormwater Treatment in Different Climate Zones (2025–2028)

BioReStorm focuses on the long-term function and development of nature-based solutions (NBS) for stormwater treatment, such as bioretention systems and rain gardens.

Nature-based stormwater systems are increasingly being implemented in urban areas globally to manage flood risks and improve water quality. However, their performance and appearance change over time. Vegetation plays a key role in hydraulic function, stormwater treatment, support of biodiversity, and aesthetics. Harsh environmental conditions (e.g. drought, pollutants, de-icing salts, nutrient deficiency) can lead to the replacement of originally planted species, negatively affecting both functionality and public perception. Maintenance is often neglected, and the systems' appearance may no longer meet residents’ expectations, creating a conflict between regulating ecosystem services and cultural values.

This project therefore aims to:

1. Document how plant communities and associated microorganisms in stormwater NBS change over time and across climate zones.
2. Investigate how these organisms affect hydraulic performance, treatment efficiency, and local biodiversity.
3. Identify shortcomings in design, implementation, and maintenance of NBS.
4. Develop practical rehabilitation and maintenance concepts based on ecological succession.
5. Explore public perception of long-term operated NBS and residents’ willingness to participate in their maintenance, especially when implemented in their own neighbourhood.

The project will assess in mesocosm trials and at field sites the contribution of microbial communities to a successful plant establishment under demanding conitions, involving stakeholders in the development of checklists, simplified in situ tests, and practical rehabilitation measures. Knowledge will also be adapted and transferred to regions with little experience on using SUDS elements. BioReStorm thus contributes to both technical advancement and social acceptance of stormwater solutions, supports the transition to more resilient and sustainable urban planning, and provides valuable insights for decision-makers.

The project is funded by Formas - the Swedish Research Council for Sustainable Development and conducted within the European Biodiversity Partnership Biodiversa+. Partners of the project are ENTPE Lyon (France), University of Lyon, Luleå University of Technology (Sweden), University of Montréal (Canada) and University of Tartu (Estonia).

• Biodiversa+