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ABSTRACT
The relative impact of urbanisation (urban sprawl), climate change (rainfall and evapotranspiration) and stormwater disconnection strategies (implementation of green infrastructure (GI)) on a peri-urban stream in the western suburbs of Lyon, France, was investigated using a distributed, physically based model (J2000P). Results showed that ambitious catchment-scale implementation of GI has the potential to mitigate some hydrological effects of urbanisation, especially a drastic reduction of combined sewer overflows. However, GI did not have a large impact on the stream flow regime, especially in the context of climate change, as the stream is dominated by non-urban contributions. Spatially distributed models have the capacity to inform river managers about the extent of implementation of GI needed to achieve given management goals and highlight some limitations of disconnection strategies. Indeed, while GI improved the resilience of sewer networks to global change, it was not sufficient to compensate for the effects of climate change on streamflow.
Acknowledgements
The authors would like to thank the Water Agency Agence de l’Eau Rhône Méditerranée Corse and the Zone Atelier Bassin du Rhône for funding, the Observatoire de Terrain en Hydrologie Urbaine and the Syndicat Intercommunal du Bassin de l’Yzeron for providing support and data. This work was also conducted within the framework of the EUR H2O’Lyon (ANR-17-EURE-0018) of Université de Lyon (UdL), within the program Investissements d’Avenir operated by the French National Research Agency (ANR)
Disclosure statement
No potential conflict of interest was reported by the authors.
Supplemental data
Supplemental data for this article can be accessed https://doi.org/10.1080/1573062X.2023.2217809