The authors regret that some funding information was missing from the Acknowledgements section in their original paper and apologise for any inconvenience caused. The full Acknowledgements are given below and the online version of the paper has been updated.

Funding received from the European Union Climatic KIC programme with grant number EIT SGA 2018 supporting project ‘Polder Roof Fieldlabs (180522)’. This work has also been partially funded by the Florisa Melone Award, promoted by the Italian Hydrological Society (IHS).

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