This policy brief examines how Barcelona has addressed the climate crisis through the implementation of Sustainable Urban Drainage Systems (SuDS), highlighting their importance in improving urban resilience against floods. With the forecast of an increase in the frequency of heavy rains in the Mediterranean, the City Council has prioritised the naturalisation of the city through strategies such as the Natura 2030 Plan and the Climate Plan 2018-2030, promoting the replication of natural water behaviour to enhance infiltration and environmental quality.