The Beacon Community Centre in Exeter appealed for volunteers to help sweep water away after it was flooded.
Chris Cranston, trustee of the centre, said: “Last night with the torrential rain that came down, we’re unfortunately at the bottom of a hill on the Beacon Heath and there’s a whole load of debris.”
He said leaves in front of the building had blocked the drain in the road so “the water was building up on the road”.
“Although we’ve got some flood prevention doors on the building it’s just got overwhelmed,” he continued.
There have also been dozens of school closures across Devon.
On Tuesday, Devon County Council said 56 schools had been shut or partially closed, including Tipton St John Primary School.
Its future is uncertain as it is in a flood risk area.
The Department for Education has agreed to fund a new building two miles (3km) away in Ottery St Mary, but a petition has called for the school to stay.