Police and fire service boats were used to rescue 20 people from across the Todmorden and Hebden Bridge areas.
During the night, when the flooding was at its worst, boats from the fire service and West Yorkshire Police rescued 20 people who were moved to emergency shelters provided by Calderdale Council or to stay locally with family and friends.
The clean-up operation is underway and will be ongoing throughout the rest of the day.
Inspector David Shaw, from West Yorkshire Police, praised the way in which the community came together to help each other during the night.
“The spirit amongst those in the worst affected areas was commendable with local volunteers in 4x4 vehicles and Calder Valley Search and Rescue Team working alongside the emergency services to rescue and move people to safety,” he said.