The city says it wants to create more green spaces that can act as sponges, so water gets absorbed into the ground rather than drained into sewers during rain deluges. Firefighters were deployed to help pump water out of buildings. Sabourin said the city typically gets 90 millimetres of rain in July — meaning Montreal received almost as much rain it usually sees in July in the span of two hours. The city's sewers simply don't have the capacity to hold that much water, he said, explaining the floods. The area south of the downtown core was most affected.