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I am sorry to hear this.
I cannot know what by-laws there are and this is something to call by-law enforcement about.
But the law is, and this is from common law, that if someone, even a city, harms you or damages your property they are required to compensate you for the damage and to take steps to ensure this will not happen again.
So the city has to rectify this and if the floods have caused you damage then they have to compensate you and if they will not you can sue them.