A. Master plumber Rex Cauldwell responds: First of all, be sure that the local water department and building authorities are aware of the problem and see if they can propose a solution.
If the local municipality is unable to help, you have two choices. In either case, you’ll need to cut open the floor slab. If all you want to do is stop stormwater (or worse) from coming into the basement via the floor drain, you can install a backwater valve in the drain line. Backwater valves are available for about $40 to $60 from Canplas Inc...
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