That water can back up into the house in a flooding rain because the city sewer is overwhelmed.
The floor of my basement is backing up.
And while it is commonly held that a sewer drain backs up largely because there is a blockage or break in the sewer line some homes have floor drains attached to the storm sewer system.
That is because most floor drains rarely take in any water the usual problem is the opposite.
Therefore the source of the clog may is usually not the basement floor drain itself.
There s water in the basement.
First you need to determine if it is local waste produced in your home that can t get out due to a blockage in the main line leaving your home or if it is waste from the sewer system coming back in called a backflow.
A basement drain backing up is also one the most difficult clogs to diagnose as water seeks the lowest level to escape.
The cure for that is simply dumping some clean water into the drain to refill the trap.
This happens because of the waste produced in your home or waste from the public sewer system.
So your basement floor drain is backing up and flooding.
A floor drain back up in your basement is almost never due to the floor drain.
That s because as the lowest drain in your home the floor drain will be the first place that wastewater can go when it can t flow to the main drain and sewer line.
That is to say the drain and trap dry out then let in sewer gases.