Basement flooding even after new check valve installed...

Posted by mfadam on 2017/5/9 11:55:26
We got flooded in Sandy/Irene. Not a surprise and post clean up we had a new check valve installed on the main pipe out to the street. When we get really intense rain like last Friday we still get water coming up from the cut out in concrete basement floor where the check valve is.

I'm pretty confident the check valve is working, but I'm trying to figure out what the cause might be. It only happens when there is pressure on the JC sewer system. Could it be that there is a small hole or crack in the main pipe somewhere between check valve and street that leaks when there are big rains/storms?

Curious if anyone else has had a similar experience... TIA

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