Holy crap! We were just sent the link to a video the plaintiffs in the Corcoran lawsuit made a couple of years ago to document the flooding problems in their newly purchased condo at 357 4th Street.
Corcoran Found Negligent in Park Slope Condo Sale [Brownstoner]
State Supreme Court Rules Corcoran “Negligent” [TRD]
E-mail Shows Couple’s Suit vs. Corcoran Group Holds Water [NYDN]


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  1. I would say that less than 10% of homes in Park Slope have check valves. Probably more than 50% still have lead water mains.

    Check Valves are not a construction quality or code item so an inspector would have no reason to “flag” it. There definitely seem to be other foundation leakage problems with the house but (from the short video) it looks like most is coming in from the cellar front door.

  2. It looks like most of the water is coming up from an under stoop drain (if you pause when he opens the door you can see the water ‘mound’ over the drain hole).

    This happens VERY often in Park Slope when it rains heavily. The combined storm-sewer system is overloaded and you get a “backflow” condition where sewer water runs INTO your drain pipes instead of out.

    Most of this can be prevented with a plumbing item called a “check valve.” Any good plumber will be able to install one on your main drain line. One drawback: Until the flow resumes it’s normal course (out, not in) you can’t use your plumbing fixtures. That said, it normally subsides after an hour or two.

    There also looks to be water coming in from the HVAC PVC lines from foundation hydrostatic pressure (a bigger deal and not as easily corrected).

  3. If they could prove it’s a company-wide practice there might be a class-action lawsuit in this. The Corcoran broker (not this one) who sold our house to us also canceled open houses on rainy days and once we moved in we learned the basement would flood through the back door just like this video. In our case it wasn’t difficult to fix. Still, it all begs the question did both brokers separately decide to do that or was it the company’s instruction to brokers?

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