Re: Basement flooding even after new check valve installed...

Posted by iabide on 2017/5/12 16:44:08
Science is fun!!!

On that note, as KOCTEP hints, if the back-up in your "house" water (rain + flushes) is higher than whatever the sewer system is seeking, it will find that level somewhere in your house. As a downtown resident, I sometimes get the feeling that level is somewhere halfway between me and the Heights during the intense storms like Friday's.

Also, all this assumes static water pressure; dynamic pressure from movement on the city side may affect check valve functionality at near-neutral pressure, depending on which kind of check valve you may have. Finally, the house water can absolutely accumulate in your pipes (like roof water from Friday's intense dump) faster than it can equalize with where ever the sewer system's "level" may be (1/2 way up to the Heights?) ...thus, again, encouraging it to "level" in your house. To paraphrase Keynes, the pipes can remain out-of-level longer than my floor can remain dry.

Also, jcneighbor: a gentle suggestion to go easy on the snark. Your description of fluid dynamics is incorrect. Static water pressure is not a function of the volume of water, just elevation. A 6" swimming pool of water draining through a straw exerts the same amount of pressure as a 6" test tube at the same elevation draining through a straw of equal diameter. Even if the swimming pool weighs much, much more.

If my science is off, please do let me know. I would appreciate being corrected.

Thanks for the chat everyone and have a safe, dry weekend.

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