Forum Title: Math Question for Plumbing Nerds
I have a slab of concrete 100 ft x 20 ft that builds up storm water underneath and tends to lift the slab at its weakest points. So a 6" diameter pipe is inserted vertically through the concrete into the soil below. The 6" vertical pipe rises 15 feet before going horizontal to gravity drain. How many PSI needs to build up below the concrete to force the water 15' vertically in this 6" pipe? Will the concrete heave/lift before that pressure is met?
Category: Plumber Post By: DON AUSTIN (Plainfield, NJ), 04/23/2017

Now that I have been sarcastic.... I don't know what concrete weighs per cubic inch. But with the standard 4 or 6 inch thick slab, I doubt that it weighs 6.5 lbs per square inch, so I think you need a pump.

- CARL PHILLIPS (Springfield, IL), 09/11/2017

6 1/2 PSI. Ask a structural engineer.

- THELMA GREENE (El Paso, TX), 09/25/2017

1.47 gallons per foot x 15 = 22.5 gallons 22.5 gallons x 8.34 weight per gallon = 183.86 pounds of water to push up. aint gonna happen,,,GOT PUMP? water will equal itself out, it wont rise without the hole thing rising i am not a math nerd, so my answer is most likely wrong..

- LAURIE ESTRADA (Laguna Niguel, CA), 09/28/2017

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