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Thread: 3" or 4" PVC for Sump Discharge Exterior Drain Line?

  1. #1

    Smile 3" or 4" PVC for Sump Discharge Exterior Drain Line?

    I want to run the exterior discharge from a sump pump into a solid PVC drain line, to be buried just below the surface, probably. Is 3" PVC drain line probably adequate, or would 4" PVC be better? This pipe will run approximately 100 feet, and be connected to a catch-basin and its drain line. Sump pump cycles on and off about once a minute, more or less, for much of the year. We have cold winters, averaging about 60" of snow a year. Would 4" PVC be less prone to have freezing issues? Please advise. Thank you.

  2. #2
    Master Plumber Redwood's Avatar
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    Dec 2007
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    Probably not... Making sure that it is pitched properly so the water all runs out of the line will help a great deal though...

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