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Thread: Gravity Sump

  1. #1
    Patrick McCaffery's Avatar
    Patrick McCaffery Guest

    Default Gravity Sump

    I recently inspected a split level home which had a gravity sump. There is no pump, there are two pipes coming in to the sided of the crock and one pipe in the center, where the water seems to drain out. Can anyone explain how this system works.

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  2. #2
    Jerry Peck's Avatar
    Jerry Peck is online now Member
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    Default Re: Gravity Sump

    Drain tiles drain into the crock, the water drains out the bottom. All by gravity to a lower point of discharge.

    You only need a pump when you have to pump uphill, otherwise water flows downhill pretty good on its own.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
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    Default Re: Gravity Sump

    Also the sediments that may wash in from the tile are trapped in the bowl and not into the drain.

    Raymond Wand Home Inspection Service
    http://www.raymondwand.ca
    The value of experience is not in seeing much, but in seeing wisely.

  4. #4
    Patrick McCaffery's Avatar
    Patrick McCaffery Guest

    Default Re: Gravity Sump

    Thank you gentlemen,
    I appreciate your response.


  5. #5
    Stacey Van Houtan's Avatar
    Stacey Van Houtan Guest

    Default Re: Gravity Sump

    If this home is on a lot that would not allow the center drain to go to daylight then this is what we call a sub-slab floor drain. That means that the center drain will go to the sewer. This will many times mean that the area the home is in will have a combination storm/sewer. If the storm water overwhelms the system it can back up into the basement, a backwater valve is a suggested upgrade in this sitiuation.
    Had a basement last year do this 2 days after closing, i was glad that i had reported the suggested upgrade.


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