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    bh6875's Avatar
    bh6875 Posts: 2, Reputation: 1
    New Member
     
    #1

    Feb 4, 2011, 05:56 PM
    How much slope to put in a 4 inch drain pipe over 73 feet?
    PlumbRob7's Avatar
    PlumbRob7 Posts: 5, Reputation: 2
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    #2

    Feb 4, 2011, 09:50 PM
    Should be 1/8" per foot so there would be 9 1/8" difference in elevation over 73 feet.
    ChazC's Avatar
    ChazC Posts: 5, Reputation: 1
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    #3

    Feb 5, 2011, 12:33 PM
    A good rule of thumb for wastepipe carrying solids,1/4 per foot is considered optimum.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #4

    Feb 5, 2011, 01:03 PM

    Yea but that is for 3" or smaller drains. A 4" only needs 1/8"
    PlumbRob7's Avatar
    PlumbRob7 Posts: 5, Reputation: 2
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    #5

    Feb 5, 2011, 05:47 PM
    1/4" per foot would be optimum if you have the height to fall 18.25"

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