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Thread: Slope Equation for Self Cleaning Sewage Pipes

  1. #1

    Slope Equation for Self Cleaning Sewage Pipes

    Hello all

    I was wondering if someone could help shed some light on an equation I found regarding obtaining the slope of sewage pipes in the following paper:-

    The paper attached Page 1.PNGPage 2.PNGPage 3.PNGPage 4.PNG

    The equation that is quoted to obtain the slope (equation 13) is given as:-

    S = 4.65 * N^2 * D^(-4/3) * (q/Q)^(-1/2) * v^2

    I was wondering if anyone could figure out what the variables q and Q referred to as these variables are not defined in the paper.

    I think Q = Flow Rate but no idea what q refers to.

    Can anyone help?

    Thank you.

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    q appears to be a flow rate where on page 4 (q / Q ) appears to be a flow rate ratio.

    The document in question should provide declaration for each variable.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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