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How would you determine the grade of a drainage pipe?


   
underground drainage

Imagine you are a civil engineer and a company has hired you to determine a grade of a pipe that will transport water underground effectively.

How would you start and what would you do, I need to know as that is my drainage challenge. Also, how could trigonometry be used in this situation if you knew how to do it?
3 Responses to “How would you determine the grade of a drainage pipe?”
  1. Corey Said:

    would have to figure out how much would go thru the pipes in a certain ammount of time

  2. Robert Crane Said:

    In general, the pitch or drop per unit length is set by the building code in your area.
    The grade or pitch is the drop per unit length.
    In trig it’s the opposite (drop) over the adjacent (length) = tangent.
    So if the drop were specified to be 1/4 inch per 10 feet, the angle is the arctan of 0.025
    The easiest way to measure that angle would be with surveyor’s instruments or get a mathematician.

  3. SATEROM Said:

    there is a couple of ways to approach the problem … is this for underground drainage or for water supply?
    1 for drainage, a rule of thumb to use is 1/4 inch per foot (2%), but as you get into larger pipe sizes, 0.5% has been found to work although it depends upon the sediment load. A water velocity of about 5 fps will generally move light sediment loads.

    2 for any size of pipe, determine the friction loss of the pipe, and grade the pipe to overcome this loss, with a little extra grade to account for the placement of the pipe perhaps not being exactly correct.

    3 trig is just the slope of the pipe, tangent thereof.


  

Posted in Underground Drainage


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