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    khajanajmuddin's Avatar
    khajanajmuddin Posts: 1, Reputation: 1
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    #1

    Apr 29, 2012, 11:24 PM
    1:200 slope for drainage pipe
    What is the formula to calculate slope for drainage pipes?
    For example 1:200 slope for 200mm pipe?
    smearcase's Avatar
    smearcase Posts: 2,392, Reputation: 316
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    #2

    Apr 30, 2012, 04:47 PM
    In my experience in U.S. highway construction, drainage (storm) is normally expressed as a percentage.
    I would interpret a 1:200 factor (although I have never seen it with drainage drawings) to be one foot of drop in 200 feet, or a 0.5% gradient, calculated by dividing the amount of fall (1 foot) by the horizontal distance, then multiplying by 100 for percent of gradient.

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