# 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 Posts: 1,561, Reputation: 942 Ultra Member #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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