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Sewage pipes must slope down 1/4 centimetre in order to drain properly. What is the required slope? Calculate the percentage grade of the slope. - Quora
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Can a bathroom drain pipe be placed in 90 degrees, or do they really need a slope? - Quora
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A Soggy Slope: Case Study - Masseo Landscape Inc.
French Drain on a yard with little slope - How to terminate? : r/landscaping
How To Build a Yard Drain System with No Slope [ COMBO INSTALL! ] - YouTube
IAPMO
Determine the proper depth + slope for a French Drain.
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plumbing - Do I need a slope in drain lines under sink? - Home Improvement Stack Exchange
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