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# What is the minimum sewer pipe slope?

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The minimum sewer pipe drain slope is directly correlated to the diameter of the pipe in inches. For example, a pipe diameter of 4 inches would have a minimum sewer pipe drain slope of 0.0084.

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The calculation used to calculate the slope of the sewer pipe drain is S={V/[1.486/n*(D/4)^(2/3)]}^2. Slope is useful in draining sewer pipes because is is calculated to provide a minimum cleansing velocity for when the pipe is at a full flow or half flow. The minimum velocity is typically two to three feet per second. For larger pipe diameters, other considerations, such as ground subsidence may be evaluated in the calculations.

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## Related Questions

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Using a high-pressure water jet with a psi of 4,000 pushes away the blockage, according to SFGate. If there is a root clog in the sewer line, flushing copper sulphate or a root-killing foam in the toilet effectively dissolves the blockage. An auger is another effective tool in removing matter.

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A sewer cleanout cap is a fitting that screws into the cleanout to keep it closed when it is not in use. When a clog forms in the line, removing the cap allows the access into the line to remove the problem.

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The Sewer Jet Gazette advises that you use a sewer jet attachment on a pressure cleaner or a mechanical drain cleaner to unclog a main sewer drain. First, though, you need to find a proper access point, which is generally a main drain cleanout opening located in a basement or outside the house. They are generally on horizontal or vertical pipes with round caps with a square fitting on top.