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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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The main signs that a sewer drain is clogged are water backing up in a drain or toilet and gurgling noises from the drains. Low-lying floor drains in basements are often the first sites of water return, so keeping an eye on these drains can help to identify clogs early.

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If a home or building is on a city sewer system the draining water flows through the home's plumbing and into a single pipe that ultimately leads to the city's wastewater collection system. The water is then pumped into a treatment plant.

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A homeowner can find a sewer pipe in his yard by contacting the local sanitation or sewer district and determining where the main sewer line and connection is or by contacting a prior contractor of the home. It is also possible to dig in different parts of the yard to find the sewer pipe by trial and error, however, this method is inefficient.