 # Sewer design calculations

### By Transparent Blue

Calculate the design diameter and slope for a section of sewer pipe.

The Manning Equation is used for Calculation of Pipe Diameter and Slope.

Input knowledge are design flow, elevations of ground initial and ultimate.

The app can be utilized in the SI or US units.

Example: The design flow price for a section of storm sewer between two manholes is: Qdes = 10 l/s. Find a mixture of a regular pipe diameter and pipe slope to make use of for this part of sewer to meet the criteria of minimun tractive drive.

The required minimum tractive force for sanitary sewer in the app is considered as 2 N/m2.

See answer of example within the screenshot.

- Initial ground elevation = 10 m (ground elevation of initial and final manholes is used to calculate the bottom slope and check that slope of the pipe just isn't lower than ground).

- Final floor elevation = 9 m

- Length of pipe = 60 m

- Desired circulate = 40 liters per seconds

And because of the design, after urgent the calculate button, we get the following outcomes:

Slope: 0.02 m / m, equivalent to 2%

Pipe diameter: 0.3 m

height of water within the pipe (depth / diameter): 40%

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