Sewer design calculations

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# Description

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 data are design flow, elevations of ground initial and final.

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

Example: The design flow rate for a section of storm sewer between two manholes is: Qdes = 10 l/s. Find a combination of a standard pipe diameter and pipe slope to use for this section of sewer to meet the criteria of minimun tractive force.

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

See solution of example in the screenshot.

- Initial ground elevation = 10 m (ground elevation of initial and final manholes is used to calculate the ground slope and check that slope of the pipe is not less than ground).

- Final ground elevation = 9 m

- Length of pipe = 60 m

- Desired flow = 40 liters per seconds

And as a result of the design, after pressing the calculate button, we get the following results:

Slope: 0.02 m / m, equivalent to 2%

Pipe diameter: 0.3 m

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

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# What's New

Improvements. Errors in labels are corrected. Simplified a bit with the incoming data.

# Additional information

Updated

February 2, 2014

Size

63k

Installs

100 - 500

Current Version

1.3.4

Requires Android

1.6 and up

Content Rating

Unrated

Content Descriptors

Warning – content has not yet been rated. Unrated apps may potentially contain content appropriate for mature audiences only.

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# More from developer

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The total pressure loss in the system results from the combined losses due to friction in length of pipe and friction losses due to valves, fittings, and other components. The first are "major losses" associated with energy loss per length of pipe, and seconds are "minor losses" associated with bends, fittings, valves, etc.

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Calculate pressure losses in a pumping of 10 l / s. The diameter of the suction and discharge is 100 mm or 4 ". We have the following items on the Suction: 1 foot valve, 1 gate valve , 1 elbow 90, 1 contraction to 3" to entering the pump. In the discharge we have: 1 expansion, 2 elbow 90,

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The Hazen–Williams equation is an empirical formula which calculates pressure drop of water in circular pipes caused by friction. It is used in the design of water pipe systems such as fire sprinkler systems, water supply networks, and irrigation systems.

The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number, but it has the disadvantage that it is only valid for water.

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It allows to calculate the flow is conducted in an open channel for the given data, under uniform steady flow. It uses the Manning’s Equation.

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