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In order to calculate the maximum flow rate, what data do we need to include in our formula or what formula to use? Thank you in advance for your help and contribution! You need to know the slope, diameter, roughness “n”. The maximum flow occurs at 0. 94 full but most engineers just use the full flow capacity.

If the pipe is under pressure the Manning equation still applies but the slope is the slope of the hydraulic grade line. For your 12-inch pipe at a slope of 0. 003 flowing full the flow would be 1. 68 cfs and the velocity would be 2. 1 feet per second which is close to the minimum usually specified for sanitary sewers. I don’t know how to obtain wetted perimeter when it defines as the cross section dimension of the fluid to the culvert.

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Is the above formula identical to yours? 486 is the “k” value when using “English” units. For a full circular pipe the wetted perimeter is simply the pipe surface that is wet, i. Thus it is equal to Pi times the diameter. 12″ asphalt-dipped cast iron pipe with a rugosity ratio of 0.

0004, a friction drop of 0. 3 the assumed slope of 0. Kindly explain whether the difference stems from the assumed rugosity or from the quality of fluid, sewage waste water vs clean water, or from any other reason. The friction is the value of the friction head usually computed per 100 feet of pipe. The slope is the distance a pipe drops vertically over a certain length. 2″ vertically down for every 1′ of horizontal run.

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