### Partially FULL Pipe Flow Calculator and Equations

**Fluid Flow Table of Contents**

Hydraulic and Pneumatic Knowledge

This engineering calculator determines the Flow within a partially full pipe (&e1/2 full using the Manning equation. This calculator can also be used for uniform flow in a pipe, but the Manning roughness coefficient needs to be considered to be variable, dependent upon the depth of flow.

r = D/2

h = 2r - y y/D

Hydraulic Radius

R = A/P

Manning Equation

Q = (1.49/n)(A)(R ^{2/3} )(S^{1.2} )

V = Q/A

Equation used for n/n_{full} = 1.25 - ( y/D - 0.5) * 0.5 (for 0.5 ≤ y/D ≤ 1 )

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