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Pipe Flow Tool

MANNING EQUATION -- PIPE FLOW CALCULATOR
Roughness Coefficient × Hydraulic Radius × Pipe Slope = Velocity (ft/s) or Volumetric Flow (cfs)
(Ft) (Ft/Ft)
Trulli

Hydraulic Radius

R = (Ft)

H = (Ft)

Θ = (Degrees)

Trulli

Pipe Slope

X = (Ft)

Y = (Ft)

ROUGHNESS COEFFICIENT
Material Coefficient
PVC 0.010
Steel 0.012
Concrete 0.011
Cast Iron 0.012
PolyEthylene 0.012

V = (kn / n) × R2/3 × S1/2