Free Online Manning Irregular Channel Calculator

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Irregular Channel Manning Uniform Flow Calculator

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Inputs
X
X
Results
Q Q X
Cross section points +/- (or Copy/Paste using data area)
Point Segment Region
Sta

 Elev
n
for seg-
ment 		Rh, Q
region
boundary
(Bank) 		Bot.
shear
τ
T
Pw
A
Rh
Comp.
n 		v
Hv
Fr Q

Points data
(comma or tab separated)

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Notes

Composite n
This calculator follows HEC-RAS Reference Manual in calculating region composite n using Chow 1959, page 136, equation 6-17 (not 6-18).
Rock lining
Use the Manning Trapezoidal Channel Calculator to design rock lining. This calculator is more for natural sections.
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