Free Online Manning Irregular Channel Calculator

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Irregular Channel Uniform Flow Calculator

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    --CAUTION: If you have downloaded the spreadsheet prior to August 31, you may have received incorrect results!--


Set units:
Results
Q by sum of segments
Q by sum of regions with composite n per Chow 6-17 equal velocities
Q by sum of regions with composite n per Chow 6-18 equilibrium of forces
Cross section points +/-
Sta
Elev n
for seg-
ment
Rh, Q
region
boundary
(Bank)
Q v T f Strickler
Implied
D50
MC
Requ'd.
D50
MRA
Requ'd.
D50
Searcy
Requ'd.
D50
Hv Shear
τ
A Pw Rh

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Notes

Q Methods
Q by sum of conveyances underestimates the frictional contribution from steep segments. Q by composite n overestimates the effect of wide shallow (overbank) friction on flow in deeper areas (main channel).
D50 Values
The Strickler D50 is the size (for a straight and clean channel) implied by the roughness entered. The other D50 results are required to resist erosion per 1) Maricopa County and Robinson Rock Chutes, 2) Maynord, Ruff, and Abt (1989), and 3) Searcy (1967)
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