onlinechannel15.php:   Calculation of discharge Q in a prismatic channel using the Manning equation

Definition sketch for a prismatic channel
Formulas:

P = b + 2y(1 + z2)1/2
T = b + 2zy
A = y(b + zy)
R = A/P
D = A/T
Q = (C/n) AR2/3S1/2
V = Q/A
F = V/(gD)1/2
INPUT DATA:

Select:      

Bottom width b:        

Flow depth y:        

Side slope z:      

Manning's n:      

Bottom slope S:      

INTERMEDIATE CALCS:

Units selected:   

Grav. accel. [ g ]:   

Constant C:   

Wetted perimeter P:   

Top width T:   

Flow area A:   

Hydraulic radius R:   

Hydraulic depth D:   

OUTPUT:

Discharge Q:   

Flow velocity V:   

Froude number F:   

Press button to
or recalculate

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