oninechannel03.php: Discharge in a circular culvert [under atmospheric pressure]
Formulas

r = D/2
θ = 2cos-1[1 - (y/r)]
A = 0.5r2(θ - sinθ)
P = rθ
R = A/P
Q = (k/n) A R2/3 S1/2
V = Q/A
INPUT DATA:

Select:   

Culvert diameter D:     

Depth y:     

Bottom slope S:     

Manning coefficient n:     
 

INTERMEDIATE CALCS:

Constant k:   

Flow area A:   

Wetted perimeter P:   

Hydraulic radius R:   

Relative depth y/D:   

Froude number [based on y]:   

RESULTS:

Discharge Q:   

Flow velocity V:   

            

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