onlinechannel15b:   Rating curve 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:

Stream or river (optional):  

Select:    

Bottom width b :    
 

Flow depth y :    
 

Side slope z1 :    
 

Side slope z2 :    
 

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:

Stream or river (optional):
 

Discharge
Q:   

Flow velocity
v:   

Froude number
F:   

Exponent of the rating
β:   

Neutrally stable Froude number
Fns:   

Vedernikov number
V:   

NyQA
0000

Discharge-area rating:   Q = α A β

Coefficient:  α =

Exponent:  β =

Neutrally stable Froude number:  Fns =

            

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