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Manning Equations and Formulas Calculator
Fluid Mechanics Hydraulics


Solving For Roughness Coefficient

Roughness Coefficient


Inputs:
hydraulic radius (R) 
energy grade line slope (s) 
flow velocity (V) 


Conversions:
R = 0    = 0  foot
S = 0    = 0  
V = 0    = 0  foot/second


Solution:
roughness coefficient (n)  =  HAS NOT BEEN CALCULATED 


Other Units:


Change Equation
Select an equation to solve for a different unknown

flow velocity Solve for flow velocity
hydraulic radius Solve for hydraulic radius
energy grade line slope Solve for energy grade line slope
roughness coefficient Solve for roughness coefficient

Where
V  =  flow velocity
R  =  hydraulic radius 
s  =  energy grade line slope 
n  =  coefficient of roughness 


References - Books:

1) Warren Viessman, Jr, Mark J. Hammer. 1993. Water Supply and Pollution Control. Harper Collins College Publishers. 5th ed.





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