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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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