Manning Equations Formulas Calculator

Fluid Mechanics Hydraulics

Solving For Roughness Coefficient.

Roughness Coefficient

Inputs:

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

hydraulic radius (R)
= 0
= 0
foot
energy grade line slope (s)
= 0
= 0
flow velocity (V)
= 0
= 0
foot/second

Solution:

roughness coefficient (n)
= HAS NOT BEEN CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
flow velocitySolve for flow velocity
hydraulic radiusSolve for hydraulic radius
energy grade line slopeSolve for energy grade line slope
roughness coefficientSolve 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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