§ 5.5.1. Friction Losses

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Friction loss is the energy required to overcome the roughness of the pipe and is expressed as:
H _f = (29n /R ^1.33 )(V /2g)L (Eq. 5-3)
Where,
H _f = Friction loss, ft

n = Manning's Coefficient

L = Length of pipe, ft

R = Hydraulic radius, ft

V = Velocity of flow, ft/sec

g = Acceleration due to gravity, 32 ft/sec

                    
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