§ 5.4.1. Flow Equation Method

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Q = AV and (Eq. 5-1)
Q = (1.49/n) AR ^2/3 S ^1/2 (Eq. 5-2)
Where,
Q = Pipe Flow, cfs

A = Cross-sectional area of flow, ft

V = Velocity of flow, ft/sec

n = Coefficient of roughness of pipe

R = Hydraulic radius = A/W _p , ft

S = Friction slope in pipe, ft/ft

W _p = Wetted perimeter, ft

                    
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