Free Online Manning Pipe Head Loss Calculator

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Manning Formula Head Loss at Given Full Flow

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Inputs

Flow, Q		X
Pipe diameter, d₀		X
Length, L		X
Manning roughness, n ?		X
Loss coeff., k_m?		X
Downstream EGL		X

Results

Area, A	Area, A		X
Wetted perimeter, P_w	Wetted perimeter, P_w		X
Hydraulic radius, R_h	Hydraulic radius, R_h		X
Velocity, v	Velocity, v		X
Velocity head, h_v	Velocity head, h_v		X
Velocity check	Velocity check		X
Friction slope	Friction slope		X
Average shear stress, τ	Average shear stress, τ		X
Friction loss, h_f	Friction loss, h_f		X
Minor (local) loss, h_m	Minor (local) loss, h_m		X
Total loss, h_L	Total loss, h_L		X
Downstream HGL	Downstream HGL		X
Upstream EGL	Upstream EGL		X
Upstream HGL in pipe (See notes)	Upstream HGL in pipe (See notes)		X

Notes

For an open inlet (culvert) condition, it is necessary to check for inlet control conditions.: 1. The upstream HGL must be above the upstream normal depth flow elevation (and higher than the pipe!).; 2. The headwater of a culvert is better represented by the upstream EGL than the upstream HGL.; 3. See my 2-minute tutorial for simple standard culvert headwater calculations using HY-8.