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
Pipe length, L		X
Manning roughness, n ?		X
Total combined junction loss coefficient, k		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
Friction slope	Friction slope		X
Average shear stress (tractive force), tau	Average shear stress (tractive force), tau		X
Friction loss, H_f	Friction loss, H_f		X
Junction loss, H_m	Junction loss, H_m		X
Total loss, H_l	Total loss, H_l		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 cannot be lower than the upstream normal depth flow elevation (or lower 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.