International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
3156. Darcy-Weisbach equation : Equation used for calculating head loss due to friction in a conduit and expressed as-

LV2
hf   = f .  ------
             D 2g

where,  hf is head loss due to friction (m, ft), f = Darcy-Weisbach friction factor (unitless), D = conduit diameter (m, ft), L = conduit length (m, ft), V = flow velocity (m/sec, ft/sec), g = acceleration due to gravity (m/sec2, ft/sec2)

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