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Closed Conduit Hydraulics – Friction and Minor Losses
Friction and minor losses are glossed over in the darcy-weisbach article but I want to throw in some extra notes here. Friction occurs over every bit of length of a close-conduit system and is usually a surprisingly high amount of energy loss. Friction depends on the material of the pipe and the velocity of flow. The formula for frictional head loss IS the Darcy-Weisbach equation.
$$ h_f = f \frac{L}{D}\frac{V^2}{2g} $$
