Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1² / (V1² - V2²)
(V­1 - V2) / V1
V1 / (V1 - V2)
(V­1² - V2²) / V1²

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