Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Area of jet at vena contracta to the area of orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Actual discharge through an orifice to the theoretical discharge
None of these

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Hydraulics and Fluid Mechanics in ME
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

Q = (2/3) Cd × b × √(2g) × (H23/2 - H13/2)
Q = (2/3) Cd × b × √(2g) × (H22 - H12)
Q = (2/3) Cd × b × √(2g) × (H2 - H1)
Q = (2/3) Cd × b × √(2g) × (H21/2 - H11/2)

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