Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Actual discharge through an orifice to the theoretical discharge
Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)

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