Solution Coefficient of Velocity(CV ) is defined as the ratio between the actual velocity of a jet of liquid at vena-contracta and t he theoretical velocity of the jet. CV=
V
√2‌gH
Co-efficient of contraction( Cc ) is defined as the ratio of the area of the jet at vena-contracta to the area of the orifice. Cc=
ac
a
Co-efficient of Discharge ( Cd ) is defined as the ratio of the actual discharge from an orifice to the theoretical discharge from the orifice. By the relation Cd=Cc×Cv