Hydraulic Coefficients

HYDRAULIC COEFFICIENTS
Coefficient Of Contraction
Coefficient of contraction is the ratio between area of jet at vena contracta to the area of the orifice.it is denoted by Cc
Cc=Ac/a
Where,
Ac=>Area of the jet at vena contracta.
a=>Area of the orifice.
Value of Cc varies from 0.61-0.69
Coefficient Of Velocity
Coefficient of velocity(Cv) is the ratio of actual velocity of the jet at vena contracta to the theoretical velocity of jet.
Let,av=actual velocity of jet at the vena contracta
Vtheoretical is the theoretical velocity of jet at vena contracta=√2gH
Cv=V/Vtheo=V/√2gH
Value of Cv varies from 0.95-0.9
Coefficient Of Discharge
Coefficient of discharge(Cd) is defined as the ratio between actual discharge to the theoretical discharge.
ie,Qact/Qtheo
Where,
Qa=>Actual discharge through the orifice
Qt=>Theoretical discharge through the orifice.
Value of Cd varies from 0.60-0.64