Discharge from a Tank

Orifice Coefficients for Water

Description	Cd	Cc	Cv
sharp-edged	0.62	0.63	0.98
round-edged	0.98	1.00	0.98
short tube (fluid seperates from walls	0.61	1.00	0.61
short tube (no seperation)	0.82	1.00	0.82
short tube with rounded entrance	0.97	0.99	0.98
reentrant tube, length is less than one-half of pipe diameter	0.54	0.55	0.99
reentrant tube, length 2 to 3 pipe diameters	0.72	1.00	0.72
smooth, well tapered nozzle	0.98	0.99	0.99