When is an orifice referred to be "large"?
1
If the liquid's head is less than 1.5 times the orifice's depth
2
If the liquid's head is lower, double the orifice’s depth by four.
3
If the liquid's head is less than 2.5 times the orifice's depth
4
If the liquid's head is less than five times the orifice's depth