h1 = [infinity], [epsilon] = 0 and Q/Q1 = 1;
and for
h1 = 0, [epsilon] = 1 and Q/Q1 = 0.96.
So that in this case also the difference between the simple formula
(5) and the formula above, in which the variation of head at different
parts of the orifice is taken into account, is very small.