$$What causcs the difference between the two manometer height reading $($A and BY$?(3$ pts$)$

$$Suppose there are two tankar with identical head levels and orifice diameters, but different orifice shapes one with a standard tharp$-$edged orifice and the other with a curved entrance orifice. Which orifice will generate a higher flow rate under the same head conditions, or will they produce the same flow rate? Provide an explanation. $[4$ pts$]$