Both tanks in the figure below have a liquid depth $z.$ Tank $($a$)$ discharges a jet of diameter

D through the rounded orifice from whence it falls freely, whereas tank $($b$)$ has a pipe with

rounded entrance connected to it$,$ and after a length $L,$ it discharges a jet, also of diameter

D$.$ Which of the two systems has greater discharge through it$?$ In answering this question,

first compare the velocities and discharges at points $1$ and $2$ in system $($a$)$ with

corresponding points in system $($b$).$