Water is flowing through a $D=16\mathrm{.}0cm-$diameter pipe that consists of a $h=2\mathrm{.}7m-$long vertical and $W=2\mathrm{.}4m-$long horizontal section with a $90$ elbow at the exit to force the water to be discharged downward, as shown below, in the vertical direction. Water discharges to atmospheric air at a speed of $V=4\mathrm{.}2\frac{m}{s},$ and the mass of the pipe section when filled with water is $15\mathrm{.}3$ kg per meter length. Determine the moment acting at the intersection of the vertical and horizontal sections of the pipe $($point A$).$