A horizontal 50-mm-diameter PVC pipeline leaves (squareedged entrance) a water tank \(3 \mathrm{~m}\) below its free surface. At \(15 \mathrm{~m}\) from the tank, it enlarges abruptly to a 100 -mm-diameter pipe which runs \(30 \mathrm{~m}\) horizontally to another tank, entering it \(0.6 \mathrm{~m}\) below its surface. Calculate the flow rate through the line for a water temperature of \(20^{\circ} \mathrm{C}\), including all head losses.