Compute, by the rational method, the design flows for the pipes shown in the accompanying...

Compute, by the rational method, the design flows for the pipes shown in the accompanying sketch: 1-1 to M-4, M-4 to M-3, M-3 to M-2, M-2 to M-l, and M-l to outfall. A-l = 2.1 acres, c1 = 0.5; A-2 = 3.0 acres, c2 = 0.4; A-3 = 4.1 acres. c2 = 0.7. Pipe flow times are 1-1 to M-3,1 min, and M-3 to M-l. 1.5 min.