Fig. 3.2 shows a rectangular channel that is used to carry a volume of 330 m of water every minute from one process tank to another within a wastewater treatment works. With this flow, the channel flows with a depth of (v = 0.5 m) over a channel width of (b = 2.0 m). For the chatU).el lined with unfinished concrete (n = 0.017), complete the following design tasks: a) Calculate the critical depth. b) Calculate the minimum specific energy in the channel. c) State whether the flow in the channel is critical, subcritical or supercritical. d) For the flow depth, y = 0.50 m, determine the specific energy and the alternate depth for this energy. e) Determine the Froude number for each depth in (d). Fig. 3.2