A rectangular channel is 3.9 m wide has a Manning’s number = 0.025, a longitudinal bed slope of 1 in 130 and conveys X m3/s of water. Showing the steps in your answer as clearly as possible, determine (a) The normal depth of flow (b) The critical depth of flow (c) Whether the channel flow is sub- or super-critical (for X, take the sum of the digits of your student number) (26)