Draw the M-curve for a trapezoidal channel 10 m bed width, 1:1 side slope, C = 100 (metric), then find from the curve : a. The critical depth for discharge 40 m/sec. b. The critical discharge at a depth of 3 m. c. Draw the o-curve for this channel then find: The critical slope corresponding to a depth of 3 m. The critical slope for a discharge of 40 m /sec.