In a cross-section given below, Manning's roughness coefficients are 70 (ki), 40 (k2), 30 (k3), and 20 (k4), respectively, and hydraulic slope is 0.0001. Calculate the water depths for the first and last stages in the main canal a) Qfirst = 7.253 m/s, b) Qlast = 45.011 m/s. Solution 2: 1 1.5 k The last stage The first stage k 1.0 y m 1.0 y m 1.5 ym k 2.5 y m k 1.5 1 k3 2.5 y m k 1.5 k4 2.5 y m 1.5