Water flows in a wide channel of Manning's roughness of 0.03 at a discharge per unit width of 3 m³/sec/m. The channel has a long reach of S = 50 cm/km, followed by a horizontal reach A-B of 500 m length, followed by a long reach of S = 20 cm/km as shown below.
Calculate the normal and critical depth values of the two long reaches and determine the type of slope.
Calculate the water depth values at points A and B and the energy lost between A and B. Use a suitable method of water surface profile calculation and use only one step.
Draw a neat sketch of the water surface profile, showing CDLs, NDLs and the variation of water surface. Label all profiles.