Extracted text: Exercise [3] Calculate the depth d in which the discharge (Q=1.5 m³/sec) will flow through the channel with trapezoid-shaped cross section. Width of the channel bed is (b =2 m), slope of bed (S=0.05%), sides slope is (Z=1.5). The channel is excavated in gravel sends in which the roughness coefficient is (n =0.0247).