(6) A pipe of diameter D=9" has a mean velocity of U=4 ft/s. The pipe splits with some of the flow entering a pipe of diameter D2=3"" with a velocity

of U2=6 ft/s. The remaining flow enters a square channel of side length L=0.75 ft running partially full with a mean velocity of U3=4 ft/s.Calculate the depth of flow in the channel.