A rectangular channel 3.6 m wide contracts to a 1.8 m wide rectangular channel and then expands back to the 3.6 m width.

A rectangular channel 3.6 m wide contracts to a 1.8 m wide rectangular channel and

then expands back to the 3.6 m width. The contraction is gradual enough that head

losses can be neglected, but the expansion loss coefficient is 0.5. The discharge

through the transition is 10 m3/s. If the downstream depth at the re-expanded section is

2.4 m, calculate the depths at the approach section and the contracted section. Show

the positions of the depth and specific energy for all three sections on a specific energy

diagram.