A wide rectangular channel has a bed slope of 8 cm/km and carries a specific discharge of 1.5  /s/m. The channel terminates into a sudden fall. Determine the length of the water surface profile,...

A wide rectangular channel has a bed slope of 8 cm/km and carries a specific discharge of 1.5
 /s/m. The channel terminates into a sudden fall. Determine the length of the water surface profile, assuming a critical depth at the sudden fall. Take the Chezy coefficient as 40 (metric).

A triangular channel with a bed slope of 20 cm/km and a side slope of 1: 1 carries a discharge of 0.6
/s. The Chezy coefficient is 50 (metric) and the channel ends with a sudden fall. Determine the normal and the critical depths. Hence, find the length of the water profile if the flow has a critical depth at the fall.