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The flow in a very wide rectangular channel tends to a freefall at which the depth...

The flow in a very wide rectangular channel tends to a freefall at which the depth is reduced to 0.67 times the normal depth. The channel conveys a specific discharge of 4 m3/s/m and has a bed slope of 10 cm/km. Estimate the distance upstream of the fall where the water depth is 0.9 times the normal depth. Take the Manning coefficient as 0.025 and use the step-by-step (direct step) method.

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Answer #1

Applying the direct step method in a single step we will find the distance between the two required points as shown below:

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