The continuous flow in a horizontal, frictionless rectangular open channel is subcritical. A smooth step-up bed is built downstream on the channel floor. As the height of the step-up bed is increased, choked condition is attained. With further increase in the height of the step-up bed, the water surface over the step-up bed will decrease to the extent that it will be above the critical depth. flow will stop.

Structural Analysis
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ISBN:9781337630931
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Chapter2: Loads On Structures
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The continuous flow in a horizontal, frictionless rectangular open channel is
subcritical. A smooth step-up bed is built downstream on the channel floor. As
the height of the step-up bed is increased, choked condition is attained. With
further increase in the height of the step-up bed, the water surface
over the step-up bed will decrease to the extent that it will be above the critical
depth.
flow will stop.
over the step-up bed will decrease to the extent that it will be below the critical
depth.
upstream will increase to the extent that it will create supercritical flow over the
step-up bed.
Transcribed Image Text:The continuous flow in a horizontal, frictionless rectangular open channel is subcritical. A smooth step-up bed is built downstream on the channel floor. As the height of the step-up bed is increased, choked condition is attained. With further increase in the height of the step-up bed, the water surface over the step-up bed will decrease to the extent that it will be above the critical depth. flow will stop. over the step-up bed will decrease to the extent that it will be below the critical depth. upstream will increase to the extent that it will create supercritical flow over the step-up bed.
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