Multiple choice

The flow in a horizontal, frictionless rectangular open channel is supercritical. A smooth hump is built on the channel floor. As the height of hump is increased, choked condition is attained. With further increase in the height of the hump, the water surface will

  1. rise at a section upstream of the hump

  2. drop at a section upstream of the hump

  3. drop at the hump

  4. rise at the hump

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation