In an open channel, flow is classified as subcritical when the Froude number is:
Correct answer: B. Less than one
- A. Equal to zero
- B. Less than one
- C. Equal to one
- D. Greater than one
Explanation
Subcritical flow has Froude number less than one, meaning gravitational effects dominate inertial effects. It is usually deeper and slower than supercritical flow.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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