For the most hydraulically efficient rectangular open channel, the channel width is equal to:
Correct answer: D. Twice the flow depth
- A. The flow depth
- B. Half the flow depth
- C. Three times the flow depth
- D. Twice the flow depth
Explanation
For the best hydraulic rectangular section, the width is twice the flow depth. This condition gives the minimum wetted perimeter for a specified flow area and therefore maximizes hydraulic efficiency.
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About Hydraulics and Water Resources
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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