For an open channel, the hydraulic radius is defined as the ratio of:
Correct answer: D. Flow area to wetted perimeter
- A. Top width to flow depth
- B. Wetted perimeter to flow area
- C. Flow area to top width
- D. Flow area to wetted perimeter
Explanation
Hydraulic radius is R = A/P, where A is the cross-sectional flow area and P is the wetted perimeter. The free-surface width is not included in the wetted perimeter.
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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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