If the return period of a flood is 50 years, its approximate annual exceedance probability is:
Correct answer: B. 2 percent
- A. 0.5 percent
- B. 2 percent
- C. 5 percent
- D. 50 percent
Explanation
For an event with return period T, the annual exceedance probability is approximately 1/T. Thus, 1/50 equals 0.02, or 2 percent, assuming the usual independent annual-event interpretation.
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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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