How does a 10-year design storm frequency compare to a 100-year design storm frequency?

How does a 10-year design storm frequency compare to a 100-year design storm frequency?

• A. A. larger storm intensity per hour
• B. B. smaller storm intensity per hour
• C. C. the same one-hour intensity if the geographic location is the same
• D. D. the same one-hour intensity regardless of the selected storm frequency

Answer: (B)

In hydrology, the design storm frequency refers to the probability of a specific storm event occurring within a certain time frame. A 10-year design storm frequency implies that there is a 10% chance of a storm of that intensity occurring in any given year. Conversely, a 100-year design storm frequency indicates a storm that has a 1% chance of occurring in a given year. The intensity of precipitation associated with a 10-year storm is generally lower than that of a 100-year storm. This is because the severity of storms tends to increase with the return period. A 100-year storm is designed to handle more extreme rainfall events that are statistically less likely to happen but will yield significant impacts when they do occur. Consequently, the 10-year design storm will have a smaller storm intensity per hour when compared to the 100-year design storm. The rationale aligns with the concept that design storms are structured to account for increasing frequencies and intensities to manage the risk of flooding and other water-related hazards effectively.

In hydrology, the design storm frequency refers to the probability of a specific storm event occurring within a certain time frame. A 10-year design storm frequency implies that there is a 10% chance of a storm of that intensity occurring in any given year. Conversely, a 100-year design storm frequency indicates a storm that has a 1% chance of occurring in a given year.

The intensity of precipitation associated with a 10-year storm is generally lower than that of a 100-year storm. This is because the severity of storms tends to increase with the return period. A 100-year storm is designed to handle more extreme rainfall events that are statistically less likely to happen but will yield significant impacts when they do occur.

Consequently, the 10-year design storm will have a smaller storm intensity per hour when compared to the 100-year design storm. The rationale aligns with the concept that design storms are structured to account for increasing frequencies and intensities to manage the risk of flooding and other water-related hazards effectively.