Probability plot A bridge will be built over the Meherrin River near the site that the discharge measurements were taken for the log-normal probability plot below. The service life of the bridge is 40 years. If a design discharge of 23,000 cfs is used for the bridge: (a) what is the probability that the bridge will be flooded in any one year? (b) What is the probability that the bridge will be flooded at least once over its service life? (Note: just focus on the “theoretical line” in the plot)

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Concepts of Flood Control

Flooding is a temporary overflow of water that submerges or covers the the usually dry land. It can also be defined as the overflow of the excess amount of water that covers a huge area of land which is normally dry.