cofferdam is built in a river subject to annual flooding. The cofferdam will be in the river during four consecutive flood seasons, and it is decided to build it sufficiently high to protect against the 20-year flood. Determine the probability of occurrence of this flood during the cofferdam’s life. What is the probability that the cofferdam will not be overtopped during the 4 flood seasons?

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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.