For decades, the term “100-year flooding event” has been used to describe catastrophic floods that are statistically expected to occur, on average, once per century. However, this terminology is increasingly misleading in today’s world of climate change, urbanization, and shifting weather patterns. What was once considered an event with a 1% chance of happening in any given year is now occurring far more often, rendering the description outdated and even misleading in flood risk planning and communication.
