flood-frequency analysis

Flood-frequency analysis is a method used in hydrology to predict the probability of future flood events based on historical data. It involves analyzing past peak discharge records to estimate the magnitude and recurrence interval of floods. For instance, a "100-year flood" is a flood magnitude that has a 1% chance of being equaled or exceeded in any given year.12

This analysis is crucial for engineering design, such as for dams and reservoirs, and for floodplain management. It helps in understanding risks associated with floods, which can result from heavy rainfall, ice jams, storm surges, or tsunamis. While historical records are valuable, predicting extreme events with low frequencies requires extensive data.12