How do hydrometeorologists estimate the likelihood of major rainfall events?

In the field of hydrometeorology, experts estimate the likelihood of major rainfall events by analyzing historical data and applying statistical methods to determine the recurrence interval of storms. Because it is impossible to predict the absolute maximum precipitation for a specific location with total precision, hydrometeorologists rely on two primary approaches:

• Empirical Analysis: This involves examining past storm records to determine the frequency with which rainfall of a specific intensity or volume has occurred at a given location or across a catchment area. These assessments generally assume a specific probability distribution to represent rainfall characteristics.12
• Theoretical Calculations: When historical data is insufficient, experts use theoretical models to statistically maximize the various meteorological factors—such as storm duration, intensity, and local topographic effects—that control precipitation.2

These estimates are critical for the design of infrastructure like dams and reservoirs, where planners must account for the greatest expected precipitation within a specified timeframe.32