X–Year, Y–Duration Rain The magnitude of rainfall which has a 1-in-X chance of being exceeded in any future one-year time period with a duration of Y hours or days. X–year rains must have durations associated with them, e.g., 25–year, 6–hour rain, 50–year, 24–hour rain, 100–year, 10–day rain, etc. These values are statistically derived using past rainfall records. Also referred to as Rainfall Duration-Frequency. Also see X–Year Flood.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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