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Redefining Rainfall Classification

WRPMD 1999 — Preparing for the 21st Century
Proceedings of 29th Annual Water Resources Planning and Management Conference
Michael K. Glazner, Saša Tomić, and Benjamin White

Product Development & Support, Haestad Methods, Inc., 37 Brookside Drive. Waterbury, CT 06708‐1 129

  • Abstract
Phrases such as “S‐year rainfall” or “loo‐year storm” are commonly used in everyday life to describe rainfall events. However, these phrases are frequently confusing to the general public and insufficient for practicing engineers. For an average news listener, a phrase such as “5‐year event” does not say much about the severity of the rainfall event. Additionally, this phrase is not of much help to a practicing engineer since it does not include the duration of the rainfall event in question. This paper suggests a new method of classifying rainfall events. The proposed Haestad Severity Index (HSI) categorizes rainfall events using ten levels of magnitude.

© 2004 ASCE

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ISBN:

0‐7844‐0430‐5

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