Floods Predicted from Rainfall Frequencies

by Lee Robinson, Asst. Prof. of Engrg.; Idaho State Univ., Pocatello, ID,
Theodore T. Williams, Assoc. Prof. of Civ. Engrg.; Montana State Univ., Bozeman, MT,

Serial Information: Journal of the Hydraulics Division, 1972, Vol. 98, Issue 10, Pg. 1773-1787

Document Type: Journal Paper


Short streamflow records often make predicting the frequency of floods on small watersheds difficult. As peak-flow rates are related to rainfall, at least in part, a logical approach in predicting floods is to utilize long rainfall records which are often available. Using this approach, a method is developed to predict floods on small Montana watersheds. The method uses mean annual flood, determined from short streamflow records, and three factors relating the frequency distribution of rainfall intensities to the frequency distribution of peak annual flows. An example shows how the method can be applied.

Subject Headings: Frequency distribution | Rainfall frequency | Flood frequency | Streamflow | Watersheds | Peak flow | Rainfall intensity | Flow distribution | Montana | United States

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