A Versatile Methodology for Flood Frequency Analysis

by Krishan P. Singh, Illinois State Water Survey, Champaign, IL, USA,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


Many observed annual flood series exhibit reverse curvatures when plotted on lognormal probability paper. The occurrence of these curvatures may be attributed to storm and basin factors. A mixed distribution model is needed to analyze such flood series. A versatile flood frequency methodology has been developed which considers power normal, log-Pearson type III, and mixed distribution. Objective detection and modification of outliers/inliers is an integral part of this methodology.

Subject Headings: Flood frequency | Frequency distribution | Frequency analysis | Mathematical models | Detection methods | Curvature | Storms

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