Evaluation of mixed-population flood-frequency analysis

Journal of Hydrologic Engineering



A mixed population of flood flows was shown to cause quality-of-fit problems if a single-population flood-frequency distribution was used to describe the flood data. The three populations in this mix were "ordinary," tropical cyclone, and ice-jam-release floods. Parametric descriptions of the single and separated flood populations were evaluated using probability-plot correlation-coefficient tests. These tests quantified how well the flood-probability distributions agreed with plotting-position descriptions of the data and quantified the differences due to the mixed-population analysis. High outliers caused the high skewness found in the single- population analyses. The tropical cyclone component was underestimated by single-population analyses at gauging stations in Massachusetts that had little data.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Evaluation of mixed-population flood-frequency analysis
Series title Journal of Hydrologic Engineering
DOI 10.1061/(ASCE)1084-0699(2001)6:1(62)
Volume 6
Issue 1
Year Published 2001
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Hydrologic Engineering
First page 62
Last page 70