Graphical Verification of Flood Frequency Analysis

by Darde G. de Roulhac, Clark County Regional Flood Control, District, Las Vegas, United States,

Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H?AL)


In the analysis of flood frequency data, a proper distribution must be chosen to fit the data being analyzed. A properly applied distribution can minimize errors in the extrapolation of extreme events. A major drawback to mathematically fitting curves to flood data is that preselection of a statistical model is necessary. A model which is inappropriate for the specific watershed being analyzed may easily and unknowingly be chosen. Too often, a model is improperly applied or is selected solely because of its widespread use. To assist in the graphical verification, a computer program has been developed to generate graphical displays of observed data plotted on different probability 'papers,' and curves fitted to the data.

Subject Headings: Flood frequency | Data analysis | Hydrologic data | Graphic methods | Verification | Mathematical models | Frequency analysis

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