A New Method for Synthesizing a Six Hour Unit Hydrograph

by William H. Salesky, US Army Engineer District at, Pittsburgh, Pittsburgh, PA, USA,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


A new methodology was devised that would use readily available basin physical parameters for the determination of unit graphs in undeveloped and ungaged areas. Rather than using small regional analyses, this analysis was performed for the entire State of Ohio. Existing unit hydrographs for gaged basins throughout the State were used to derive regression equations for various components of the unit hydrograph. These components consist of the peak flow, the time of peak and a newly developed component, the width in hours of the unit hydrograph at one-half of the peak flow. The width component provides two additional points for use in shaping the unit hydrograph. From the results of the regressions, the high correlations indicated that this method would produce unit graphs with a high degree of confidence.

Subject Headings: Hydrographs | Basins | Regional analysis | Flow duration | Peak flow | Regression analysis | Parameters (statistics) | Correlation | Ohio | United States

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