Spatial and Temporal Variations of Precipitation Effects on Storm Hydrographsby Ed A. Toms, ATC Engineering Consultants Inc, United States,
Abstract: A partial area, variable source hydrologic rainfall runoff model, called MAPHYD, was developed utilizing digital maps, interactive computer graphics and several infiltration mechanisms. MAPHYD is an integrated set of computer programs useful for semi-automatic hydrologic model data management and application using digital maps. The model has both the capability of data management and hydrologic response components. Hydrologic simulations were conducted to study the effect the variable source model has on storm hydrographs. The effect of computational unit size on the accuracy of the storm hydrograph were studied. The impervious percentage of the watershed was studied by separating the amount of excess precipitation unit times were used to compute storm hydrographs and variations of their hydrologic values compared.
Subject Headings: Hydrologic models | Mapping | Storms | Hydrographs | Rainfall-runoff relationships | Computer models | Computer software | Hydrologic data
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