Partial Area, Variable Source, Rainfall Runoff Model Utilizing Digital Mapping

by Ed A. Toms, Engineering Consultants Inc, United States,
Lynn E. Johnson, Engineering Consultants Inc, United States,

Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance


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 suite of computer programs useful for (semi)automatic hydrologic model data management and application using digital maps. Hydrologic simulations were conducted to study the effect the variable source model has on the storm hydrographs. The effects 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 generated on pervious and impervious areas. Varying computational unit times were used to compute storm hydrographs and variations of their hydrologic values compared.

Subject Headings: Hydrologic models | Computer models | Mapping | Rainfall-runoff relationships | Runoff | Hydrographs | Storms | Hydrologic data

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