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ARS Home » Midwest Area » Columbia, Missouri » Cropping Systems and Water Quality Research » Research » Publications at this Location » Publication #62358


item Hjelmfelt Jr, Allen

Submitted to: Journal Hydrologic Engineering
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/11/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: Geographic Information Systems (GIS) are being used to create input data files for hydrologic models. In most cases, this consists of adapting the GIS to be used with a model designed for another input format. In this investigation, a runoff routing model was designed around the GIS. A grid based runoff model was developed around the inherent grid of a Digital Elevation Model (DEM), a type of GIS. This event-based model was planned for application to watersheds with flat topography. It was tested using the Goodwater Creek Watershed in Central Missouri with good results.

Technical Abstract: In this study, a physically based, distributed model was developed for routing overland flow across a watershed during a single storm event. The hydrograph was computed using a finite difference solution to the diffusion wave equations and infiltration was computed with the Green and Ampt equation. The effects of nonuniform rainfall and spatial variation of soil ltextures and land covers were included by subdividing a watershed into uniform cells. The geometric properties used in the distributed model were determined from a digital elevation model (DEM). The model performed well in a USDA research watershed located in central Missouri.