Effect of GIS data quality on small watershed stream flow and sediment simulations

Simulations of total runoff and fine sediment yield in Goodwin Creek watershed, which covers 21·3 km2 in Mississippi, were carried out using a hydrological model‐GIS system. The system includes the recently released Soil and Water Assessment Tool (SWAT) model version 2000 and AVSWAT version 1·0, the supporting interface with ArcView GIS. Among the required GIS input, some are commonly available in the United States with multiple options and characteristics. In our study, two available digital elevation models, three land use–land cover maps and two soil maps were grouped in all possible ways to obtain 12 applied input combinations.

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