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Application of SWAT and APEX models for Upper Maquoketa River Watershed in Northeast Iowa

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032063,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13766) @2003
Authors:   A. Saleh, P.W. Gassman, J. Abraham, J. Rodecap
Keywords:   watershed model, nutrients, flow, GIS

The watershed-scale SWAT (Soil and Water Assessment Tool) and field-scale APEX (Agricultural Policy/Environmental eXtender) models were used to estimate flow and nitrate N (NO3-N) loads within the Upper Maquoketa River Watershed (UMRW). The UMRW is highly impacted by swine, cattle, and dairy operations. A GIS interface was used to generate much of the required data for the models. Simulation of manure applications at the field-scale was performed using APEX. The predicted flow and NO3-N loading from the manure application fields were then input into SWAT as direct point sources. The predicted flow and NO3-N loading obtained from SWAT were compared with measured flow and NO3-N data from four monitoring sites within the UMRW. Considering the size and variation of land use, land cover, geology, and soils within the UMRW, the predicted flow and NO3-N loading by SWAT fell reasonably well within the range of measured values.

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