Simulating Hydrology and Water Quality of a Claypan Soil Watershed (original) (raw)

2005, 2005 Tampa, FL July 17-20, 2005

The Soil and Water Assessment Tool (SWAT) model was the primary model selected for use in the Conservation Effects Assessment Project-Watershed Assessment Study (CEAP-WAS). In this paper, the performance of SWAT in simulating streamflow, sediment yield, and atrazine loss from Goodwater Creek, a 72 km 2 watershed located in the claypan soil region of north-central Missouri, was evaluated. When the model was run using default parameters, it overestimated average annual streamflow by 32%, underestimated average annual sediment yield by 23%, and overestimated average annual atrazine loss by 8%. The Nash-Sutctliff coefficient (E NS ) values were < 0.35 when annual estimated and measured values were compared. The model was calibrated for streamflow using data collected from 1992 through 1996. After calibration, the difference between measured and estimated average annual flow was < 5%, and the E NS values for annual and monthly simulation results were 0.90 and 0.85, respectively. After calibration, the model did not perform well 269-429-0300 (2950 Niles Road, St. Joseph, MI 49085-9659 USA).

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