Hydrologic and Atrazine Simulation of the Cedar Creek Watershed Using the SWAT Model

One of the major factors contributing to surface water contamina-tion in agricultural areas is the use of pesticides. The Soil and Water Assessment Tool (SWAT) is a hydrologic model capable of simulat-ing the fate and transport of pesticides in an agricultural watershed. The SWAT model was used in this study to estimate stream flow and atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine) losses to surface water in the Cedar Creek Watershed (CCW) within the St. Joseph River Basin in northeastern Indiana. Model calibration and validation periods consisted of five and two year periods, respec-tively. The National Agricultural Statistics Survey (NASS) 2001 land cover classification and the Soil Survey Geographic (SSURGO) data-base were used as model input data layers. Data from the St. Joseph River Watershed Initiative and the Soil and Water Conservation Dis-tricts of Allen, Dekalb, and Noble counties were used to represen