Agricultural runoff modeling in a small west Tennessee watershed

The application of hydrological Simulation Pro gram in FORTRAN (HSPF) to agriculture runoff data was ex amined. An 18 hectare watershed planted in corn was secured along its perimeter and all runoff from the conventionally tilled field was directed to a single discharge structure equipped with an H-flume, continuous flow recorder, and automatic sampling equipment. Data on runoff, suspended solids, nitrogen forms, and atrazine over a 19-month period were used to develop a pre liminary calibration of the model. Simulation of runoff and sed iment was generally good, while simulation of atrazine and soluble nitrogen forms was fair. J. Water Pollut. Control Fed. 60, 242 (1988) Nonpoint agricultural pollution significantly affects water quality in 68% of all drainage basins in the U.S.1 It has been estimated that agricultural pollution contributes 60% of the (BOD) Biochemical Oxygen Demand, 64% of suspended solids (SS), and 76% of total phosphorus dis