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A Mathematical Model for Estimating Pesticide Losses in Runoff¹

ABSTRACT

A simple mathematical model has been proposed for the estimation of losses of dissolved and solid-phase pesticide in cropland runoff. The model is designed for use in water quality and pesticide screening studies for which field pesticide runoff data are unavailable. Hence, the model is based on commonly used methods for runoff and soil loss predictions and does not require calibration. A comparison of model predictions with measured atrazine (2-chloro-4 (ethylamino)-6-(isopropylamino)-s-triazine) losses from two small Georgia watersheds has indicated that the model provides a reasonable means of estimating the approximate magnitudes of long-term (3-years for the two watersheds) total pesticide runoff losses. Although large errors were sometimes observed in estimates of losses from single runoff events, the observed variations in pesticide losses among events and the distribution of these losses into dissolved and solid-phase components were reflected in model predictions.

Key Words: water quality • nonpoint source pollution • atrazine

¹ Contribution from the Dep. of Agric. Eng., Cornell Univ., Ithaca, NY 14853. Cornell Univ. is an equal opportunity, affirmative action educator.

² Associate Professor of Agricultural Engineering and Environmental Engineering.

Received for publication June 16, 1979.