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A Model for Runoff of Pesticides from Small Upland Watersheds¹

ABSTRACT

A mathematical model has been developed describing the rate and quantity of runoff water from separate rainfall events on a watershed and the rate and quantity of sediment and pesticides transported. The runoff water is calculated by convolving an area-characteristic and variable state function to produce a variable response function which is then convolved with a computed effective rain. Rill and interrill erosion are conceptually distinguished which allows similar partitioning of associated pesticides. The sediment contribution from interrill erosion is a function of rainfall intensity and soil susceptibility to erosion. The rill erosion is a function of water runoff and the rate of change of water runoff. The concentrations of pesticides in the runoff are functions of the amount of runoff, the sediment concentrations derived from rill and interrill erosion, and the pesticide concentrations in the respective runoff-erosion zones.

Experience with the model in simulating the water, sediment, and pesticide runoff from an upland Piedmont plain watershed for four summer storms is related. Excellent simulations were obtained.

Key Words: erosion • sediment • water quality

¹ Contribution from Southern Region, Agricultural Research Service, USDA, in cooperation with the Univ. of Georgia Agric. Exp. Sta. The data used to quantify model parameters were generated from a cooperative agreement [EPA-1AG-0024(R), dated 4 June 1971] between Environmental Protection Agency's SE Environ. Res. Lab., Athens, GA 30601, and the USDA-ARS Southern Piedmont Conserv. Res. Center, Watkinsville, GA 30677.

² Supervisory Soil Scientist, Soil Scientist, Supervisory Soil Scientist, USDA, Watkinsville, Ga.; Hydraulic Engineer, USDA, Athens, Ga.; and Agricultural Engineer, USDA, Watkinsville, Ga.; respectively. This is an alphabetic listing and not intended as a ranking of scientific contribution.

Received for publication February 10, 1975.

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