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Problem Statement:
The United States Environmental Protection Agency (US
EPA) is mandated to assess risk from pesticides. Exposure models are used as part of
the regulatory process that can estimate tiered screening-level
concentrations in drinking water. Advances are needed in several areas in
regard to the exposure models’ simulation capacities, with this work
focused on improving routines for directly connected macropores, kinetic
sorption, and pesticide treated seeds.
This research is a collaborative effort between Oklahoma State
University, the USDA-ARS (Fort Collins, CO and Ames, IA)
and Bayer CropScience. Our
research includes both one-dimensional and three-dimensional numerical
modeling along with laboratory experiments of flow and transport in
macropores.
More recently, our research has also included developing empirical
relationships for predicting pesticide trapping efficiency of vegetative
filter strips. Our empirical relationships are not dependent on physical
characteristics of the buffer (i.e., slope, width, area ratio, etc.), but
rather on the hydrologic response of the filter strip.
AIM
Workshop Presentation – Brussels, Belgium (October 22, 2008)
Specific accomplishments include the development and
laboratory verification of a macropore/subsurface drainage express fraction
that accounts for macropores directly connected to subsurface drainage and
the evaluation of pesticide fate and transport models for pesticide treated
seeds.
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