The Pesticide Flooded Application Model (PFAM) is used by the USEPA to estimate pesticide concentrations in surface water from the use of pesticides in flooded fields, such as rice paddies. PFAM simulates water and pest management practices, pesticide degradation in soil and aquatic environments, as well as discharge of paddy waters to lotic or lentic user defined waterbodies. Conceptual models for drinking water were developed for rice grown in California and Arkansas in 2016. A case study on estimating drinking water concentrations based on applications of benzobicyclon on rice will be presented. Modeling was completed simulating concentrations of parent and a major degradate of concern using formation and decline degradation kinetics and modeling routines. Considerations on flow through assumptions and application of a production cap will be discussed.

Case study on estimating potential human health pesticide concentrations in drinking water from the use of benzobicyclon on rice in California

254th National Meeting (2017)

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