EXPOSURE MODELING

Regulatory Modeling

Regulatory Modeling

Kathy Alborado

Chamber Policy Committee Co-Chair

CEO, Helios HR
Chamber Policy Committee

Accurate simulations lead to

Understanding potential contamination

From the organisms that live in our oceans and seas, to the ground we walk on and the air we breathe, our world is an intricate environment that is protected by regulations to ensure a future for generations to come. Modeling can be used to understand the potential for contamination in each of these environments (water, ground, and air) and the possible concentration that may be found in space and time.

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Do you have questions about our Exposure Modeling work?

Contact Waterborne's Global Exposure Modeling lead, Amy Ritter, at rittera@waterborne-env.com.

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Our Regulatory Modeling Work


Since US Environmental Protection Agency (USEPA) regulations and guidelines are ever-evolving, our modelers stay current on the changes as well as maintain excellent working relationships with regulators. By understanding the limitations in existing procedures, it allows us to recommend more accurate and refined data for registration and reregistration. The distribution, sale, and use of crop protection chemicals in the United States is governed by the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and regulated by the USEPA. We are experts in exposure modeling used in the FIFRA framework, such as PWC (PRZM-VVWM), AgDrift, TerrPlant, PAT, T-REX, BeeRex and T-Herps.

Our modelers have extensive experience with the use of EU regulatory models such as FOCUS Surface Water (SWASH), FOCUS Groundwater (PELMO, PEARL, and PRZM) in support of registration submissions for Regulation (EC) No. 1107/2009. Using GIS and remote sensing, our modelers are pioneers in landscape- based exposure assessments for higher-tier exposure analysis, which have been successful in both Annex I and Annex III inclusions.  

Waterborne’s experience in being able to understand and model the fate and transport of chemicals in surface water provides reliable estimates of potential exposure.  Regulatory models for surface water such as VVWM, EXAMS, AGRO, TOXSWA are utilized to best represent these environmental conditions.

In some cases, small amounts of crop protection products applied to soil or crops may volatilize into the atmosphere over time. Models such as PERFUM and SCREEN3 can be used to assess this, whereas the STIR presents a screening-level model representing vapor and droplet phase exposure to mammals and birds. Waterborne is also experienced in performing field-based studies to examine the potential for volatilization using meteorological and air sampling instrumentation.

The potential for deposition of pesticides during application (ground spray, air blast or aerial) is often modeled using data generated from field trials. Models such as AgDrift, AgDISP, RegDisp and FOCUS SWASH Drift Calculator, incorporate spray drift trial data to develop regressions predicting deposition based on distance with specific equipment and meteorological conditions.