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Water Models

About Water Models

Scientists in the Office of Pesticide Programs (OPP) in the Environmental Protection Agency (EPA) frequently use simulation models to predict pesticide concentrations in surface and ground water for use in both human health and aquatic ecological exposure assessments. Listed below are links to executable versions of each of the models currently in use, plus links to the documentation for these models.

Surface Water

PRZM, EXAMS, PRZM/EXAMS SHELL, KABAM, FIRST, GENEEC2, Tier I Rice Model, PFAM

Ground Water

SCI-GROW, PRZM-GW

More Useful Links


PRZM (Pesticide Root Zone Model)

PRZM is a surface water model that simulates chemical movement in soil within and immediately below the plant root zone. PRZM is often linked with EXAMS to develop refined exposure assessments of pesticide concentrations in aquatic environments.


EXAMS (Exposure Analysis Modeling System)

EXAMS is a surface water model that evaluates the fate, transport, and exposure concentration of pesticides. EXAMS is frequently linked with PRZM to develop refined exposure assessments of pesticide concentrations in aquatic environments.


PRZM/EXAMS SHELL

PE Version 5.0

Approved Model Suite

KABAM Version 1.0 (Kow (based) Aquatic BioAccumulation Model)

KABAM is used to estimate potential bioaccumulation of hydrophobic organic pesticides in freshwater aquatic food webs and subsequent risks to mammals and birds via consumption of contaminated aquatic prey.


FIRST (FQPA Index Reservoir Screening Tool)

FIRST is a surface water model that is used to assess exposure to pesticides in drinking water.

FIRST Version 1.0

FIRST Models

FIRST Version 1.1.1


GENEEC2 (GENeric Estimated Environmental Concentration)

GENEEC is a surface water model that is used to assess exposure of pesticides to aquatic organisms and the environment.


Tier I Rice Model

Tier I Rice Model is an aquatic model used to estimate surface water exposure from the use of pesticides in rice paddies.


PFAM (Pesticides in Flooded Application Model)

PFAM is an aquatic model used to estimate surface water exposure from the use of pesticides in flooded fields. In comparison to the current Tier 1 rice model, PFAM allows for more advanced evaluation of pesticide use on flooded agricultural areas such as rice paddies and cranberry bogs. The advanced capabilities of PFAM include accounting for water and pest management practices and for degradation in soil and aquatic environments, as well as for post processing of discharged paddy waters to a stream, index reservoir, farm pond, or other user-defined receiving water.


SCI-GROW (Screening Concentration In GROund Water)

SCIGROW is an aquatic model used to estimate pesticide concentrations in ground water.


PRZM-GW


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