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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
Ground Water
More Useful Links
- Exposure Modeling Public Meeting - Information
- Input Parameter Guidance
- Positive Attributes and Desired Qualities for Models
- Regional PCA for Drinking Water Assessment
- Golf Course Adjustment Factors
- Relevant SAP Sessions
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.
- Executable
- Source Code
- Documentation
- EXAMS Environments examsenv.zip (1kb)
PRZM/EXAMS SHELL
PE Version 4.01
Approved Model Suite
- PE Version 4.01
(August 13, 2003) - PRZM v3.12beta
(May 24, 2001) - EXAMS v2.98.04
(July 18, 2002)
Executable
- Script pe4v01.pl (91 kb)
- Crop Scenarios
- Meteorological Files
Documentation
PE Version 5.0
Approved Model Suite
- PE Version 5.0
(November 15, 2006) - PRZM v3.12.2
(May 12, 2005) - EXAMS v2.98.04.06
(April 25, 2005)
Executable
- Script pe5.pl (109 kb)
- Crop Scenarios
- Meteorological Files
Documentation
- PE 5.0 User's Manual | Microsoft® Office Word Version (8 pp, 88 KB)
- Standard Crop Scenario Metadata
- Nonstandard Crop Scenario Metadata
- Barton Springs Salamander
- Red Legged Frog
- organophosphate | WordPerfect® Version (91 pp, 506 KB)
- n-methyl carbamate | WordPerfect® Version (70 pp, 381 KB)
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.
- Executable kabam_v1_0.xls (158 kb)
- Users Manual | PDF Version (123 pp, 871KB, About PDF)
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
- Executable first.exe (73 kb)
- Source Code (Fortran 77) first.for (45 kb)
- Description
- Users Manual
FIRST Models
FIRST Version 1.1.1
- Executable firstv1_1_1.exe (576 kb)
- Source Code (Fortran 77) first_version1_1_1.for (46 kb)
- Description | Microsoft® Office Word Version (9 pp, 67 KB)
- Users Manual | Microsoft® Office Word Version (13 pp, 101 KB)
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.
- Executable geneec2.exe (80 kb)
- Source Code (Fortran 77) geneec2.for (60 kb)
- Description
- Users Manual
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.
- Documentation | PDF Version (14 pp, 222KB, About PDF)
SCI-GROW (Screening Concentration In GROund Water)
SCIGROW is an aquatic model used to estimate pesticide concentrations in ground water.
- Executable sg23.exe (336 kb)
- Source Code (Fortran 90) scigrow.f90 (5 kb)
- Description
- User's Manual for Version 2.3 is under development