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MS-DOS |
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v3.12 |
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Feb. 1998 |
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Yes |
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USEPA |
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PRZM is a one-dimensional, finite-difference model that accounts
for pesticide and nitrogen fate in the crop root zone.
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PRZM3 is the most recent version of a modeling system that
links two subordinate models--PRZM and VADOFT--in order
to predict pesticide transport and transformation down
through the crop root and unsaturated zone.
PRZM-3 includes modeling capabilities for such phenomena as soil
temperature simulation, volatilization and vapor phase transport
in soils, irrigation simulation, microbial transformation, and
a method of characteristics (MOC) algorithm to eliminate
numerical dispersion.
PRZM is capable of simulating transport and transformation of
the parent compound and as many as two daughter species. VADOFT
is a one-dimensional, finite-element code that solves the Richard's
equation for flow in the unsaturated zone. The user may make use
of constitutive relationships between pressure, water content,
and hydraulic conductivity to solve the flow equations.
VADOFT may also simulate the fate of two parent and two daughter
products. The PRZM and VADOFT codes are linked together with
the aid of a flexible execution supervisor that allows the user
to build loading models that are tailored to site-specific situations.
In order to perform probability-based exposure assessments, the
code is also equipped with a Monte Carlo pre- and post-processor.
Enhancements to Release 3.0 include algorithms that enable modeling
of nitrogen cycle soil kinetic processes with the ability to track
nitrogen discharges from a septic tank into the soil environment
and movement to groundwater. Additional enhancements enable better
simulation of physicochemical processes, increased flexibility in
representing agronomic practices, and improved post-processing and
data interpretation aids.
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| File |
Size |
Download |
| PRZM3 program and user manaual |
5.38MB |
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| PRZM3 installation image and data set, zipped
-- Use this if you have a difficulty with EPA's
installation program |
1.25MB |
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| PRZM3 Documents |
2.64MB |
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| PRZM3 FORTRAN source codes |
228KB |
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| [Archive] PRZM2 program and user manaual |
2.76 MB |
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