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Screening Models
The models listed here are screening models that are usually applied before the
refined air quality model to determine if refined modeling is needed.
The models in this section include
AERSCREEN,
COMPLEX1,
CTSCREEN,
RTDM3.2,
SCREEN3,
TSCREEN,
VALLEY, and
VISCREEN.
| Screening Models |
AERSCREEN
AERSCREEN is the screening model for
AERMOD. The model will produce estimates of
regulatory design concentrations without the need for meteorological data and is designed
to produce concentration that are equal to or greater than the estimates produced by
AERMOD with
a fully developed set of meteorological and terrain data.
Model Code and Documentation
EPA is currently working on a beta version of the code that will be released to the public as soon as possible.
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COMPLEX1
COMPLEX1 is a multiple point source screening technique with terrain
adjustment that incorporates the plume impaction algorithm of the
VALLEY
model.
Model Code
Executable (129KB,ZIP)
Model Documentation
User's Guide is presently not available
Latest Model Change Bulletin
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CTSCREEN
CTSCREEN is a Gaussian plume
dispersion model designed as a screening technique for regulatory
application to plume impaction assessments in complex terrain.
CTSCREEN is a screening version of the
CTDMPLUS model.
Model Code
Readme/Executable/Test Case and Source Code (710KB,ZIP) with Extended Memory Executable
Model Documentation
User's Guide 
Supplement to User's Guide
Report on Modifications to CTSCREEN and CTDMPLUS
Notes on Terrain Input to CTDMPLUS and CTSCREEN (10KB,TXT)
Latest Model Change Bulletin
Model Tutorial
Tutorial Documentation (155K,ZIP/WP5.1)
Instructions for CTSCREEN Tutorial (3K,TXT)
CTSCREEN Demonstration (420K,ZIP)
CTSCREEN Model, File 1 (305K,ZIP)
CTSCREEN Model, File 2 (329K,ZIP)
Text editor file (48K,ZIP)
Terrain data file (77K,ZIP)
BUCKBERG Terrain data file (3K,TXT)
ORIG Terrain data file (3K,TXT)
CTDM Batch file (23,TXT)
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RTDM3.2
Rough Terrain Diffusion Model (RTDM3.2) is a sequential
Gaussian plume model designed to estimate ground-level concentrations in
rough (or flat) terrain in the vicinity of one or more co-located point
sources.
Model Code
Executable (106KB,ZIP)
Model Documentation
User's Guide is currently not available
Latest Model Change Bulletin
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SCREEN3
SCREEN3 is a single source Gaussian plume model which provides
maximum ground-level concentrations for point, area, flare, and volume
sources, as well as concentrations in the cavity zone, and
concentrations due to inversion break-up and shoreline fumigation.
SCREEN3 is a screening version of the
ISC3 model.
Model Code
Readme/Code/Executable (176KB,ZIP)
Model Documentation
User's Guide
Latest Model Change Bulletin
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TSCREEN
Toxics Screening Model (TSCREEN) is a Gaussian model that
implements the procedures to correctly analyze toxic emissions and their
subsequent dispersion from one of many different types of possible
releases for superfund sites. It contains 3 models:
SCREEN3, PUFF, and RVD (Relief Valve Discharge).
Model Code
Code/Executable/Test Case (1.6MB,ZIP)
Model Documentation
User's Guide
TSCREEN Workbooks
Latest Model Change Bulletin
Model Tutorial
Tutorial Documentation (86K,ZIP/WP5.1)
Instructions for TSCREEN Tutorial(2K,TXT)
TSCREEN Demonstration (579K,ZIP)
TSCREEN Model, File 1 (253K,ZIP)
TSCREEN Model, File 2 (382K,ZIP)
TSCREEN Model, File 3 (568K,ZIP)
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VALLEY
VALLEY is
a steady-state, complex terrain, univariate Gaussian plume dispersion
algorithm designed for estimating either 24-hour or annual
concentrations resulting from emissions from up to 50 (total) point and
area sources.
Model Code
Code (76KB,ZIP)
Model Documentation
User's Guide is available from NTIS.
Latest Model Change Bulletin
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VISCREEN
VISCREEN calculates the potential impact of a plume of specified
emissions for specific transport and dispersion conditions.
Model Code
Executable (121KB,ZIP)
Model Documentation
Users Guide available from NTIS
User's Guide Update Pages
Latest Model Change Bulletin
Model Tutorial
Tutorial Documentation (486K,ZIP/WP5.1)
Instructions for VISCREEN Tutorial (2K,TXT)
VISCREEN Demonstration (1058K,ZIP)
VISCREEN Model (71K,ZIP)
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