1. General Model Information

Name: Storm Water Management Model

Acronym: SWMM

Main medium: terrestrial
Main subject: hydrology, biogeochemistry
Organization level: Landscape
Type of model: not specified
Main application:
Keywords: urban runoff, pollutants, storm, natural drainage, rainfall, snowmelt


Model Distribution Coordinator
Center for Exposure Assessment Modeling
U.S. Environmental Protection Agency
960 College Station Road
Athens, Georgia 30605-2720
Phone: (706) 355-8400
Homepage: http://www.epa.gov/ceampubl/ceamhome.htm



The United States Environmental Protection Agencies (USEPA's) Storm Water Management Model (SWMM) is a comprehensive computer model for analysis of quantity and quality problems associated with urban runoff. Both single-event and continuous simulation can be performed on catchments having storm sewers, or combined sewers and natural drainage, for prediction of flows, stages and pollutant concentrations. Extran Block solves complete dynamic flow routing equations (St. Venant equations) for accurate simulation of backwater, looped connections, surcharging, and pressure flow.

Modeler can simulate all aspects of the urban hydrologic and quality cycles, including rainfall, snowmelt, surface and subsurface runoff, flow routing through drainage network, storage and treatment. Statistical analyses can be performed on long-term precipitation data and on output from continuous simulation. SWMM can be used for planning and design. Planning mode is used for an overall assessment of urban runoff problem or proposed abatement options.

Source of abstract:
Computational Hydraulics Int. (CHI) SWMM pages: http://www.chi.on.ca/swmm.html

SWMM is a dynamic rainfall-runoff simulation model, primarily but not exclusively for urban areas, for single-event or long-term (continuous) simulation. Flow routing is performed for surface and sub-surface conveyance and groundwater systems, including the option of fully dynamic hydraulic routing in the Extran Block. Nonpoint source runoff quality and routing may also be simulated, as well as storage, treatment and other best management practices (BMPs). Version 4.3 (May 1994) contains corrections and enhancements to Version 4.20 (June 1992), including a new Transport flow divider, revised hydraulic radius calculations for natural channels in Extran and Transport (to agree with the HEC-2 method), multiple land use options in Runoff, additional sewer infiltration options, improved manipulation of long-term rainfall data (especially 15-min data), a linkage to WASP4 from Transport, additional statistical output from Runoff and many other corrections and enhancements to various program options. Version 4.4 contains many more improvements and options and modifications.  Version 4.4 is the recommended version for all users.

The executable program and the Fortran code may be downloaded from this Web site (see later instructions), and this is the recommendation in order to have the most recent code changes.  The 1994 version 4.3 is also available from the EPA CEAM.  The OSU code and EPA CEAM code is DOS-based and runs in a window under Windows 95/98/NT/2000.  Although it will run under DOS with a 486 processor, a Pentium is recommended.  Program storage requires about 5 Mb of hard disk space. Also included with the OSU and EPA releases is the Fortran source code,  program documentation (but not the users manuals), and several sample input files. See this and the EPA CEAM Web site for details.

State-of-the-art graphical user interfaces are available from third-party venders listed later in this Web site.  Most of these GUIs are constructed around the core Fortran code of the OSU model version.

Source of abstract:
Oregon State Civil Engineering SWMM page: http://www.ccee.orst.edu/swmm/

II. Technical Information

II.1 Executables:

Operating System(s): Windows 3.1 or higher

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Huber, W.C. and R.E. Dickinson 1988 "Storm Water Management Model (SWMM), Version 4, User's Manual," EPA/600/3-88/001a. NTIS accession no. PB88 236 641.
Roesner, R.A., Aldrich, J.A. and R.E. Dickinson 1988 "Storm Water Management Model (SWMM), Version 4, User's Manual Part B, EXTRAN Addendum," EPA/600/3-88/001b NTIS accession no. PB88 236 658.
Huber, W.C. Heaney, J.P. and B.A. Cunningham, 1985 "Storm Water Management Model (SWMM) Bibliography," EPA/600/3-85/077. NTIS accession no. PB86 136 041.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: J. Bierwirth : 2.03.2001 -
Status of the document:
last modified by Joachim Benz Sun May 16 12:21:01 CEST 2004

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