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SWMM-OnLine.com website is dedicated to dissemination of information on  Storm Water Management Model (SWMM).    

SWMM Papers




Top 10 List

The following top ten lists were presented by Sam Shamsi at various International Conferences on Stormwater and Urban Water Systems Modeling held in Toronto, Canada. The lists are based on the responses provided by the members of the SWMM-USERS discussion group. This list has no technical or educational value; it's intended for entertainment only; and it is not intended to be offensive to anyone.

What is SWMM? 

 The EPA Storm Water Management Model (SWMM) is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas that receive precipitation and generate runoff and pollutant loads. The routing portion of SWMM transports this runoff through a system of pipes, channels, storage/treatment devices, pumps, and regulators. SWMM tracks the quantity and quality of runoff generated within each subcatchment, and the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period comprised of multiple time steps.

What is SWMM5? 

SWMM was first developed in 1971, and has since undergone several major upgrades since then. It continues to be widely used throughout the world for planning, analysis and design related to stormwater runoff, combined sewers, sanitary sewers, and other drainage systems in urban areas, with many applications in non-urban areas as well. The current edition, Version 5, is a complete re-write of the previous release. Running under Windows, SWMM 5 provides an integrated environment for editing study area input data, running hydrologic, hydraulic and water quality simulations, and viewing the results in a variety of formats. These include color-coded drainage area and conveyance system maps, time series graphs and tables, profile plots, and statistical frequency analyses.

Screen shot of the EPA SWMM 5  Graphical User Interface. Please Contact Lewis Rossman at rossman.lewis@epa.gov or (513) 569-7603 for a detailed description. Click on image for a larger view.

Typical Applications of SWMM

  • Design and sizing of drainage system components including detention facilities
  • Control of combined and sanitary sewer overflows (CSOs and SSOs)
  • Generating non-point source pollutant loadings for wasteload allocation studies
  • Flood plain mapping of natural channel systems
  • Evaluating Best Management Practice (BMP) and Low Impact Development (LID) options for sustainability goals and green infrastructure.

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