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The United States Environmental Protection Agency 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. SWMM is one of the hydrology transport models which the EPA and other agencies have applied widely.

History SWMM was first developed in 1971 and has undergone several major upgrades since then. The major upgrades were: (1) Version 2 in 1975, (2) Version 3 in 1981 and (3) Version 4 in 1988. The current edition, Version 5, is a complete re-write of the previous Fortran release in C. Running under Windows, EPA SWMM 5 provides an integrated graphical environment for editing watershed input data, running hydrologic, hydraulic and water quality simulations, and viewing the results in a variety of graphical formats. These include color-coded thematic drainage area maps, time series graphs and tables, profile plots, scatter plots and statistical frequency analyses.

This latest re-write of EPA SWMM was produced by the Water Supply and Water Resources Division of the U.S. Environmental Protection Agency's National Risk Management Research Laboratory with assistance from the consulting firm of CDM, Inc.

Figure 1. SWMM 5's QA/QC Master Example Network. This one network includes examples 1 through 7 from the SWMM 3 and SWMM 4 Manuals

• DSSAM Model
• Hydrology
• Hydraulics
• Surface runoff

• EPA SWMM page
• SWMM Conversion Tools
• SWMM Tools