Storm Water Management Model (SWMM) - 5.0.018

Unlimited pipes version | Released: 11/18/09

Download installation program
Download users manual
Download source code files
Download programmer's toolkit (DLL libraries)

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.

Technical support

There is no formal support offered for EPA SWMM by USEPA, but you can register on the Be Communities water forums hosted by Bentley to find quick answers to your SWMM modeling questions.

CivilStorm - V8i Edition

10-link version | Updated: 1/5/10

Download installation program (licensed by Bentley)
Installation instructions
Learn more about CivilStorm

Developed by Haestad Methods, Inc. in 2004, CivilStorm is the easiest-to-use fully dynamic stormwater systems modeling package in the industry. Recognized all over the world for its ease of use and convenient scenario management features, CivilStorm includes powerful analysis necessary for verification of hydraulic capacity and demonstrating stormwater compliance in complex storm water handling systems, in a modern stand-alone GIS-type interface.

CivilStorm allows you to choose to run the industry-standard EPA-SWMM engine or CivilStorm's implicit solution.

With Bentley’s acquisition of Haestad Methods in 2004, you can also choose to run CivilStorm within MicroStation. CivilStorm can also be run within AutoCAD as a paid option.