ITM-SWMM is a fork of the public domain U.S. EPA Storm Water Management Model (SWMM) that includes the Illinois Transient Model (ITM) as an optional flow routing method. SWMM is a distributed rainfall-runoff-routing ... simulation model designed for both single-event and long-term (continuous) simulations of runoff quantity and quality, primarily in urban areas. For more details on SWMM, visit this link. ITM is a finite-volume, shock-capturing model used to simulate the dynamics of rapidly filling and draining sewer systems. For more information on ITM, visit this link.

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ITM-SWMM is a free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 1 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

The ITM-SWMM model is applicable to various hydraulic and sewer system analyses, including:

• Evaluating the impact of gate closures on transient flow formation in combined sewer systems
• Assessing the potential for surge formation
• Modeling hydraulic transients involving simultaneous free-surface and pressurized flows in closed-conduit systems
• Analyzing filling conditions in combined sewer systems, from dry-bed flows to free-surface flows, transitioning to partially free-surface and partially pressurized flows, and ultimately to fully pressurized flows
• Simulating catchments and collector systems

The ITM-SWMM model is being used for the transient and non-transient analysis of various combined sewer systems in the United States. Below is an incomplete list of users:

• Sam Glovick (sglovick@WadeTrim.com), Wade Trim, Pittsburgh, Pennsylvania.

(*) The flow routing DLL in ITM-SWMM is identical to that in ITM. As a result, ITM-SWMM and ITM share the same version number.

The ITM-SWMM model will be posted soon in GitHub. The code will be hosted at this Github link

The hourly rate for ITM-SWMM technical support or any type of consultation is $300. To request support, please email artuleon@gmail.com with a description of the issue. You will receive a response with an estimated quote within 24 hours.