OpenSWMM Manuals

The following manuals document the use, application, and technical reference for OpenSWMM, the next generation of the EPA Storm Water Management Model. These manuals build on the original EPA SWMM documentation, updated and extended for OpenSWMM.

See Authors & Contributors for the full list of authors and contributors.

User Manual (OpenSWMM User Manual)
Application Manual (OpenSWMM Application Manual)
Reference Manuals
- Hydrology Reference Manual (OpenSWMM Hydrology Reference Manual)
- Hydraulics Reference Manual (OpenSWMM Hydraulics Reference Manual)
- Quality Reference Manual (OpenSWMM Water Quality Reference Manual)
C API Reference
- The OpenSWMM Engine v6 C API is organized by domain into 19 public headers. See the Modules page for the full API reference generated from the include/openswmm/engine/ headers.
- Start with openswmm_engine.h for the engine lifecycle, then explore domain-specific headers such as openswmm_nodes.h, openswmm_links.h, and openswmm_model.h.
Changelog — see CHANGELOG.md for the complete list of changes in each release.