Appendix E. Credits and licences

StormSewer is GPL-3.0-or-later. Its engine is its own; its SWMM support rests on public-domain work by the U.S. Environmental Protection Agency and on the open-source projects below, which are credited here and not copied. This manual, the docs under docs/, is part of the software and carries the same licence.

EPA SWMM

The Storm Water Management Model, its engine, its Windows GUI, its manuals and its sample models are works of the United States Government and are in the public domain. StormSewer runs the stock engine unmodified, cites the manuals by section, redistributes the sample models unmodified as tutorial datasets, and reproduces no manual text.

Storm Water Management Model User's Manual Version 5.2, L. A. Rossman and M. A. Simon, EPA/600/R-22/030, 2022.
Storm Water Management Model Reference Manual Volume I — Hydrology (Revised), L. A. Rossman and W. C. Huber, EPA/600/R-15/162A, 2016.
Storm Water Management Model Reference Manual Volume II — Hydraulics, L. A. Rossman, EPA/600/R-17/111, 2017.
Storm Water Management Model Reference Manual Volume III — Water Quality, L. A. Rossman and W. C. Huber, EPA/600/R-16/093, 2016.
Storm Water Management Model Applications Manual, J. Gironás, L. A. Roesner and J. Davis, EPA/600/R-09/077, 2009 — the model the tutorials' shape follows.
Source: https://github.com/USEPA/Stormwater-Management-Model and https://github.com/USEPA/SWMM-GUI.

Other public sources

FHWA Urban Drainage Design Manual, Hydraulic Engineering Circular 22, 3rd edition, FHWA-NHI-10-009, 2009 (S. A. Brown, J. D. Schall, J. L. Morris, C. L. Doherty, S. M. Stein, J. C. Warner) — inlets, gutter flow, access-hole losses.
USDA-NRCS National Engineering Handbook Part 630, Chapter 4 — Storm Rainfall Depth and Distribution (210-630-H, 2019); NRCS TR-20 tabular rainfall distributions; NRCS TR-55 Urban Hydrology for Small Watersheds (1986) — the design-storm distributions and sheet-flow travel time.
WSDOT Highway Runoff Manual M 31-16.04, Appendix 4C (2014) — the 0.1-hour Type IA and II tables, used as a check.
NOAA Atlas 14 Point Precipitation Frequency Estimates (Hydrometeorological Design Studies Center) — the PFDS csv the storm and IDF importers read.
NOAA GHCN-Daily — the station csv the time-series importer reads.
Z. P. Kirpich (1940); FAA Airport Drainage AC 150/5320-5B (1970); C. J. Keifer and H. H. Chu, "Synthetic storm pattern for drainage design", J. Hydraulics Div. ASCE 83(4), 1957; V. T. Chow, D. R. Maidment and L. W. Mays, Applied Hydrology, 1988.

Open-source projects

Listed because StormSewer interoperates with them, learned from their issue trackers, or follows their conventions. No code from any of them is in StormSewer.

Project	Licence	Relation
OWA-SWMM	MIT	An alternate engine build that can be registered beside EPA's
pyswmm	BSD-2-Clause	Usable from the Python terminal; hotstart-at-time precedent
swmmio	MIT	Usable from the Python terminal; its model-summary idea
swmm_api	MIT	Its `.inp` coverage was a checklist for the schema
swmmtoolbox	BSD-3-Clause	A reference for reading the `.out`
openswmm.engine / openswmm.gui	MIT / GPL-3.0	Peer projects; their issue trackers informed the troubleshooting chapter
generate_swmm_inp (QGIS)	GPL-2.0	Its layer and column conventions are the ones to follow for GIS interchange; interop by format only
Giswater	GPL-3.0	A GIS-first SWMM workflow reference
GisToSWMM5	MIT	Subcatchment generation reference
swmmr	GPL-3	Calibration reference for the Python cookbook's future
SWMM5+	public domain	A possible future engine target
SWMManywhere	BSD-3-Clause	Synthetic network generation
OpenSWMM knowledge base	community posts	Threads cited in the troubleshooting chapter, paraphrased
swmm5.org (R. Dickinson)	author's copyright	Posts linked, not copied

StormSewer's own dependencies

The desktop app is built on egui/eframe (MIT or Apache-2.0), rfd, image, serde, serde_json, quick-xml, printpdf and, on Windows, windows-sys and Mesa's llvmpipe (MIT) for software rendering. SHA-256 is implemented in the tree (FIPS 180-4) so the engine-hash claim does not rest on a crate. The manual is built with pandoc (GPL) from Markdown.

Trademarks

Hydraflow and Autodesk are trademarks of Autodesk, Inc. StormSewer is an independent project, not affiliated with or endorsed by Autodesk, by CHI, or by the U.S. EPA.