epa-swmm

1,729 OWA SWMM5 test models covering LID, routing, and user networks. Built during the February 2026 Fixathon.

Anywhere in Canada, draw and run. Built from Canadian open data, with real municipal storm networks (35 cities) or synthesized anywhere.

The SWMM4 User's Manual (Huber, Dickinson, Barnwell, Branch, 1988) converted to Markdown. 850+ citations. Now searchable and forkable

Full-stack browser workbench for EPA SWMM5: in-browser WASM simulation, .inp editing/validation, result visualization, RPT analysis, batch runs, and diffs.

EPA SWMM 4.4H Fortran source. Wayne Huber's 2004 reference build, preserved for the historical record.

Turn any SWMM5 .inp file into a plain-English narrative. Deterministic parser + structured-output LLM. Starter repo.

Browsable catalog of proposed new features and enhancements for the EPA SWMM5 engine.

Robert Dickinson's 50+ years of stormwater modeling in one repo: EPA SWMM5 engine enhancements (e.g. two-layer infiltration), a WebAssembly build of the SWMM5 engine for the browser, interactive educational apps, and automation scripts (Ruby for InfoWorks ICM, Python for PySWMM).

Urban stormwater drainage network modelling and sensitivity analysis using EPA SWMM and Python

HTML5 batch engine runner for EPA SWMM4 models, recreating the original CDM_SWMM app.

swmmx: A Unified Python Toolkit for Building, Editing, Running, Importing, Visualizing, and Exporting EPA SWMM Models

Browser-based SWMM5 workspace pairing a TypeScript/Vite UI with a native C engine to load, run, and manage .inp models.