Urban Stormwater & Infrastructure

Storm and foul water drainage design and 1D hydraulic modelling software for UK and Irish civil engineers.

Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.

EPA's free tool for estimating site runoff reduction from green infrastructure, with climate scenarios.

EPA's toolbox for sanitary sewer overflow planning — RDII analysis with the SWMM engine underneath.

The public-domain engine of urban drainage: dynamic-wave pipe networks, runoff, LID and water quality.

Build and read EPA SWMM models as QGIS layers — free GIS-based SWMM model construction.

The US land-development standard for TR-55/TR-20 hydrographs and detention pond design.

Autodesk's integrated catchment model — the heavyweight for large sewer networks and coupled 2D flooding.

Browser-based urban stormwater and drainage modeling powered by OpenSWMM 6 compiled to WebAssembly.

eWater's stormwater-quality model — the WSUD assessment standard across Australian councils.

MATLAB (and Python/LabVIEW) co-simulation with SWMM — built for real-time control research.

CDM Smith's free rainfall statistics and STORM-method screening model — IDF analysis, disaggregation, CSO planning.

Bentley's sanitary and combined sewer modelling suite, integrated with CAD and GIS environments.

CHI's commercial GIS front-end for SWMM — the most direct productivity upgrade for serious SWMM users.

Python interface to the SWMM engine — step through simulations, read state, and control gates in real time.

Virginia DEQ's official Excel workbooks for stormwater compliance via the Runoff Reduction Method.

Free web tool for building synthetic design-storm patterns — 560+ temporal patterns, exportable to SWMM and HMS.

Benchmark scenarios for smart-stormwater control — test real-time control algorithms on curated SWMM systems.

Pure-Python reading, editing and running of SWMM INP, RPT and OUT files — the full file-format toolkit.

Pandas-powered reading, editing and version-diffing of SWMM models — the model-management side of the stack.

Run and read EPA SWMM from R — model execution, results import and GIS conversion on CRAN.

Python CLI and library for extracting time series from SWMM binary output files.