Open source · Canadian open data

Anywhere in Canada, draw and run

Draw a boundary on the map and get a complete, ready-to-run EPA SWMM stormwater model — rainfall, terrain, land cover, soil, and the city's real storm and sanitary pipes, assembled from open data. No hunting across data portals, no manual setup.

Try the live beta Read the preprint

MIT licensed
EPA SWMM 5.2
8 real-network cities
Release v0.2.0

swmmcanada

› draw a boundary on the map
  · ECCC rainfall + design storms
  · 1 m LiDAR terrain where available
  · land cover · soil · city storm pipes
✓ model.inp ready · runs in EPA SWMM 5.2
✓ exports · MIKE+ · InfoWorks ICM

How it works

Draw, fetch, build

Draw

Draw (or upload) a boundary anywhere in Canada in the web app, pick your simulation dates, and click Build SWMM model.

Fetch

SWMMCanada pulls the Canadian open data for that spot — rainfall, terrain (1 m LiDAR where available), land cover, soil, ECCC design-storm intensities, and the city's storm and sanitary pipes.

Build

A complete, validated model.inp you can open and run in EPA SWMM 5.2 — plus a shareable datastore and export packages for MIKE+ and InfoWorks ICM.

The web app

A real city network, ready to download

The SWMMCanada web app after building downtown Victoria: real storm network and parcel-shaped subcatchments on the map, with the build mode and model layers in the side panel

Downtown Victoria after a build: the real storm network (blue), outfalls (red), and parcel-shaped subcatchments (green), with the model ready to download.

Two modes, picked automatically

Real networks in 8 cities, synthesized anywhere else

Real network

8 Canadian cities

Uses the city's published storm pipes — real inverts, diameters, manholes, and outfalls — in Victoria, Ottawa, Calgary, Surrey, London, Kitchener–Waterloo, Kelowna, and Regina. Where a city publishes parcels, subcatchments follow real lot lines; where it publishes a sanitary sewer, the model carries it as a second tagged system.

Synthesize

Anywhere else in Canada

Builds a realistic network from the street map and open data — DEM-delineated subcatchments where the terrain earns it, and pipes sized by the rational method with real ECCC IDF design-storm intensities.

The ecosystem

The first half of a closed modeling loop

SWMMCanada turns an area into a complete, runnable model. The second half, Agentic SWMM, takes that model the rest of the way — it runs EPA SWMM, calibrates against observations, post-processes, and quantifies uncertainty.

Downstream · runs your model

Agentic SWMM

Hand a SWMMCanada package to Agentic SWMM and the loop closes: open data → model → calibrated results with uncertainty. It does the downstream work through plain natural-language chat, and every step stays auditable and transparent.