Model the network
HydroSewer
Powered by the EPA SWMM 5 engine, running on your deviceImport .inp files, edit sanitary and storm sewer networks, and run the simulation right on your phone.
Sewer work in your pocket. 100% offline.
Two tools for sanitary and storm sewers: one models the network, the other sizes the pipe.
Size the pipe
Sewer Pipe Calculator
The other half of the job: sizing. Diameter, slope, velocity and depth with Manning, and a gravity collector laid out segment by segment. No network model, no simulation engine.
See everything it does →Import & simulate
Open your model and run it — for real
HydroSewer reads standard EPA SWMM 5 .inp files and runs the actual SWMM 5 engine on-device in a background isolate. No re-implementation, no approximation.
- Import .inp and native .hydrosewer files
- Parses all standard SWMM sections
- Pre-simulation validation catches missing outfalls and isolated nodes
Results
See depth, flow and flooding at a glance
Color-coded nodes and links, flooded nodes highlighted, and a timeline you can scrub through every simulation timestep.
- Nodes colored by depth: blue → green → orange → red
- Links colored by flow capacity
- Interactive timeline with a color legend
Field notes
The model goes to the field with you
Drop a note on any manhole, outfall or pipe, snap photos to back it up, and mark it resolved once it is handled. Notes live in your project file — they never touch the .inp.
- Notes on junctions, outfalls, storage, dividers and pipes, each Open or Resolved
- Photos from the camera or gallery, stored once even if reused
- Annotated elements get an amber ring on the canvas, and one list shows every open note
Everything it does
A complete SWMM 5 toolkit, offline
Import, edit, simulate and visualize sanitary and storm sewer networks — entirely on your device.
Import & export .inp
Full round-trip with the EPA SWMM 5 file format and a native project format.
The real SWMM 5 engine, on-device
The actual EPA SWMM 5 computational engine runs locally via FFI — no server, no cloud.
Network editing & creation
Build and modify sanitary and storm sewer networks directly on the canvas.
Interactive network canvas
Zoom, pan and inspect every element — including subcatchments, unique to SWMM.
Simulation results
Read hydraulic results for every node, link and subcatchment across all timesteps.
Results visualization
Color-coded maps and a scrubbable timeline make results easy to read in the field.
Units, both systems
US Customary and Metric, detected from your model and applied everywhere.
100% offline & private
The release build ships with no internet permission — your models never leave the device.
Field notes & photos
Close the loop between the model and what is actually in the ground — free and unlimited.
Reports & saved projects
Turn open notes into a document, and get back to yesterday’s project in one tap.
Privacy by design
100% offline. Your models never leave the device.
HydroSewer is built for the field and for confidentiality. Everything runs locally — including the EPA SWMM 5 engine itself.
No internet permission
The release build requests no internet permission at all — it physically cannot phone home.
No data collection
No analytics, no telemetry, no crash reporting and no account. Nothing about you is tracked.
Your data stays local
Networks, models and results live in local files on your device. Sharing is always your call.
Who it's for
Made for the engineers who run the pipes
From manhole inspections in the field to storm sewer design at the desk — SWMM 5 wherever you are.
Field inspector
Open the model at the manhole, not back at the office. The whole engine runs on the phone, so a dead spot with no signal changes nothing.
Sewer network designer
Import an .inp, edit nodes, conduits and pumps with live validation, and re-run the real SWMM 5 engine as often as the design changes.
Stormwater engineer
Subcatchments with Horton, Green-Ampt or Curve Number infiltration, then flooded nodes and depth colored on the map, timestep by timestep.
Also from Transparent Blue Water
Sewer Pipe Calculator
Manning calculations for a single pipe — free, instant, offline.
Before you model a whole network, you size a pipe. Sewer Pipe Calculator solves the everyday Manning problems — velocity and depth, diameter from flow, minimum slope — in SI or US units, with no connection and no account.
- Six free calculators: velocity & depth, diameter from flow, slope range, minimum slope & diameter, flow & velocity, flow analysis
- Tractive force τ reported alongside velocity, flagged against the minimum
- SI and US units on every screen, switchable mid-calculation
- Standard pipe catalog: it rounds up to the next commercial size for you
- Pro modules for collector design, pump stations, siphons, weirs, orifices, minor losses and force mains
Put SWMM 5 in your pocket
Available now on the App Store and Google Play — model sewer and stormwater networks offline, wherever the work takes you.
iOS
Android
macOS
Version 1.10.1