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 or tablet.
Sewer work in your pocket, even with no signal.
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 sewer modeling toolkit, with or without signal
Import, edit, simulate and visualize sanitary and storm sewer networks on your device — and, when you want it, see them over a map.
Open .inp and .hydrosewer files
Import the EPA SWMM 5 file format and save your work in 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.
Map background
See the network over Google Maps, find where it goes in one tap, and see where you are — optional, turned on by you, and the only feature that uses the internet.
Core features without internet
Model, simulate, save and take notes with no connection. No account and no server behind the app.
Field notes & photos
Close the loop between the model and what is actually in the ground — free and unlimited.
Reports, export & saved projects
Hand your work on as files, and get back to yesterday’s project in one tap.
Privacy by design
Works without signal. Your models stay on the device.
HydroSewer is built for the field and for confidentiality. Modeling, simulation, saving and field notes run locally — including the EPA SWMM 5 engine itself. Only the optional map background uses the internet.
No account, no cloud
Nothing to sign up for and no server behind the app. The simulation runs on the device, with or without signal.
No analytics
HydroSewer has no analytics, telemetry or crash reporting of its own. The optional map comes from Google, under Google’s privacy policy.
Your data stays local
Models, notes, photos and results stay 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 or tablet, so a dead spot with no signal doesn’t stop the model.
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 sewer pipes. Works 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 your sewer models in your pocket
Available now on the App Store and Google Play — model sewer and stormwater networks with or without signal, wherever the work takes you.
iPhone & iPad
Android
Version 1.12.0