# HydroSewer - Drainage Network — Stormwater & Sewer Analysis

> Stormwater & Sewer Analysis (iPhone/iPad app by Transparent Blue Water LLC.)

- Source: https://appshunter.io/ios/app/hydrosewer-drainage-network/id6754671899 (this page in markdown: same URL + `.md`)
- Developer: [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 24 MB
- Languages: American English
- Released: 2026-04-10
- Data updated: 2026-08-21
- User reviews in markdown: https://appshunter.io/ios/app/hydrosewer-drainage-network/id6754671899/reviews.md

## What is HydroSewer?

HydroSewer is a professional stormwater and sewer network analysis tool powered by the EPA SWMM 5.2 engine. Design, analyze, and simulate drainage networks directly from your iPhone or iPad.

KEY FEATURES

- Import and export EPA SWMM input files (.inp) for full compatibility with existing workflows
- Run hydraulic simulations using the real EPA SWMM 5.2 engine - no cloud required, everything runs on-device
- Visualize your drainage network with an interactive map: zoom, pan, and select elements
- Step through simulation results over time to see how your network performs under storm conditions
- Inspect and edit node, link, and subcatchment properties
- View real-time computed values: water depth at nodes, flow rate in conduits, velocity, and more

FIELD NOTES

- Tap any manhole, outfall, or pipe and attach a note, with photos, tied to that exact element
- Flag as-built discrepancies, log observations, or leave a "check this" for the office
- Mark notes open or resolved; every element with an open note is highlighted on the map
- See all your open notes in one project-wide list and jump straight to each element
- Notes and photos are saved in your project and never touch the .inp file

FREE, WITH NO LIMITS

Model networks of any size and add unlimited field notes and photos, free, forever. HydroSewer Pro is an optional one-time purchase that adds a shareable PDF report of your open field notes, for handing off to your team or client. Everything else stays free.

BUILT FOR ENGINEERS

HydroSewer brings the power of EPA SWMM to your mobile device. Whether you are in the office reviewing a design or in the field verifying a network, you can load any standard .inp file and run a full dynamic simulation instantly.

Supported elements include junctions, outfalls, conduits, pumps, weirs, orifices, subcatchments, and rain gages.

ABOUT EPA SWMM

EPA SWMM (Storm Water Management Model) is the industry-standard software developed by the U.S. Environmental Protection Agency for planning, analysis, and design of stormwater runoff, combined and sanitary sewers, and other drainage systems.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HydroSewer Pro | $14.99 | one-time |



## Version history (last 4 releases)

### 1.10.1 — 2026-07-25

Field Notes. Add notes and photos to any manhole, outfall, or pipe, right in the field. Free and unlimited.

### 1.10.0 — 2026-07-22

- **Notes on network elements.** Add text notes to junctions, outfalls, storage, dividers and pipes. Mark each one Open or Resolved.
- **Photos on notes.** Attach photos from the camera or your gallery. Duplicates are stored only once to keep your file small.
- **See them on the map.** Elements that have notes get an amber ring on the canvas, so you can spot annotated assets at a glance. Turn on Notes Mode to tap an element and jump straight to its notes.
- **One list of everything pending.** Open Field Notes from the menu to see every open note across the project, newest first, and tap to go to its element.
- **Share a PDF report.** Export a one-tap PDF of all open notes and send it by email, WhatsApp or print.
- **Saved Projects.** Reopen a recent project in a single tap — no file picker — and see which one is the latest.
- **Name your project when you save.** Save asks for a name (defaulting to the project name) and warns you before overwriting an existing one.

- **HydroSewer Pro.** Unlimited field notes and the PDF report are part of HydroSewer Pro — a one-time purchase, no subscription, no account, no internet. The free tier includes 10 notes per project, and every modeling feature stays free, forever.

### Improved
- **Native project files are now a package.** A `.hydrosewer` file now bundles your model, your notes and your photos together — still a single file to share.

### Fixed
- Re-running a saved project no longer fails with "ERROR 191" when the original `.inp` used dash-separated dates (e.g. `1-1-2000`) in `[OPTIONS]`.

### 1.9.0 — 2026-07-03

Reliability and accuracy update.

  • Simulations now run in the background, so the app stays responsive.
  • Safer saving with atomic writes — and Save now works on mobile.
  • More faithful SWMM .inp export (precision, offsets, subcatchment data).
  • Number entry accepts comma or period decimals (locale-aware).
  • Mass-continuity error shown after each run, so you can judge how reliable the results are.

### 1.0 — 2026-04-10

No release notes.

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## More apps by Transparent Blue Water LLC

- [HydroCalc Plus](https://appshunter.io/ios/app/hydrocalc-plus/id578807688)
- [HydroCalc Basic](https://appshunter.io/ios/app/hydrocalc-basic/id6752577110)
- [FlowAnalyzer - Water Network](https://appshunter.io/ios/app/flowanalyzer-water-network/id6754671981)
- [Pipe Hydraulic Network Viewer](https://appshunter.io/ios/app/pipe-hydraulic-network-viewer/id6754879365)
- [NPSH Calculator](https://appshunter.io/ios/app/npsh-calculator/id6756281499)

All apps by Transparent Blue Water LLC: https://appshunter.io/developer/1847968351

## Related topics

[metropolitan sewer district](https://appshunter.io/ios/topics/metropolitan-sewer-district)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*