# Stormweir: Runoff Lab — Runoff, channels and storage

> Runoff, channels and storage (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/stormweir-runoff-lab/id6792826802 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Productivity
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 88 MB
- Released: 2026-07-30
- Data updated: 2026-08-12
- User reviews in markdown: https://appshunter.io/ios/app/stormweir-runoff-lab/id6792826802/reviews.md

## What is Stormweir?

Stormweir: Runoff Lab is a focused, fully on-device app. Civil stormwater workbench for Rational Method runoff, NRCS curve-number screening, detention routing, orifice/weir discharge, Manning channels, and storm scenarios.

KEY FEATURES
- Rational and curve-number screens
- Editable inflow/outflow routing
- Orifice and storage metrics
- Site-photo evidence
- Editable sample data and CSV import
- Side-by-side scenario comparison
- Local PDF evidence export
- Fifty-three original offline reference plates

ONE-TIME AND PRIVATE
- One paid download; no subscription or in-app purchase
- No account, advertising, analytics, tracking, or developer-operated backend
- Core features and bundled content work offline
- Work remains on device unless you deliberately share or export it through an Apple system interface

Hydraulic estimates are planning aids and do not predict flood safety. Verify survey data, rainfall criteria, local regulations, tailwater, blockage, and professional design review.


## Version history (last 1 release)

### 1.0 — 2026-07-30

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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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 2026-08-12.*