# Storm Drain Pipe Sizer — Storm Drain Pipe Sizing

> Storm Drain Pipe Sizing (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/storm-drain-pipe-sizer/id6761743252 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $1.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-04-08
- Data updated: 2026-08-04
- User reviews in markdown: https://appshunter.io/ios/app/storm-drain-pipe-sizer/id6761743252/reviews.md

## What is Storm Drain Pipe Sizer?

Need to size a storm drain pipe but tired of flipping through design manuals? This calculator does the hydraulics for you in seconds.

Enter rainfall intensity, drainage area, runoff coefficient, pipe slope, and material to get the exact pipe diameter your project needs. No more guessing between standard sizes.

WHAT YOU GET:
- Peak runoff flow (Q) via the Rational Method
- Required pipe diameter from Manning equation
- Nearest standard pipe size recommendation
- Full-pipe flow velocity and capacity check
- Self-cleansing velocity verification

SURFACE TYPES:
Rooftop, concrete, gravel, flat lawn, steep lawn, and forest — each with standard runoff coefficients built in.

PIPE MATERIALS:
Concrete, PVC, corrugated metal, and HDPE with accurate Manning roughness values.

STANDARD SIZES:
Recommends from 4-inch through 60-inch standard pipe diameters.

Works completely offline. No account required. Built for civil engineers, stormwater designers, and site contractors who need fast, reliable pipe sizing on the job.

## Chart rankings

- #192 in Top Paid · Utilities (US App Store)


## Version history (last 3 releases)

### 1.0.3 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.0.2 — 2026-04-14

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-08

No release notes.

## More apps by Shanghai Sheyuan Network Technology Co., Ltd.

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- [Orifice Jet Flow](https://appshunter.io/ios/app/orifice-jet-flow/id6760607248)
- [Concrete Block Wall Est](https://appshunter.io/ios/app/concrete-block-wall-est/id6760607814)

All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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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 2026-08-04.*