# Compare Flow

> Hydraulic flow capacity calculator for non-pressure sewer pipes using Manning's Formula. (iPhone/iPad app by iENGINEERING Corporation.)

- Source: https://appshunter.io/ios/app/compare-flow/id581217854 (this page in markdown: same URL + `.md`)
- Developer: [iENGINEERING Corporation](https://appshunter.io/developer/419618955)
- Category: Productivity, Utilities
- Price: Free
- Rating: 4.60/5 from 5 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 23 MB
- Languages: English
- Released: 2012-11-30
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/compare-flow/id581217854/reviews.md

## What is Compare Flow?

Compare Flow app uses Manning's Formula, the most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers.

In order to evaluate possible alternatives in either pipe geometry or material, use this app to compare the hydraulic flow capacity among various concrete pipes including circular, elliptical, arch and box sections with circular thermoplastic and corrugated metal pipes.

## Key features

- Manning's Formula calculation
- Compare hydraulic flow capacity
- Evaluate pipe geometry alternatives
- Compare pipe material options
- Supports concrete, thermoplastic, and metal pipes
- Circular, elliptical, arch, and box sections

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/compare-flow/id581217854/reviews.md

### 5/5 — Handy for Compare Flow Comparison

*2018-02-11*

Excellent app for hydraulic capacity calculations and quick comparisons between flow capacities of pipes with different shapes, materials, and diameters.

### 3/5 — Update Already

*2017-04-19*

The app works for calculating. Please update to work on IOS 10. It crashes every time I try to type a decimal and the keyboard covers whatever I'm typing.

## Frequently asked questions about Compare Flow

### What is Compare Flow used for?

Compare Flow is used to calculate and compare the hydraulic flow capacity of various non-pressure sewer pipes. It utilizes Manning's Formula to evaluate different pipe geometries and materials.

### What pipe types can Compare Flow analyze?

Compare Flow can analyze circular, elliptical, arch, and box sections for concrete pipes, as well as circular thermoplastic and corrugated metal pipes.

### Is Compare Flow free to use?

Yes, Compare Flow is available for free. It does not have any in-app purchases or advertisements.

### What devices does Compare Flow support?

Compare Flow is supported on iPhone, iPad, and iPod devices.

### How often is Compare Flow updated?

The latest version of Compare Flow is 3.0.1, and it was last updated on October 9, 2025. This indicates regular updates for the application.

### What is the age rating for Compare Flow?

Compare Flow has an age rating of 4+, making it suitable for a wide range of users.

### Does Compare Flow have ads?

No, Compare Flow does not contain advertisements. It is an ad-free application.

### What formula does Compare Flow use for calculations?

Compare Flow uses Manning's Formula, which is the most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers.

## Version history (last 5 releases)

### 3.0.1 — 2025-10-09

UI improvements for better usability. 
Added the option to enter custom dimensions for circular and box pipes.

### 2.0.0 — 2018-02-09

This app has been updated by Apple to display the Apple Watch app icon.

Compatibility upgrade for iPhone X and iOS 11.

### 1.0.2 — 2013-07-28

Enhanced flow capacities comparison UI.

### 1.0.1 — 2012-12-06

Implemented some UI enhancements and calculation fixes.

### 1.0.0 — 2012-11-29

No release notes.

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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 2026-06-01.*