# iDrawlix Mobile — Hydraulics? iDrawlix!

> Hydraulic design and verification for open channels and sewers. (iPhone/iPad app by Studio Envisys.)

- Source: https://appshunter.io/ios/app/idrawlix-mobile/id1439486128 (this page in markdown: same URL + `.md`)
- Developer: [Studio Envisys](https://appshunter.io/developer/1279076741)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 1.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.2 · 6 MB
- Languages: American English
- Released: 2020-05-11
- Data updated: 2026-07-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/idrawlix-mobile/id1439486128/reviews.md

## What is iDrawlix Mobile?

iDrawlix® Mobile comes as free App, with two In App Purchases options which will unlock Watermarks and file sharing, respectively.
It replaces iDrawlix® Premium, for which we will do not grant our assistance starting June, 30 2021, because his not full compatibility with iOS 13 or newer. It has been, fully  recompiled in native Swift also for Mac OS. Now it is newer, faster and graphically more beautiful. 
iDrawlix® can handle a single Sewer or Open Channel, basing on the Playground concept. The iDrawlix® Playground concept allows Users approaching design and verification of partially full conduits or open channels to immediately experiment what happens to their project at any change in the settings, without the burden of building complex ad hoc models in order to get graphics and tables out of it.
We chosen to provide iDrawlix® Mobile with the "Top Seven" types of cross section:
- Open Channels:
  -Simple Trapezoidal;
- Closed Channels/Sewers:
  -Rectangular,
  -Rectangular with Triangular Bottom,
  -Circular,
  -Egg-Shaped (old England Style),
  -Standard Egg-Shaped,
  -Elliptical.
User can select four different Hydraulics Calculation Models:
- Gauckler & Strickler,
- Chezy-Bazin,
- Chezy-Kutter and
- Manning.
Two different options of System Unit are available:
- International System (IS) or
- Imperial Units (IU).
Each Cross Section, furthermore, can be characterised by two Roughness Coefficients: one for the bottom and one the edges (sides).
All the necessary geometric parameters, are anyway explained graphically by the legend and the quotes next to the cross section represented within the Activity.
iDrawlix® Mobile displays in real time, at any parameter change:
- Normal Flow Depth and
- Normal Flow Discharge.
One of the main output of iDrawlix® Mobile is the Stage-Discharge curve of the current Cross Section. ​
Each Parameter is plotted in the classic dimensionless scale vs. the ratio Yn/H, where:
- Yn is the normal depth;
- H is the maximum internal depth of the given Cross Section.
In the bottom View, are tabled the following parameters, for each Y, assumed as normal depth Yn:
- σn, as the Hydraulic Cross Section involved (m²) or (ft²),
- HRn, as the Hydraulic Radius (m) or (ft),
- χn, as the corresponding Wet Perimeter (m) or (ft),
- Qn, as the normal Discharge (m³/s) or (ft³/s),
- Vn, as the normal Velocity (m/s) or (ft/s),
- Vc, velocity in critical conditions (m/s) or (ft/s),
- Fr, that is the Froud number (n).
iDrawlix® Mobile can represent also the HGL (Hydraulic Grade Line) for a given free surface channel or sewer, which is plotted under hypothesis of gradually varied flow. 
Users can consider Channels or Sewers of semidefinite length in the Mild Slope as well as in the Steep Slope case. Boundary conditions are set interactively by the User, imposing the known depth into the starting downstream cross section (profiles known as M1 and M2) for Mild Slope Channels or, in the opposite case, by imposing the known depth into the starting upstream cross section (profiles known as S2 and S3) for Steep Slope Channels.
​All the parameters computed within the integration used in order to plot the HGL graph, are represented also in the tabular format as follows:
- Y(i) depth of the current. Dimensions: (m) or (ft);
- X(i) abscissa corresponding to Y(i), computed as negative for upstream wise case (mild slope) and positive for downstream wise integrations (steep slope). Dimensions: (m) or (ft);
- V(i) velocity of the current in the cross section i. Dimensions: (m/s) or (ft/s);
- J(i) energy loss or gain between the i-th and the i+1-th cross section. Dimensions: (m/m) or (ft/ft);
- E(i) energy computed as sum of the hydraulic grade and velocity head. Dimensions: (m) or (ft).
We strongly recommend to buy the "Full unlock forever" In App Purchase in order to get the max from your iDrawlix® Mobile experience. Old Premium version owners are kindly requested to email to idrawlix@idrawlix.com in order to get a new free license.

## Key features

- Playground concept for real-time experimentation
- Seven cross-section types
- Four hydraulic calculation models
- International and Imperial unit systems
- Real-time normal flow depth and discharge display
- Stage-Discharge curve generation
- Hydraulic Grade Line (HGL) representation

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full unlock forever. | $5.99 | one-time |
| Watermarks unlock forever. | $2.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/idrawlix-mobile/id1439486128/reviews.md

### 5/5 — Fantastica!

*2021-03-27, version 2.0*

Quest'app consente di progettare nella maniera più semplice e precisa!! L'ho scaricata dall'app store dell'iphone e posso utilizzarla allo stesso modo anche sul mio mac! Comodissima. Complimenti!

### 5/5 — Ottima applicazione ed assistenza

*2021-03-17, version 1.0.3*

Sono molto contento di avere scaricato questa applicazione. Era proprio ciò di cui avevo bisogno. ho contattato l’assistenza tramite il sito per una delucidazione e mi hanno risposto, credo, in neanche 20 minuti e sono stati particolarmente attenti a verificare di avermi soddisfatto.

### 5/5 — Best app

*2020-05-26, version 1.0.3*

Una app davvero utile, pratica e versatile. Difficile trovare app tecniche come questa. Consigliatissima per i malati di idraulica

### 5/5 — Straordinaria!

*2020-05-16, version 1.0.3*

App eccellente nel suo campo , una delle migliori,  se non la migliore , perfetta in tutto , completa in ogni dettaglio... complimenti !

## Frequently asked questions about iDrawlix Mobile

### What is iDrawlix Mobile used for?

iDrawlix Mobile is used for designing and verifying partially full conduits and open channels. It allows users to experiment with different settings and immediately see the impact on their project, including flow depth and discharge.

### What types of cross-sections does iDrawlix Mobile support?

iDrawlix Mobile supports seven types of cross-sections, including Simple Trapezoidal for open channels, and Rectangular, Rectangular with Triangular Bottom, Circular, Egg-Shaped, Standard Egg-Shaped, and Elliptical for closed channels/sewers.

### Which hydraulic calculation models are available in iDrawlix Mobile?

Users can choose from four different hydraulic calculation models: Gauckler & Strickler, Chezy-Bazin, Chezy-Kutter, and Manning.

### Does iDrawlix Mobile offer different unit systems?

Yes, iDrawlix Mobile provides two options for system units: the International System (IS) and Imperial Units (IU).

### What kind of outputs can I expect from iDrawlix Mobile?

iDrawlix Mobile displays real-time normal flow depth and discharge. It also generates Stage-Discharge curves and can represent the Hydraulic Grade Line (HGL) for given channels or sewers.

### What are the in-app purchases for iDrawlix Mobile?

iDrawlix Mobile offers two in-app purchase options. These unlock Watermarks and file sharing functionalities, respectively.

### On which devices can I use iDrawlix Mobile?

iDrawlix Mobile is available for Mac, iPhone, and iPad, indicating broad compatibility across Apple's ecosystem.

### How often is iDrawlix Mobile updated?

The latest version of iDrawlix Mobile is 2.0.1, and it was last updated on January 8, 2024, suggesting regular maintenance and updates.

## Version history (last 4 releases)

### 2.0.1 — 2024-01-08

Compiled for iOS 17.
Some reported bugs have been fixed.

### 2.0 — 2021-03-23

compatibility with iOS 14 improved 
iOS 14 sharing plotting and tables on iPad bugs solved.

### 1.0.3 — 2020-05-15

fixed the accessing to the offered In-App-Purchases.
iPad keyboard handling improved.

### 1.0 — 2020-05-12

No release notes.

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## More apps by Studio Envisys

- [MarateApp](https://appshunter.io/ios/app/marateapp/id1469676328)
- [Chartarium](https://appshunter.io/ios/app/chartarium/id1564625172)

All apps by Studio Envisys: https://appshunter.io/developer/1279076741

## Related topics

[idrawlix mobile](https://appshunter.io/ios/topics/idrawlix-mobile)

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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 2026-07-07.*