Envisys is happy to announce the release of iDrawlix SMALL PRO. The FIRST #sewer #design #APP was finally born on #Apple Mac App Store following thes link.
With the size SMALL the User is allowed to design and verify a single culvert, channel or sewer in the following list of cross sections: 
- Circular;
- Egg shaped – Old England Style;
- Egg shaped – Modern Style;
- Horseshoe;
- Arch;
- Box;
- Box with a triangular bottom;
- Box with a circular bottom;
- Trapezoidal;
- Compound trapezoidal.
PRO licence of iDrawlix SMALL provides the User with full access to all features:
- Catalogue of cross section handling;
- Logo and User Info Reports customization;
- No licence expiration.
iDrawlix APPs Playground allows Users approaching design and verification of partially full conduits or open channels flow problems to immediately experiment what happens to their project at any change in the settings, without the burden of building complicate ad hoc models to get graphics and tables of it.
iDrawlix SMALL PRO allows the User to consider both Dry and Wet weather discharge rate at the same time, always verifying that minimum and maximum velocity limits are observed.
At any input change, the APP updates the cross sectional areas engaged by Wet and Dry weather discharge. For the Wet weather discharge, the longitudinal water surface profile, in gradually varied flow regime hypothesis, is drawn. 
The User can set the level of the current downstream (profiles M1 and M2 in subcritical or streaming conditions) or upstream (profiles S2 and S3 in supercritical or torrential flow). While the User modifies the boundary conditions, a table summarising the integration steps of the longitudinal water surface profile is always accessible.
iDrawlix SMALL PRO displays the Stage-Discharge graphics, plotting the following variables:
- Discharge in normal conditions;
- Cross sectional area in normal conditions;
- Hydraulic Radius in normal conditions;
- Wetted Perimeter in normal conditions;
- Velocity in normal conditions;
- Velocity in critical conditions.
Along with the drawn ones, iDrawlix SMALL PRO display an useful table of variables which includes other calculated parameters, e.g. those referring to the first and second order moments (to help the User solving the hydraulic jump), total energy and all the main geometric and hydraulic parameters, both in normal and critical conditions of the flow.
Printing all the above-mentioned graphics and table represents the output of the APP. Choosing size and orientation of the printer paper, as well as generating PDFs to preview the printed output, are granted by the Mac OS X environment.
On website Users can find all the useful support documentations (pdfs of User Manual, Quick Start and Tutorial).
Here is available the User Manual of iDrawlix SMALL in iBooks.