App: iDrawlix 2k18
Developer: Studio Envisys
Genres: Grafik und Design, Produktivität

MODEL:
The Sewer Network Model is based on Manhole collections. Conduits are linear elements which connect Manholes. Pumps, Inflows and CSOs are considered as special Manholes. Drainage Areas are modeled as geometric surfaces connected to the downstream Manholes of each Conduit. Users can interactively define the Network Longitudinal Layout, fine tuning Crowns, Inverts and Slopes.
Spatial Model: through Georeferenced Bitmaps and World files. 
Digital Elevation Model: iDrawlix® 2k18 can build the Spatial Model DEM, starting from a set of 3D Points or importing it directly in the ARC/INFO ASCII GRID file format. Starting from the DEM, iDrawlix® 2k18 can build the Slope spatial distribution.
iDrawlix® 2k18 can build and handle Land Use Maps in order to define and describe the spatial distribution of the Runoff coefficients. Import/Export in the ARC/INFO ASCII GRID file format is fully supported.
Rain Model: iDrawlix® 2k18  provides a variety of method to choose the Intensity Duration Frequencies (IDFs): 2 parameters, hyperbolic 3 parameters, ASCE 3 parameters and directly the precipitations of the Deutscher Wetterdienst. Users are allowed to set the desired Return Period in order to test the Sewer Network.
Sanitary Model: Sanitary Unit Loads are model-defined through key-forecasting parameters derived from prestigious academic literature. For each Drainage Area, Users are allowed to specify single load sources (example: inhabitants per housing, pupil per primary schools, wash machine per laundries).
Storm and Sanitary Water Quality: iDrawlix® 2k18 can calculate the mean event concentration and mass balances of pollutants for each knot of the Sewer Network. Users are allowed to set, for each main Storm Pollutant, the Unit Load per impervious unit area drained per year that meanly contributes to pollute the wastewater carried downstream by the Sewer Network. In the same way, iDrawlix® 2k18 refers to the equivalent household concept in order to forecast, for each sanitary run, the mean concentration and the mass balance for each pollutant examined, for each knot of the Sewer Network.
CAPABILITIES:
Full Playground Catalogue Support (minor versions iDrawlix® SMALL): Users can make the APP choose the best fitting Cross Section of the Current Catalogue loaded. Users, conversely, can decide to "Lock" a specific Cross Section linked to a certain Conduit of the Sewer Network (e.g. Testing an existing Network). 
Network Engine: The network engine solver is based on the well-known ASCE Rational Method and its local derivations such as the Italian "Corrivazione" and the German Standard DWA-A 118.
IN APP PURCHASES:
Within iDrawlix® 2k18, it is possible to subscribe the following In App Purchases (capabilities shown at: https://www.idrawlix.com/in-app-purchase):
- SMALL EDU Pack;
- SMALL PRO Pack;
- MEDIUM Pack;
- LARGE Pack;
- LARGE Square Pack;
- LARGE Cube Pack.
All the above In App Purchases are delivered within two kind of subscriptions: Annual and Monthly, both auto-renewable. 
The Payment (directly to Apple iTunes, not ENVISYS) for each In App Purchase will be charged to iTunes Account at confirmation of purchase.
Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
The iTunes User Account will be charged (directly by Apple iTunes, not ENVISYS) for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal.
Subscriptions may be managed by the User on the iTunes User's Account page and auto-renewal may be turned off by going to the User's Account Settings after purchase.
Any unused portion of a free trial period (one month), offered for the first time just within the Annual Large Cube Pack in App Purchase, will be forfeited (directly by Apple iTunes, not ENVISYS) when the user purchases a subscription to that publication.
Visit: https://www.idrawlix.com/eula and read the End User License Agreement.

Release notes:
The current release includes the improvements of 2.0 version and additional bug fixing:
- Now iDrawlix® 2k18 is FREE for ALL with the new ONE MONTH FREE TRIAL.
Enjoy #theArtOfSewering with the ONE MONTH FREE TRIAL within the Annual Large Cube Pack Subscription. Cancel Your Subscription 24 hours before Your renewal date so that Apple inc. will not charge You. Otherwise, let Your Subscription renew and enjoy the most cost effective Sewer Design APP.
-Improved LONGITUDINAL LAYOUT DEFINING.
Faster Longitudinal Layout defining, with the new Button ALLIGN CROWNS: Select the current Conduit in Your Longitudinal Profile window and choose to align Your branch with the upstream or downstream one, in just a button click!
- Enhanced Sewer CATALOGUES' Browser.
Within the new version of iDrawlix® 2k18, browsing Your current Sewer Catalogue will be as easy as browsing a digital book! You can now faster and easier select Your Cross Section in order to test Your Sewer or Channel into the funny Playground window.
- GDPR Compliance and iDrawlix® Subscriptions.
Customer Trust is our absolute top priority. The EU Regulation 2016/679, known as GDPR (General Data Protection Regulation), is now a worldwide Best Practice of major industries. ENVISYS Environmental Engineering, owner of the iDrawlix® trademark, effort to conforms since May, 24th 2018 to the GDPR in order to grant his Customers an improved Privacy Policy and to enhance the fundamental Right to Access and Right to be Forgotten.
- Free Tech SUPPORT for Your actual Sewer Network Design.
With the iDrawlix® Website Subscription, You will have full access to the Help On Line features of iDrawlix® 2k18. If You are a Registered User and a regular subscriber of the Annual Large Cube Pack In App Purchase, furthermore, You will be allowed to receive FREE TECH SUPPORT for ONE Actual Design a Year by our Hydraulics Engineering Department.
- Bug fixing.