3.2.4. Digitizing Detailed Geometry as Drainage Channel

3.2.4.1. General

You can add a polygon to a wastewater structure just with drawing a simple line. The function creates a rectangle from the line with a width of 20cm. This is specially useful for manholes with function drainage channel.

3.2.4.2. Digitizing tool

Select the vw_tww_wastewater_structure layer
Use the Identify features tool on the object to which you want to add a drainage channel geometry
In the Feature Attributes window:go to the Action menu and choose Digitize Drainage Channel

or

Right click the object and select the vw_tww_wastewater_structure layer and the record
Choose Digitize Drainage Channel

../../_images/digitize_detail_geom_select1.jpg

You can now start digitizing: draw a simple line with two clicks.
The polygon with a width of 20 cm is created in the vw_wastewater_structure layer (layergroup Wastewater Structures)
In order to alter the width, press Ctrl during digitizing. After the second click, alter the width in the popup window.