3.3.4. Connect Wastewater Network Elements

This represents a guide on how to connect wastewater network elements in QGEP.

3.3.4.1. General

QGEP has a tool to connect wastewater network elements

../../_images/connect_wastewater_network_elements_button1.jpg

3.3.4.2. How to connect reaches to nodes or reaches to reaches

It does not matter, which layer is selected
The vw_qgep_reach layer has to be in edit mode
Click the Connect wastewater network elements button
If you move the mouse over an reach, that can be connected, it is marked: you can click
Move the mouse to the network element, to which the first object will be connected (again: selectable objects get marked) and click again

A window appears, where you can choose, which connection will be defined. If you connect a reach, the window looks like this:

If everything is ok, you will see a message in a blue bar on top of the map-window

3.3.4.3. Video Tutorial

See this video tutorial (QGIS version 2):

3.3.4.4. How to delete a connection

There is no special tool in the moment to delete a connection between network elements.

Select the vw_qgep_reach layer and set it to edit mode
Click on the Identify Features button and select the reach to modify by double clicking
Delete the value in the rp_…_fk_wastewater_networkelement field to delete the connection

../../_images/connecting_delete_connection.jpg

Nota

Be aware of the “VSA Erfassungsgrundsätze”: A reach point from (rp_from_fk_wastewater_networkelement) should never be connected to another reach.

For example, when you have a reach discharging directly into another one without a structure between the two, the upstream reach should be connected to the downstream reach (rp_from_fk_wastewater_networkelement = downstream reach). But inversely, the downstream reach shouldn’t be connected to the upstream one. This rule is for swwf-channels (secondary network). In pwwf-network, there must be always a node between to reaches.