3.3.4. Connect Wastewater Network Elements

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

3.3.4.1. General

  • TWW 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_tww_reach layer has to be in edit mode

  • Click the Connect wastewater network elements button

  • If you move the mouse over a reach, that can be connected, it is marked (orange color): 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

../../_images/connecting_1.jpg

Note

the topology-layers are turned on in the screenshot to show the effect of the connection.

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

../../_images/connecting_2.jpg

Note

there is no options ‘Reach Point From’ in this example, because in a connection from reach to reach, it is not allowed to connect a From-reach point to another reach.

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

../../_images/connecting_3.jpg

  • To show the new connection, save your edits, click on the TWW-SQL-Button (refresh network topology) and refresh the screen. Now you can see the new connection in the topology-layers

../../_images/connecting_4.jpg

3.3.4.3. Video Tutorial (not adapted for TWW)

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_tww_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

Note

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 two reaches.