Creating new demand objects

Step-by-step Guide

In modeling water supply systems, demand analysis ensures the correct amount of water is available to specific areas within a supply network. In InfoWorks WS Pro, adding new nodes and objects to existing models simulates demand needs for future developments. An example is adding a new network representing a future housing development to an existing pipe within a network.

First, create a new scenario:

1. Copy Session 5.wspt into your Database.
2. From the Model Group window, drag-and-drop BridgeNet into the workspace to open the GeoPlan.
3. Click Create scenario.
4. In the Create New Scenario dialog box, enter the name “Housing Development”.
5. Click OK.

Next, locate an existing pipe to which to link a new network:

6. From the Operations toolbar, select Find Network Objects.
7. In the Network Find dialog, under Match Identifier, select Asset.
8. From the object list, select Links.
9. In the Wildcard field, enter the asset ID for the pipe, “169656”.
10. Under Matched Objects, select “169656”.
11. Click Select and find.

12. Close the Network Find dialog.

Notice in the GeoPlan, the view is zoomed into the location of the pipe, which is highlighted in red.

Note: To ensure the model is accurate, it is essential to allocate demand to nodes throughout the network.

To create a node for the new demand:

13. In the Tools toolbar, expand the Object category drop-down and select Node.
14. Click New object.

15. In the GeoPlan, click a spot south of the highlighted pipe.
16. In the Create new node dialog box, ID field, enter the name “Development”.
17. Click OK.

To link the new node to the existing pipe:

18. Expand the Object category drop-down and select Link.
19. Click New object.

Note: Because this is a simulation of a planned pipe, the connection link should be identifiable from the existing network, so in this example, a zig-zag line will be used to represent the link.

20. In the GeoPlan, draw a zig-zag link connecting a node from a node on the previously selected pipe to the newly created node.
21. In the Create New Link dialog box, select OK to confirm.

Note: Because this new pipe is a simulation, the properties of the pipe are somewhat arbitrary.

22. From the Pipe Object Properties pane, under Shape, in the Length field, enter “1”.
23. In the Diameter field, enter “200”.
24. Set the Friction coefficient, or CW - k to “0.01”.

To configure the properties of the newly created node, such as setting the elevation, which is needed for the model to run. Again, because this is a simulation and there is no known elevation, you can use existing elevation values from a previously existing node.

25. From the toolbar, select Properties.
26. In the GeoPlan, select the node from the existing pipe.

27. From the Properties pane, under Location, copy the value from the Elevation

28. In the GeoPlan, select the new node.
29. In the Node Object Properties panel, under Location, paste the value into the Elevation field of the new node.

Adding networks by creating new objects and linking them with existing objects begins the process of simulating hypothetical demand needs of future developments.