Allocating demand

Step-by-step Guide

In InfoWorks WS Pro, allocating demand to nodes throughout a water supply network is crucial to the accuracy of simulations. Because consumer demand varies by time of day, day of the week, and time of year, demand categories provide 24-hour profiles for a particular type of consumer.

The demand diagram contains categories that define the demand pattern for an individual type of consumer. This example assigns a demand category and specific consumption properties to a node for a planned housing development.

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. In the Scenarios toolbar, expand the Select scenario drop-down.
4. Select a new scenario that has a new node linked to the existing network.

To open the Demand Diagram window, which must be open:

5. From the Model Group window, expand Demand Diagram Group.
6. Select BridgeTown ADAW.

To define the demand category for the node representing the future housing development:

7. From the Tools toolbar, select Properties.
8. In the GeoPlan, select the new node.

9. From the Properties panel, in the Demand By Category option, select More (…).

Note: A demand category can be defined in one of three ways. This example defines demand per property.

10. In the Demand By Category dialog box, expand the Demand Category drop-down and select DOMESTIC.

Note: This list is populated by the categories contained in the current Demand Diagram, which is running in the background.

11. Expand the Category Type drop-down and select Property.
12. In the Number Of Properties field, enter an estimation of the number of properties in the category, such as “100”.
13. In the Specific Consumption field, enter an estimation of consumption for each property, such as “400”.
14. Click OK.

Notice in the GeoPlan, the node shape updates to a star, representing the new allocation of demand.

To verify the scenario and commit the changes to the database:

15. In the Model Group window, under Session 05, right-click BridgeNet and select Commit changes to database.

16. In the Commit changes to database dialog box, under Comments, enter a description of changes made.
17. Click OK.

IMPORTANT: To run accurate simulation models, it is critical to allocate appropriate demand categories to objects within a model group.