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Multiple Demands

Junction node demands can be edited either in the 'Junctions' editor for each particular node or in the 'Multiple demand' editor, which allows to display and edit all multiple demands. The 'Multiple demand' editor is available under the 'Water Demand' group in the Setup tree.

It holds the following attributes:

  • Junction ID (mandatory): The Junction ID identifies the selected Junctions which multiple demands are assigned to.
  • Demand (mandatory): The demand field shows all the values that are assigned to junctions with multiple demands. The demand values must be manually entered in the demand field.
  • Description (optional): This data entry allows you to enter a description identifying the multiple demand being defined. This description can be output in reports generated by the reporting tool.
  • Demand Category (optional): Pattern category is not editable but is automatically displayed based on the category defined in the pattern Editor for the particular Pattern ID. It is possible to import and export multiple demands from the ASCII text files, which allows easy data exchange with other programs.
  • Demand Pattern (optional): This data entry allows you to define the ID of the demand pattern to be applied to the junction node demand values during an extended period simulation. This demand pattern will be applied to the defined baseline demand. If a groundwater well is associated with this node, then a demand pattern should not be assigned—otherwise the groundwater extraction rate will be adjusted according to the assigned demand pattern. By default this data entry is blank and default demand pattern ID of 1 is assigned.
  • Is active: This check box allows the user to toggle the Active status of the demand on and off. The simulations will omit all demands that are not active. Demands which are not active are also omitted in the ‘Statistics and redistribution’ table.
  • Meter ID: This is a reference to a water meter ID defined in the Advanced metering infrastructure editor. This information is for use by Water Distribution Online to automatically and periodically update the hydraulic model's water demands based on the real-time telemetry data, and is therefore only used in combination with the special analysis 'Online analysis'.