Adjustment Groups
Adjustment groups are groups of elements whose attributes are adjusted together during the calibration process. You must be careful to group similar elements and not dissimilar ones. You can adjust the properties for a group as a whole but not for individual members of the group.
There are three kinds of adjustment groups, each of which are created and modified in their respective calibration study settings tab:
- Roughness Groups - Add, edit, delete, or rename Roughness adjustment groups in the Roughness tab. Each roughness group should comprise elements that have similar attributes, such as pipes in a location of a similar material and age. Adjustments made to a group are applied to every element in the group. Click the Export Groups button to export the Calibration Group ID data to an automatically created user defined attribute. All elements within a calibration group will have an identical Calibration Group ID. This allows you to color code by calibration roughness group.
- Demand Groups - Add, edit, delete, or rename Demand adjustment groups in the Demand tab. Adding Demand Calibration adjustment groups introduces more unknowns into a calibration problem. If available, you should enter more accurate demand data into your Bentley WaterGEMS model, rather than adding Demand Adjustment Groups. Consider creating Demand Groups based on usage patterns. Click the Export Groups button to export the Calibration Group ID data to an automatically created user defined attribute. All elements within a calibration group will have an identical Calibration Group ID. This allows you to color code by calibration demand group. You can automatically create demand groups from selection sets using the Group Generator. To open the Group Generator click the Create Multiple Design Groups button.
- Status Elements - Add, edit, delete, or rename Status Element adjustment groups in the Status Elements tab. Status indicates whether a pipe is open or closed. GA-optimized calibration will identify the status of each pipe within the status group so that the chosen objective function is minimized. Status groups are generally used when a particular area of the system is believed to contain a closed pipe or valve. We recommend that Status Groups comprise, at most only a few pipes, or one pipe. Click the Export Groups button to export the Calibration Group ID data to an automatically created user defined attribute. All elements within a calibration group will have an identical Calibration Group ID. This allows you to color code by calibration status group.
Each adjustment group tab consists of a table that lists the adjustment groups, a New button to add groups to the table, and a Delete button to remove the currently selected group from the table. The table consists of the following columns:
- ID: The automatically assigned ID of the adjustment group.
- Label: The user-defined name of the adjustment group. To change the label, click on it and type a new name.
- Element IDs: The elements that are contained within the adjustment group. Clicking the ellipsis button in this field will open the Selection Set dialog, which allows you to add and remove elements by selecting them in the drawing view.
- Notes: Use the Notes field to enter any comments you want saved with the adjustment group.