Step-by-step guide

A model with a poor observed vs simulated verdict may need an adjustment in the pipe friction factors throughout the network. These can be automatically determined and adjusted using the automatic calibration routine.

From the Model Group, right-click Run Group.
Select New > Run from the flyout.

In the Model Group, Run Group shortcut menu, New and Run are selected.

The Schedule Hydraulic Run dialog box opens.
Type “Calibration” in the Title field.
Enable Experimental.
Then, from the Model Group, drag and drop the Calibration network into the Network panel in the Schedule Hydraulic Run dialog box.

Note: The Control and Demand Diagram panels populate as well.

In the Run Type group box, expand the drop-down and select Calibration.

In the Calibration Options dialog box:

Set the Minimum Friction factor to 0.001.
Set the Maximum Friction factor to 5.
Set Initial Scaling Factor to 0.5.
Set the snapshot time to 2 May 2022 at 06:00.
From the Model Group, drag and drop the Live Data Configuration into the Live Data Configuration panel.

Note: If this dialog box is closed, to reopen it, in the Run Type group box, click Options.

Click OK.

The Calibration Options dialog box, showing all parameters set for this exercise.

In the Run Parameters group box, set the Computational Accuracy to 2 l/s.
Click Save.
Click Run.

In the Calibration Options dialog box, all parameters are set.

Note: Once the run is complete, the pipe friction factors can be updated. It is best practice to update the friction factors in a scenario first, before altering a base model.

To update the friction factors in a scenario:

In the Scenarios toolbar, click Create scenario,
OR Expand the Scenarios menu and select Create scenario.
In the Create New Scenario dialog box, in the New Scenario Name field, type “Calibration”.
Enable the option Create matching scenario in the Control.
Click OK.

In the Create New Scenario dialog box, the scenario is named Calibration and Create matching scenario in Control is enabled and highlighted.

Note: The Calibration scenario now appears in the drop-down in the toolbar:

Part of the WS Pro interface, with the Calibration scenario showing in the toolbar, and the Cal Network and Cal Control showing in the GeoPlan.

Select the Calibration Scenario.
Expand the Network menu.
Select Update from calibration > From simulation.
In the Open Sim dialog box, select the Calibration simulation.
Click OK.

The Open Sim dialog box, with Cal Control selected, the Filter items option enabled, and OK being selected.

The friction factors of the pipes in the calibration scenario have been adjusted.

Commit all the changes to the database.
Click OK.

The Commit change to server – Network Cal Network dialog box reports 62 objects added, and 2 settings changed.

Create a new Run:

Right-click Run Group.
Select New > Run.
In the Schedule Hydraulic Run dialog box, in the Title field, type “Calibration Update”.
Check the box next to Experimental.
From the Model Group window, drag and drop the Calibration network into the Network panel.

Note: The Control and Demand Diagram boxes populate as well.

In the Scenarios tab, deselect the Base scenario.
Enable the Calibration scenario.
Click Save.
Click Run.

In the Schedule Hydraulic Run dialog box, all parameters are set.

To produce the observed vs simulated grid for the updated simulation:

Expand the Results menu.
Select Grid reports > Observed vs predicted.

The Grid Report (Observed vs Predicted) dialog box opens.

From the Model Group, drag the Calibration Update simulation and drop it into the Sim panel.
Drag and drop the Live Data Configuration into the Live Data Configuration panel.
Under the Options, select Pressure.
Click Produce Grid.

In the Observed v Predicted dialog box, all parameters are set, and Produce Grid is highlighted.

The Grid Report opens, displaying the observed versus predicted data:

The Grid Report: Observed vs Predicted - Pressure dialog box, zoomed in to the results data.

Determine whether the verdict has improved following the calibration.

If it has, reintegrate the Calibration scenario into the base model:

With the Calibration Network and Calibration Control open in the workspace and set to the Calibration scenario, in the toolbar, click Manage scenarios.

A notification appears, asking you what type of scenario you want to manage.

Click Network to open the Manage Network Scenarios dialog box.

Note: the Calibration scenario is highlighted at the bottom of the list. To make this scenario the new baseline scenario,

Click Reintegrate.
In the notification that appears asking if you want to reintegrate this scenario, click Yes.
Commit the changes to the database.

The Commit change to server – Network Cal Network dialog box, showing the final number of changes made, including 62 objects deleted, 62 objects changed, and 4 settings changed.

Automatic calibration simulations for InfoWorks WS Pro mains models

Tutorials

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