Performing extended period simulation calibration

Step-by-step guide

In InfoWater Pro, an extended period calibration consists of correlating known extended period field data with an extended period simulation. The difference between an extended period and a steady state calibration is that the times at which field measurements were acquired can be entered. Thus, a model can be calibrated over a series of timesteps, rather than at one point in time.

This example calibrates pipe roughness for a pressure zone for an extended period.

With a project open and initialized, and a simulation run completed for the scenario, set up an extended period calibration run for the active scenario:

1. On the InfoWater Pro ribbon, in the Project group, click Apps.
2. From the Apps Manager, select Calibrator.
3. Click Run to open the Calibrator app.

4. From the Mode menu, select Extended Period.
5. From the Roughness Group tab, in the Pipe Group Database Field drop-down, select PIPE_GROUP.

The PIPE_GROUP is already created for this example and consists of four pipe groups of varying sizes in the model.

In this tab, ranges for pipe roughness coefficients can be specified.

6. For each of the first 4 rows, make sure that the following values are set:

• Minimum roughness: 50
• Maximum roughness: 120
• Levels: 10

The increment for the calibration from Min to Max is determined by Levels (each increment = [Max-Min] divided by Levels).

Next, set up the different times and data for the EPS calibration:

7. Switch to the Junction Pressure tab.

In this tab, known field-measured pressures can be entered for specific junction nodes at different times across the distribution system.

For this example, set up the first 6 rows of the table as follows:

8. In Row 1, enter a Junction ID of J616, a Time of 0, and an Observed value of 51.
9. In Row 2, enter: Junction ID J816, Time 0, and Observed 109.
10. In Row 3, enter: Junction ID J616, Time 8, and Observed 52.
11. In Row 4, enter: Junction ID J816, Time 8, and Observed 112.
12. In Row 5, enter: Junction ID J616, Time 18, and Observed 47.
13. In Row 6, enter: Junction ID J816, Time 18, and Observed 105.

14. Switch to the Pipe Flow tab.

In this tab, known field-measured flow can be entered for specific links (pipes, valves, pumps) at different times across the distribution system.

Set the following for the first 3 rows in the table:

15. In Row 1, enter a Link ID of 12965, a Time of 0, and an Observed value of 0.
16. In Row 2, enter: Link ID 12965, Time 8, and Observed 730.
17. In Row 3, enter: Link ID 12965, Time 18, and Observed 720.

18. Switch to the Tank Head/Level tab.

In this tab, known field levels can be entered for specified tanks at different times across the distribution system.

Set the following for the first 3 rows in the table:

19. In Row 1, enter a Tank ID of T5004, a Time of 0, a Type of Level, and an Observed value of 120.
20. In Row 2, enter: Tank ID T5004, Time 8, Type Level, and Observed 116.
21. In Row 3, enter: Tank ID T5004, Time 18, Type Level, and Observed 115.

Now, run the calibration simulation:

22. From the Run menu, click Start to begin the calibration simulation process.
23. On the Run tab, look for the green traffic light to indicate success.

For an extended period calibration simulation, it is normal for the success indicator to turn green before the Trial Progress has completed.

24. Review the Run Summary tab as well.
25. Review the results on the four tabs where data was entered.
26. On the Junction Pressure tab, click Graph.

The graph shows the correlation between observed and simulated pressure.

27. Close the graph.
28. Close the Calibrator app.
29. Save the model.