Dosing the Network

Video quiz

In order to define a concentration profile in the Water Quality Grid, which source type would you select?

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Step-by-step guide

When performing a Multi Solute Water Quality simulation, after the MSQ model has been set up, the next step is to dose the network with the contaminants. This exercise simulates a fixed head as a source of contaminant A, and a reservoir as a source of contaminant B. Each source needs to be dosed with the relevant contaminant.

First, set the fixed head as the source of contaminant A from 02:00 until 22:00 on the first day of the simulation:

  1. In the Model Group, double-click the MSQ Network to open it in the GeoPlan.
  2. Zoom into and select the fixed head ENMORE_BH_B.
  3. Click the Properties tool.
  4. In the Properties panel, expand the Water Quality (MSQ) section.

In the InfoWorks WS Pro interface, Fixed Head Properties window the Water Quality (MSQ) section expanded and highlighted in red; and in the GeoPlan, the MSQ Network open with the fixed head highlighted in red.

  1. In the Water Quality Profile and Sources row, click the More (…) button.
  2. In the Water Quality Profile and Sources dialog box, in the WQ Solute ID column, set the first value to A.
  3. In the same row, set the WQ Initial Concentration to 0 mg/l.
  4. Expand the WQ Source Type drop-down and select Fixed Concentration to set the dosing profile.
  5. Expand the WQ Before Profile drop-down and select Zero/Unchanged. This applies a value of zero from the start of the simulation until the time of the contamination event.
  6. Expand the WQ After Profile drop-down and select Extend Forward to extend the last value in the profile grid—in this case, zero—to the end of the simulation.
  7. Enable the WQ Repeat Profile option.
  8. Expand the WQ Repeat Period drop-down and select 1 week.
  9. In the WQ Solute ID column, select the A cell.

The name of the Profile for group box changes to “Profile for A”.

  1. In the Profile for A group box, in the first row, expand the Date & Time drop-down and select May 2, 2022.
  2. In the same field, set the time to 02:00:00.
  3. In the Conc (mg/l) column, enter a value of 5000 mg/l.
  4. In the second row, set the Date & Time to May 2, 2022 at 22:00:00.
  5. Set the Concentration to 0 mg/l.
  6. Click OK.

The Water Quality and Sources dialog box with options configured to set the fixed head as the source of contaminant A for a 20-hour period.

Next, set the reservoir as the source of contaminant B from 02:00 until 22:00 on the first day of the simulation:

  1. In the GeoPlan, select the ENMORE_RES_A reservoir.
  2. Click the Properties tool.
  3. In the Properties panel, expand the Water Quality (MSQ) section.
  4. Click More (…).
  5. In the Water Quality Profile and Sources dialog box, set the WQ Solute ID to B.
  6. Set the WQ Initial Concentration to 0 mg/l.
  7. From the WQ Source Type drop-down, select Fixed Concentration.
  8. From the WQ Before Profile drop-down, select Zero/Unchanged.
  9. From the WQ After Profile drop-down, select Extend Forward.
  10. Enable the WQ Repeat Profile.
  11. In the WQ Repeat Period drop-down, select 1 week.
  12. In the WQ Solute ID column, select the B cell.
  13. In the Profile for B group box, in the first row, set the Date & Time to May 2, 2022 at 02:00:00.
  14. Set the Concentration to 7000 mg/l.
  15. In the second row, set the Date & Time to May 2, 2022 at 22:00:00.
  16. Set the Concentration to 0 mg/l.
  17. Click OK.

The Water Quality and Sources dialog box with options configured to set the reservoir as the source of contaminant B for a 20-hour period.

  1. In the Model Group, right-click MSQ Control and select Commit changes to database.

In the Model Group, the MSQ Control shortcut menu is expanded with Commit changes to database selected; and the MSQ Network is open on the GeoPlan.

  1. Click OK.

With the contaminants for both water sources now set up, the next step is to configure and run the MSQ simulation to see how the substances react.