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### Background Concentration

Background concentrations are included to consider additional loads within the river network which might be monitored upstream from the first known discharge. Note that the given value is used as it is and is only added to the model results after the simulation. The background concentration is not considered within the elimination processes.

The concentration has to be entered before running a simulation. The unit is always [mg/L]. After the simulation the specified background concentration will be added to the model results. If the model results are displayed in a different unit an automatic conversion will be activated for the background concentration. Depending on the extent of the catchment, the addition may take some time. Finally, a remark is added to the scenario's view title bar (`Background Concentration xxx [mg/L]`) to hint about the added value.

To unset a background concentration, enter a concentration of zero in the dialog.