Scenario Analysis

I try to run the Scenario Analysis and it always gives me the same values as an output even though I set it to change the Q_in. Of course this is not possible to happen!!! I set the Scenario Analysis parameter to be an input variable (the Q_in from the Municipality block) and I use the spacing setting for this parameter. The pane with the runs shows the values i want to use. However,the results are exactly the same for every run because the program 'reads' only one value. What can I do?

You cannot use the Qin of the influent as a scenario parameter - because it's not a parameter. What you would probably want to do is to run a SA where each run uses a different input file.
This cannot be done through the WEST user interface directly though.
What you may consider dose a by-pass that diverts a fraction 'f' the influent - and rather use the fraction f as parameter for the SA.