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Age analysis - Tank empty

Dear All,

I attached my water model for reference. the issue is, i am not getting correct result for age analysis "Age (maximum) (hours)"

In the model you can see "ADD + 10% for Age with reservoir" and "ADD + 10% for Age with tank and reservoir" as two scenarios for age analysis. Basically, the difference between scenario is water source as one scenario analysis with directly from reservoir and other with tanks.

I showed the results to client with "ADD + 10% for Age with reservoir". Since, there is no notifications in it. Further, u can see other scenarios apart from these scenarios. All those are worked with tank as water source. You can see the change in the active topology. these scenarios are working well.

Now, the problem is client needs the age analysis with tanks as water source as actual existing. So i tried, but notification shows all tanks are empty. (Note: all the tank details are actual as built). hence i inserted a reservoir for permanent source of water. After, introducing the tank, the notification says some times, tanks full or empty. since, i was not able to fix the elevation of reservoir.

Hence, how to fix this age issue with tanks. Further, I attached 2 squilte files one "Islandwide prposed 150mm and Without FF at existing SB area.wtg" is the one all iterations i done. other one "Original shown to client" is the one i shown to the client. the main difference we can see is the pumping station header main. I faced problem with the original for age in commmon discharge pipes with out flow. so i connected all the discharge pipes at one point.

expecting the Solution.