How to create a system curve in Epanet for closed pipe systems?

[regina_casimiro]

I'm trying to generate a system curve (for pump 2) from Epanet following the thread

https://www.eng-tips.com/viewthread.cfm?qid=458044#post

thread378-458044

The problem is that my network is a closed system...and I don't know where to insert the reservoir
at the discharge portion...and how to find out its head

Thanks for any advice! Model is attached