Mohamad Azzam

The y-intercept is only equal to 'static head' in the simple case where you have one pump in the system. This case also happens to be the one all engineers learned about in school because it is easy to solve by hand, and so this causes a lot of confusion…

I would probably just use WaterGEMS to compute the HGL at J-1 when PMP-2 is on and PMP-1 is off... But you should also find that the HGL at J-3 is the same as the HGL at J-1. That's because there is no flow from J-1 to J-3 (so no headloss)...but they…