Im currently working in a water feature company.here's the system i'm designing. there is a pool in the second level with a couple of fountain nozzles attached in a manifold pipe. the pump room is on the ground level. water suction comes from that pool and pump's discharge is connected to the nozzle manifold. the elevation difference is 4m and the tip of the nozzle above water level is 20mm.

--- my understanding is that my total static head is only 20mm since suction and discharge is from/to the same pool. ( am i right on this?)
--- assuming my total head loss is 2m ; that would give me 2.020mTDH ( my question is when i select a pump, should i based my TDH on 2.020m or i will need to add the elevation difference which would give me 6.020m)

--- what i did, i use the 6.020mTDH ( am i right on this?)

thank you very much in advance