return pump flow question

after reading marks page about his 500gph return pump actually only being 300gph after it goes up the display...

how much do yall think i would get (gph wise) with a rio 1700 (642 gph)
after it reaches the display?
 
Max Flowrate: 642gph
Max Head Hight: 8'
Outlet: 3/4” OD (1” OD with hose adapter)

Flowrate Chart:
Head Height______GPH
0'_______________642
1'_______________620
4'_______________352
6' _______________180
 
the flow would depend on if the rio is operational for one, (i had one poop out and killed my hermits while cycling, HERMITS!) and headway in feet, and how many 45 or 90 deg turns you have before it returns to the pump.
 
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