Any pumps gph
at max head is 0 gph
or as most pumps list it as shutoff meaning it doesn't have the pressure to pump it beyond that head height.
That pump drops off 68 gph
with a 4ft head and probably double that with a 8 ft head so it should produce around 600-650 gph
with a 7ft vertical/10 ft horizontal application. Obviously vertical pumping is going to put more pressure against a pump than horizontal but 10 ft of pipe is going to add 1-2 head height pressure as well.
has some great reading on pumps as well.