3' horizontal is supposed to be equal to 1' vertical when figuring pumping
"head", so 25' horizontal + 4 ' vertical is ~ a 12' head you are dealing
with, as wellas the other 25 ' on the other side of the pump
Gale :~)

If I set it up as I planned, sucking water through
about 50' of 2" pvc and up about 4', am I going to have problems? Would
it
make a significant difference if I had the pump in the middle, 25' from
the
pond, but before the slope? FWIW, the pump is rated for a little less
than
3000 gph at 4' height.