The major issue using one of these hydraulic pumps is a hydraulic oil leak
frying the tractor and polluting the water.
The HALE SUPERCHIEF floating fire pump works in 3 inches of water.
It has a 2.5 inch connection and will pump 420 gallons per minute at
50 PSI.
Right now it is $4,055.00 plus tax and freight from the folks at FELD FIRE.
The current price is 10% off.
Resistance to fluid flow creates pressure.
This HALE self priming centrifugal pump can pump water 20 feet up hill @ 50 PSIG
if that is what your major concern is.
If you are using this water to irrigate crop land using rotating gun type sprinklers
and aluminum delivery pipe you are going to need much more flow per second.
The small traveling reel type sprinklers have smaller hoses and rain guns.
Is there any reason you cannot use a portable fire pond at the upper elevation?
Please tell me more about what you think your needs are.