jm,
Hydrualic HP = lbs of liquid per minute x head (in feet) / 33,000
Pump HP = Hyd HP/Pump Efficiency
After you work this out, call your trusted pump vendor/mnfr, and work out w them the most logical pump to purchase based on your specific needs/ conditions.
You need the flow in, say, gallons per minute, cf per hour, or lbs per hour,,,,,,,,
amount of water / amount of time
after that it's straightforward.
Good Luck