Meadowlark---There are several sod farms near me and they all use PTO powered pumps to water. The biggest one I've seen was a 6" pump running 300+ feet of 4" irrigation pipe. It was pumping out of a nearby 1 acre pond. It lowered the level in the pond about 4" over an eight hour period. I'm sure someone here can do the math to figure the volume of water that is.

I'll start treating my wife as good as my dog when she starts retrieving ducks.
http://geocities.com/h20fwlkillr/