Are you sold on an electric pump? Is gas/diesel an option. I pump creek water about 600 feet with a total head of about 60ft(about 20ft suction head and 40ft discharge head to top off a 2.5 acre pond. I have a 8hp 4 inch Honda semi trash pump that works really well. It will pump about 400gal/min with zero head. It pumps about 300 gal/min for my setup.
For your situation (.5 acre) a 2 or 3 inch pump would do just fine. You need to consider what the suction head is. Most centifugal pumps (within reason) won't lift water more than about 20-25 ft. This can be a limiting factor depending on the lay of your land. The pump may push the water 60 or 70 vertical feet (dischrge head) but only be able to pull 20-25 ft up out of the creek. Again, I dont know your situation.
This info is good to know before you spend money on a particular pump.
My $.02
Eddie
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