You know how they say there's no such thing as a stupid question? They're wrong. This is a stupid question.
Appropriate stats for any pump are going to be head and flow. Combined they produce a chart like this:
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Don't forget that if you're pulling up from a creek to the pump that lift will count as part of your head. Horizontal distance will also affect your head, though calculating the friction loss is too much like real math for me -- I usually just estimate it by making sure my pump is overprovisioned for the amount of lift I need to get out of it.
The bottom line is that if you know nothing about pumps, you should figure out your vertical and horizontal run along with your flow requirements and head to a Honda dealer. You'll pay a bunch, but you'll get solid equipment that'll do what you need and won't die on you half way through the season.
You also really should use a water tank -- pump up to your tank, then from tank down into irrigation system. Trying to use a gas pump to feed direct into an irrigation system is asking for trouble. Plus, using a tank means you don't have to pump every other day.
Also -- bury your line up from the creek, and do it early so vegitation can grow over it before the summer hits.
Finally -- gravity flow rules. I've used a mile of water line to bring water down one side of a ridge, across the creek, and then up the other side because even using that much line was better than hauling a pump down to the creek three or four times a week.
