[Zeke]

Well, in the city we use simple heads, but that's too much plumbing for an acre. I's suggest going to a site like Rainbird and getting specs. Zone your lawn off so that you can have enough volume to run the sprinklers a few at a time.

I'd oversize your supply line by one size, especially to the furthest zone. It might be 1" to the first head, 3/4 to 2 more and 1/2 to one on the end. I'd use that formula for the close zones and go bigger to the first head reaching way out there.

I don't know what kind of equipment you use on the lawn, but placing the pipes well below grade is always a good idea. Use no less than Sch 40.

BTW, for those that read this and have a small area, a grid using standard 10 ft lengths w/o cutting them makes a great system for the full circle, half and quarter circle heads. You don't need no stinkin' drawing to do that, just reduce the pipe size after a couple heads. I found I could get the equivalent of around 5-6 full heads on a valve and have plenty of reserve. Most people have no idea how to adjust the individual heads and the supply valve for minimum overlapping and minimum overspray. They just waste water.

I hand water a lot and have NO automatic valves.