Sprinkler Daddy Says:
Head to Head.

Why Your Sprinkler Design Uses Head to Head Coverage - And What Head to Head Coverage Is

Head to head coverage is the manufacturers recommended way to design a sprinkler system.  In a nutshell, this means that you'll get as close to equal coverage as possible.  When you've got equal water coverage, you'll use a lot less water and your sprinklers will be on for shorter periods of time because you don't need to over water in some areas just to get the bare minimum in others.

Another thing to keep in mind is that a sprinkler can only spray as far as the shortest distance it needs to cover.  So if you have a 10' x 40' strip of grass, each sprinkler can only spray a maximum of 10'.  If you don't stick to these guidelines, you'll end up wasting money spraying your fence, house, garage, or the street when you don't need to.