Well. Everything is head to head coverage, with 3 heads per zone, 2gpm nozzles in each (1gpm in some). I put the system in, as this was the post
My sprinkler system
The front was the only problem. I tried getting "head to head coverage", which was a success in the backlawn, but was impossible in the front. There are large oak and pine tree roots all over. I was going to put sprinklers on the outside perimeter all the way around, and put a row down the center of the lawn for head to head, but could'nt dig near the outside at all. So, I just centered a row down the middle the best I could to get everything. I might have to water it a few extra minutes, but....it works.
The back is watered very evenly, but needs to be re-seeded, so it looks weedy and a mess right now. The front is the only problem. We do have low water pressure, thats why its 2gpm nozzles and only 3 heads per zone MAX. Maybe 5 heads per zone if I put 1gpm nozzles in all of them, but then i'd have to water longer per zone.
For the front, (at least the small "outfield" I'm trying to water, is there a better 3 sprinklers I can install in place of the Hunter PGP-Ultra's that would water more volume and farther with the water pressure I have?
I will try to water earlier in the morning I guess. 2am start time? And do the cycle irrrigating.
"Use a cycle and soak method of irrigating. Instead of 1 start time of a zone to run for 30 minutes. Split it up... ( within a few hours not through out the whole day) .. 2x 15 min... or 3x 10 min. This allows the water to soak into the dirt and properly apply the correct amount of water the lawn needs instead of creating run off"
The dirt is a pretty good topsoil that was put down last year. It was actually raked in, and had about a good 4-6 inches of topsoil, but that was a nightmare, because even know we had it the same grade as the old stuff before, and we packed it down too, most of it washed away along with the seed. Never again
Our whole lawn slopes down hill through some front woods, and down to the road. Raising the level of the lawn and grading it is not an option either. We are lucky its as flat as it is now. Thankfully most of the clay is down about 4". So we will just have to live with the soil we have right now, unless they have some kind of magical "clay loosening fertilizer"