I installed my own system when I built my house. Quite simple, no solenoids or multiple zones. I was able to get the coverage I needed for my size yard with singles. I've changed things here and there, used to use gear rotators in the back yard but changed to Hunter MP rotators which I really like and work well. I used 3/4 for the back yard, and 1/2 for the front, if I were to do it again I would use 3/4 in the front as well, but that was my rookie mistake. I'd never installed a system before and its well worth it. My lawn is the best one on the block by far. I have them running on rain bird single zone timers, digital programmable to do whatever I want for programs. Its been hassle free.
As for in an established yard, thats a bit more work, I was able to trench into my topsoil before sod which was good. You can rent a trencher or just spend an afternoon turning dirt, its not like you're digging a big hole, just getting a 6-10"deep trench going wherever you lay lines. You can do it with minimal yard damage if you are carful with your turning.
As for under driveways and stuff, fortunately you're not the first to encounter this so they have tools to use for that. They make a jet tunneling attachment for the line you are putting underneath. You attach the nozzle to the front end, you attach the hose connector to the other end of the line, and you turn on the water while feeding the line underneath the concrete, the jet stream of water creating a cavity for the line to pass through. Unfortunately in Calgary we have alot of large rocks, and those don't help, so I can't speak to the effectiveness of this thing....but they do sell it for that purpose alone.
Any other questions just PM me, I can give advice about the planning and all that as well
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