I see that you have much more experience with REAL irrigation than I do!
>> Only have enough pressure to run one area at a time.
Ouch.
That was why I started my system with 100 feet of 3/4" mainline, then branched it "wherever" into 1/2" mainline.
But my yard is tiny and I could run the whole thing from one 1/2" line. That's supposed to supply 240 GPH at a manageable pressure drop, but I never measured it. I do have 45 psi city water which is nice.
