Is it city water or a well. If city water, what size and type of pipe is your water service line . How did you come up with 58 psi pressure loss??

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I used a worksheet from irrigationtutorials.com. The line from the street (not well) is copper, I believe.

I see now, they are using the 30psi for the sprinkler heads as a "loss". Anyway, I would not combine the two bigger zones, thats approx. 15 gpm through 3/4" copper service. Max we would go under right conditions is 11-12 gpm. You may get premature meter failure. You could do the 7.4 and 1.56 together. (how did you get 1.56 gpm ). 15 gpm through 3/4 K copper loses approx. 30psi/100 ft. at approx. 11 ft/sec Too high ! Stay with 2-3 zones. How long is your service line. 3 psi loss seems low for that item based on your flows.

The copper line is about 25-30ft. Then maybe 70ft of 1" PVC to the valves. I have four sprinklers on the 1.56 gpm zone. The number came from rain birds specs.

they must be spray heads. that averages to about .4 gpm each. with 30ft copper the 3psi loss could be right.

I'll be sure not to run the 2 big zones together. Thanks!