This very long thread talks about how the formula that Rachio provides does not work in your situation (mine is similiar - mostly .5 and 1 GPH emitters, with a few 2GPH emitters tossed in, and no easy way to count them). I ended up running each of my zones for 10 minutes and getting a reading at the meter - defined mine at .2 in/hr and that seems to work well in my case. I would expect yours to be slightly higher since yours are all 1GPH emitters.
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