Makes sense... You could do that zone orthogonal to Rachio. For the record, I'm pretty happy with the Rachio: I live in LA, and when I got a $100+ water bill, I took the initiative. Our water dept. actually had a rebate that included the Rachio. It's nice not to have to worry about sensors or anything like that -- but setup was a little tough. I think I was too aggressive on how I specified my lawn parameters (soil, sunlight, etc.), and a good portion of my grass deteriorated.