I've got my Rachio set up with 5 zones of St. Augustinegrass in Orlando, FL. I'm even part way through the Advanced Parameters ("Sand" identified from my septic tank survey, 0.15 in available water from the online soil surveys, and a 5 in root depth from browsing the forums, catch cup test to come).
I've been looking into St. Augustingrass care before I set up my Rachio and most recommendations are the same: .75 in of water whenever the grass needs it. This translates into every 1 to 2 weeks in the winter and every 2 to 3 days in the summer.
Assuming my precipitation rate is correct at .92 in. per hour with my rotor head (it's not, but I'll get the catch cup test soon), my Rachio has me watering 13 minutes at a time on a flexible monthly schedule. As I scroll through the year, the frequency seems right, increasing from every 5 days to every 2 days in the summer, but 24 minutes just doesn't seem like enough. At 1 in per hour that would translate into about .368 in of water, which doesn't seem like enough.
Here's a link to the watering recommendations: http://www.qbdfl.com/docs/manuals/YearlyCalendarFloratam.pdf
My question is this: Should I be assuming that what Rachio suggests are better and more efficient watering methods than what these guidelines suggest, or should I assume that I have some Rachio parameters incorrect and should change them until they kind of match the guidelines?