I just installed my gen3 flow meter and when calibrating it one of the zone was using 18.4 gallons per minute which was almost twice the flow as I expected. Reviewing that zone I found a sprinkler head that was broken way below the surface. Thanks Rachio for saving me water!
UPDATE - second problem identified by the flow meter
During the calibration one zone popped up an alert saying that the flow was too low. The flow was .4 gallons per minute for a 55 foot long hedge being watered by a drip line. After checking out the valve and the pressure regulator I found there was a defective pressure regulator. After I replace the pressure regulator flow was 1 gallon per minute.