In a couple of days we will be releasing code that will start using the true crop coefficient on the zone, versus a pre-determined monthly sliding coefficient. We now default crop coefficient to 70% for cool season grass (i.e. Colorado) and 65% for warm season grass (i.e. CA, TX, FL, etc.). This will ONLY affect new flex schedules, not pre-existing ones.
This topic gives a little more context:
I wanted to share a graph with the differences for Colorado, cool season grass. The left top/bottom images are the current flex settings using the pre-determined crop coefficient, the right top/bottom images are using the zone crop coefficient.
Notice the crop evapotranspiration pulls the graph down slower on the right since it is using 70% versus the pre-determined May setting (90%). I believe most warm season crop users will not see a difference, cool season crop users will probably see a bit less watering.
The great thing about moving to this one configurable value is that it is a very easy lever to move for adjusting watering frequency without affecting duration.
I've updated the flex adjustment documentation to reflect this change:
Please let me know if you have any questions.