@jmed999, Flex schedules will delay the watering event until ET justifies it’s needed. This takes place on a zone by zone basis.
Flex schedules do this. We use MAD (management allowed depletion) to determine when to trigger a watering event on a zone by zone basis. MAD is defaulted to 50%. For details on fine tuning your schedules, please refer to this support article.
I’d give this post (and embedded links) a review if you’d like to learn more about available water.