This question has been posed literally for YEARS now with never a satisfactory answer or apparent action! Why don't we install water sensing water controllers which - like the one at our house - determines when it is raining or has rained to stop the irrigation cycle until it dries?
During the rain recently we were paying for extra water as the sprinkler system in the neigborhood of the east entrance was full on.
You'd have a very hard time convincing me that our grounds are responsibly managed from a cost-saving point of view. Remember, this has been ongoing for YEARS. It's not only costly, but irresponsible.