One of our commercial clients got a water bill for 1 million gals. for last month. So they had leak detection company monitor the water over the weekend. They said that over the weekend the irrigation system used 2700 gals. I did find a broken pipe on one station that runs 20 mins a day 6 days a week. The system had been set to run a total of 140 mins a day spread over 8 stations 6 days a week. I know that's probably too much but its still nowhere never a million gals in my mind. O and incase you couldn't tell I don't work with irrigation much.