Our irrigation system was installed last year. Now that we're getting deep into the dry summer months, infrequent, but deep waterings are growing important. However, I'm not sure how long I should be setting each station. Installed were Hunter rotor heads and some Rainbird heads for some other areas. We have a pump as well and that runs on each station, but two. I've heard about putting a coffee can out to measure water output in an hour. Is there a better way? If that is acceptable, can someone add some more details?