Yep. It's tuna can time. Fortunately, you only need to do this once.
Set empty tuna or cat food cans at intervals around your lawn and garden. Turn on your sprinkler for 15 minutes.
Measure the amount of water in the cans. Now that you know how much water your sprinkler puts out, you can figure out how long to leave it running
when it's time to water.
Example: After 15 minutes of running your sprinkler, you have an average of 1/4" in your tuna cans. When the ET Index is 1/2" (and you haven't had any rain), you should
run your sprinkler for 30 minutes. For an ET of 1/3", you'd run the sprinkler for about 20 minutes.
STEP THREE
Determine your watering day using the Summer Schedule.
Check the ET amount on our website or in your favorite newspaper or weather report, and water
only as much as needed. Watering between 7pm and 10am will help ensure that the water you use stays on your lawn and
doesn't evaporate during the heat of the day.
Want to know more about the technical side of ET? Find information on how ET is calculated, irrigation controllers that use ET and more, here.
