Here’s a simple test to determine how much water your sprinkler system applies to your yard:
Place 5 or 6 flat-bottomed containers (such as coffee mugs, tin cans, cake pans, etc.) on your lawn. Distribute them as evenly over your lawn as possible, keeping them at least 2 feet from the sprinkler heads. Turn on the sprinkler system so that the containers begin filling with water. After 15 minutes, turn off the system. Use a ruler or tape measurer to determine the depth of water in each container. The measurements will probably be between 1/8 to 7/8 of an inch.