The answer to 'why is my irrigation system bare spots' is that there are several common causes, including improper sprinkler head placement, water pressure issues, or overwatering in certain areas. Bare spots can be a sign that the irrigation system is not providing even water coverage across your lawn.
Some common symptoms include dry, patchy grass, uneven growth, and standing water in some areas. To troubleshoot, check that sprinkler heads are not blocked or obstructed, and ensure the system is operating at the recommended water pressure. You may also need to adjust sprinkler head placement or runtime to provide more uniform coverage.