The answer to 'why is my irrigation system' is that there are several common causes for irrigation system issues, including broken or clogged sprinkler heads, leaks in the pipes, issues with the control system, and improper programming. Symptoms can include uneven watering, dry spots, water pooling, and high water bills.
Some potential solutions include inspecting and replacing damaged sprinkler heads, checking for leaks and repairing them, adjusting the control system programming, and ensuring the system is properly zoned and balanced. For more complex issues, it's often best to call in a professional irrigation technician who can properly diagnose and fix the problem.