The answer to 'why is my irrigation system drainage problems' is that there are several common causes, including clogged or damaged drainage pipes, poor soil drainage, and issues with the irrigation system itself. Symptoms may include standing water, wet or soggy soil, and improper irrigation coverage.
Some potential solutions include clearing debris from the drainage system, improving soil drainage through aeration or adding amendments, and adjusting or repairing the irrigation system components. For more complex issues, it's often best to call a professional landscaping or irrigation technician who can properly diagnose and resolve the problem.