The answer to 'why is my irrigation system thin grass' is that your irrigation system may be causing uneven water distribution, leading to thin, patchy grass. This can happen due to issues like clogged or damaged sprinkler heads, incorrect sprinkler placement, or pressure problems in the system.
Some common symptoms include areas of the lawn that are consistently dry or have sparse, discolored grass. The solution often involves inspecting and adjusting your irrigation system to ensure proper coverage and water flow to all areas of the lawn. This may require cleaning or replacing sprinkler heads, adjusting spray patterns, or addressing any leaks or pressure issues in the system.