What are common symptoms of drainage system failure?

The symptoms of drainage system failure typically manifest through observable issues that indicate a problem with the flow and functionality of the system. Slow drainage is a common sign that indicates blockages or restrictions within the pipes, leading to inefficient water movement. Backups occur when water cannot flow away as intended, resulting in pooling and potential flooding. Foul odors are often a result of stagnant water or decomposing organic material, which can accumulate when the drainage is not working properly. Surface flooding can occur when water overflows due to blockages, causing it to pool above ground. Together, these symptoms provide clear evidence that there are significant issues with the drainage system that require attention.

Options that mention clear water flow, no visible changes, increased insect activity, or fresh grass growth do not indicate drainage system failure. Instead, they may suggest that the drainage system is functioning correctly or in a stable state. Increased insect activity might reflect conditions that can occur for various reasons, including environmental factors, while fresh grass growth over drainage outlets could indicate healthy drainage if it's in the context of appropriate water flow and maintenance.