Which method is commonly used for assessing the condition of sewer pipes?

CCTV inspection is the method commonly used for assessing the condition of sewer pipes because it provides a direct visual assessment of the interior of pipes. This technique involves the use of a camera mounted on a rod or crawler that is inserted into the sewer line. The camera transmits live video feeds, allowing operators to observe pipe conditions in real-time, identify blockages, detect structural issues, and assess the overall health of the sewer system.

Using CCTV inspection is advantageous because it provides detailed information on the state of the pipes, including any cracks, corrosion, root intrusion, or other damage that may not be visible through other testing methods. This visual data is crucial for making informed decisions about maintenance, repairs, or replacements in the sewer system. The high resolution and documentation capabilities of CCTV inspections also allow for better planning and prioritization of necessary work.

In comparison, while other methods like visual inspections, sonic testing, and pressure testing can provide useful information, they do not offer the same level of detail and direct observation as CCTV, making it the preferred choice for evaluating sewer pipe conditions.