A CCTV survey lets a drainage engineer see inside the pipe, record its condition and distinguish a temporary blockage from a defect that needs repair.
Short answer: a CCTV drain survey can reveal blockages, cracks, displaced joints, root ingress, scale, deformation, collapse, poorly made connections and other visible defects inside an accessible drain.
A camera is introduced through a suitable access point and moved along the pipe while the operator watches the live image. Smaller lines may be inspected with a pushrod camera. Larger or longer drainage assets may suit a powered crawler system that gives the operator greater control.
The scope should be agreed before the job. Depending on the requirement, the output may include recorded footage, line references, distance observations, defect notes, still images and recommendations. A domestic diagnostic visit may need a simpler output than a commercial asset survey.
A camera can only record what is visible. Heavy silt, grease or scale can obscure the pipe wall. If the objective is condition assessment rather than simply locating a blockage, suitable cleaning before inspection often produces better evidence.
A camera image does not automatically establish ownership, structural calculations, exact ground position or the condition outside the pipe. Distance counters and surface locating can help position a feature, while other investigation may be needed for design or responsibility decisions.
A CCTV survey is especially useful after repeat blockages, before selecting a repair, when purchasing property, after installation or repair, and when building a planned maintenance picture for commercial assets.
The recommendation should match the finding. Options may include no action, routine cleaning, root cutting, local patch lining, further investigation, excavation or pipe replacement. Evidence first helps avoid treating symptoms without addressing the cause.