(1) Observation method
Observe whether the pipeline is blocked by observing the water level in the same pipeline. Observe the water quality in the well, such as the normal rainwater in the upstream well, and the yellow muddy water in the downstream well, indicating that there is a break in the middle of the pipeline. Collapse.
(2) Diving inspection method
It is a method for observing and judging whether the pipeline is blocked or misplaced by the diver's hand touching the inner wall of the pipeline. The above method has certain blindness, not only high cost, but also can not correctly and systematically evaluate the condition inside the pipeline, and cannot meet the requirements of modern digital municipal management.
(3) Mirror method
The sunlight is refracted into the pipeline through the mirror to observe the blockage and misalignment of the pipeline.
(4) Measuring mud bucket detection method
Determine whether the pipeline drainage function is normal by detecting the thickness of sludge and sand in the nozzle or shaft.
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