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Table 3

The result of the CCTV inspection

Corrosion
Sagging in vertical direction
Breakage
Cracks
Displaced joints
Infiltration
Extrusion of lateral pipes
ABCABCabcabcabcabcabc

Root intrusion
Attached deposit (mortar)
Others
Total
abcabcabcABCTotalabcTotal

16 24 44     
Corrosion
Sagging in vertical direction
Breakage
Cracks
Displaced joints
Infiltration
Extrusion of lateral pipes
ABCABCabcabcabcabcabc

Root intrusion
Attached deposit (mortar)
Others
Total
abcabcabcABCTotalabcTotal

16 24 44     

Explanation for each level A(a) - C(c) is in Table 4.

Whole length assessment: A = most severe → C = less serious.

Pipe-wise assessment: a = most severe → c = less serious.

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