Table 3

Corrosion . | Sagging in vertical direction . | Breakage . | Cracks . | Displaced joints . | Infiltration . | Extrusion of lateral pipes . | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

A . | B . | C . | A . | B . | C . | a . | b . | c . | a . | b . | c . | a . | b . | c . | a . | b . | c . | a . | b . | c . |

0 | 1 | 2 | 0 | 0 | 0 | 3 | 8 | 6 | 1 | 5 | 8 | 0 | 0 | 3 | 0 | 0 | 1 | 0 | 0 | 1 |

. | . | . | . | . | ||||||||||||||||

Root intrusion . | Attached deposit (mortar) . | Others . | Total . | . | . | . | . | |||||||||||||

a . | b . | c . | a . | b . | c . | a . | b . | c . | A . | B . | C . | Total . | a . | b . | c . | Total . | . | . | . | . |

. | . | . | . | . | ||||||||||||||||

0 | 3 | 0 | 0 | 0 | 4 | 0 | 0 | 1 | 0 | 1 | 2 | 3 | 4 | 16 | 24 | 44 |

Corrosion . | Sagging in vertical direction . | Breakage . | Cracks . | Displaced joints . | Infiltration . | Extrusion of lateral pipes . | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

A . | B . | C . | A . | B . | C . | a . | b . | c . | a . | b . | c . | a . | b . | c . | a . | b . | c . | a . | b . | c . |

0 | 1 | 2 | 0 | 0 | 0 | 3 | 8 | 6 | 1 | 5 | 8 | 0 | 0 | 3 | 0 | 0 | 1 | 0 | 0 | 1 |

. | . | . | . | . | ||||||||||||||||

Root intrusion . | Attached deposit (mortar) . | Others . | Total . | . | . | . | . | |||||||||||||

a . | b . | c . | a . | b . | c . | a . | b . | c . | A . | B . | C . | Total . | a . | b . | c . | Total . | . | . | . | . |

. | . | . | . | . | ||||||||||||||||

0 | 3 | 0 | 0 | 0 | 4 | 0 | 0 | 1 | 0 | 1 | 2 | 3 | 4 | 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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