The aim of this study was to investigate the effect of various factors, including age, diameter, and slope on the prevenance of eight defect categories in the transmission sewer network

Eight categories of defects were identified in 2817 sewer pipes in Auckland, New Zealand based on recent CCTV inspection reports. The correlation between eight defect categories and several physical and

Sewer pipe deterioration is driven by a finite number of root causes and processes. Thus, it should be both feasible and advantageous to have a uniform classification system that can

Sewer pipe deterioration is driven by a finite number of root causes and processes. This work proposes a uniform classification system  for deterioration that can be used for different purposes