Structural deterioration of drainage pipes has been
a major concern for asset managers in maintaining
the required performance of the urban drainage
systems. Structural deterioration is the reduction
of physical integrity, which can be characterized
through structural defects such as cracks and
fractures that are identified through condition
assessment. Due to limited budget and the
massive number of pipes, condition assessment
often is carried out on a fraction of the pipe
network using closed circuit television (CCTV)
inspection and a condition grading scheme. The
condition assessment identifies the serviceability
of pipes in a scale from one to three with one
being the perfect, two being the fair and three
being the poor condition.