Fractured
Pipework |
 |
Most
drainage systems over 20 years old are constructed from earthenware
pipework which is susceptible to fracturing, leading to the
escape of water in the surrounding ground area.
This can cause deterioration of the system and lead to further
more serious structural damage. In turn the egress of water
can affect the structural stability of nearby buildings. |
 |
Collapsed
Pipework |
| Collapsing drainage usually occurs after
excessive pressure from above or as deterioration of lesser
damage and the resultant water loss. The broken drainage can
cause frequent blockages and disrupt the use of a system.
The continual loss of water into the ground can lead to subsidence. |
Root
Damage |
 |
Roots
can either cause damage to a drainage system in the form
of broken pipework or be the result of root growth in the
vicinity of an existing drainage problem. Typically the
roots cause frequent blockages and generally continue to
attack the pipework if left unchecked. |
 |
Deformed
Pipework |
| During the 1960's a new pipe material called
pitch fibre was commonly used. This was subsequently found
to be inherently defective, with the pipework becoming deformed
and delaminated and the resulting 'squashing' causing frequent
blockages. When the deterioration has progressed insitu repairs
may not be possible. |
