TV surveys involve passing a small camera
through the drains. The operator watches
the picture as the camera progresses, so
that any features can be closely examined
and identified, and a video recording is
usually made for later reference.
A CCTV survey will not determine that a drain
is watertight, but it will show and locate
areas of damage or blockage. A CCTV survey
can also be useful in determining the layout
of a drainage system and identifying unknown
/ abandoned branches.
Drains can be tested and surveyed quite easily
if there are adequate inspection chambers,
and if they are not blocked. However, especially
with older properties, there may be few or
no inspection chambers. In these cases, the
only way to test and survey the drains is
to dig holes and break into the pipes - this
AlphaTotas Structural Engineer Bristol
often find drains are blocked, or are backing
up from overfull cess pits or septic tanks.
In these circumstances, there is little which
can be done until the system has been unblocked,
cleared or emptied - again an expensive operation.
A drainage report would normally include
a plan showing the layout of the drains,
along with details of pipe diameters, depths
below ground, results of water tests, and
findings of CCTV surveys.
AlphaTotas Structural Engineer Bristol engineers
will provide, an estimate for the cost to
visit a property, inspect the drains and
where relevant produce a report. In each
case the price assumes that there is adequate
access to the drains (usually via manhole
covers). Should excavation be required to
gain access, we will usually have an additional
price for this.
Some reports will identify the need for maintenance
or repair work. In each case an indication
of possible cost will usually be noted in