Laser Surveys

Topographical Surveys, Land Surveys, Building Surveys And Underground Drainage Surveying

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A Practical Guide For Underground Services Location and CCTV Drainage Surveys

CCTV Drainage Surveys

The filming and reporting ( to Water Industry Standards) of drainage systems using colour video camera.
This is not just shoving a camera down a drain and taking a few pictures. We first identify the drainage runs with their pipe sizes, so that the correct camera, and camera set-up is used. The drainage runs are then filmed according to pipe size. As the camera is passed down the sewer its progress is monitored and adjusted in the control van in order to investigate and highlight the faults.

Cameras cost a fortune, and it is essential they are never put in danger and cannot be recovered. Therefore cameras do NOT:
go under water
or drive into any location the operator thinks dangerous
If any of these circumstances occur the survey will be aborted.

Pre Clean: Whether the drainage system is cleaned prior to the CCTV survey is the client’s decision, but we would recommend it for the following reasons.
A. Silt and fat deposits cleaned from the surface of the pipe exposes faults.
B. Larger debris e.g. bricks, concrete etc. are removed if possible thus reducing the risk of the CCTV survey being aborted, and necessitating a return visit with its’ additional cost.
Pre-cleaning can be carried out using either a trailer-mounted jetter or a lorry vactor.
A trailer-mounted jetter will clean the surface of drains up to 225 diameter and move the arisings downstream to the nearest inspection pit - it will NOT remove the arisings or larger deposits such as bricks. A vactor wagon will clean and remove the arisings for most diameter drains.

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Last Updated Monday, August 8, 2005 16:15