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drainage a to z

Buchan Trap





These take liquid waste only, usually from waste pipes and storm water pipes. They consist of a grid to stop leaves entering over a hopper which is attached to a ‘u’ bend forming a water trap. The trap is designed to stop smells escaping from the drains.

Inspection Chamber

An inspection chamber offers access to equipment to carry out any drain inspections, but is smaller than a manhole, so offers no access for a drain engineer.

Interceptor Trap

These were bends designed to form a water trap (similar to a U-bend beneath toilets), to stop smells and rodents escaping from the main sewer. They are no longer installed as they attract scale build up and over many years become blocked. The bends forming the trap make effective cleaning impossible and the rodding access bypasses the trap completely.


Similar to drain relining (see below), but used for repairing isolated defects or small damaged areas within a drain, sewer or pipe.

Pitch Fibre

Pipe material that was used in the 1940s to 1970s as a cheaper and lighter alternative to traditional clay pipes. Unfortunately pitch fibre has a life span of 40 years, before it starts collapsing and becoming misshapen. So most pitch fibre has had its time. Depending on the condition, relining may work, but excavation and replacement may be necessary.


Drain relining is a cheaper, quicker way of repairing a drain or sewer. A new pipe is created within the existing one, without the need to excavate. A flexible liner impregnated with resin is pushed through the drain. This is then inflated to mould the resin to the pipe. The liner is heated, and once cooled will mould exactly to the sides of the original pipe.

Rodding Eye

A rodding eye is a small removable cover on a drain pipe that allows access to remove an obstruction using drain rods.

Root Ingress

Roots from trees will infiltrate small cracks or weaknesses in a drain pipe. They will restrict and eventually block the the drain. Root ingress can be removed by use of heavy duty root cutting equipment or high pressure water jetting. Depending on the condition of the drain, once the root ingress has been removed, the existing pipe work can be relined to prevent further root ingress.





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