Manhole Rehabilitation

Ensuring the right manhole fixings, materials, covers and frames

Maintain necessary drainage access


Manholes and chambers can, over time, suffer from general deterioration and in particular where there are high levels of Hydrogen Sulphide* or if there are aggressive trade effluent processes e.g. food process wash down. These materials can result in corrosion to both steel and concrete.

Darcy manage all safety processes and provide an internal repair solution to the damaged concrete utilising one of a range of chemically resistant resins and cementitious products to protect the chamber from future attack.

Water Ingress

Groundwater Ingress into manhole chambers and other below ground structures is a potentially serious concern that should be addressed. The Groundwater can be a source of ground contamination that will then enter into a sites drainage and result in pollution and in reverse may result in ground contamination should there be a rise in the drain levels.

Darcy have extensive experience in stopping the ground water through resin injection and specialist application materials and also in completing a water tight repair.

As part of our quality conformance services, Darcy undertake a water test of all manhole repairs to BSEN1610 not only demonstrating our repair but also providing audit evidence.

Covers and Frames

Covers and frames can become damaged through shock, constant loadings and corrosion rendering them seized or simply unsafe. Using the right installation products and suitably fit for purpose quality replacement items, Darcy fit new covers and frames, reinstating the surrounding areas and disposing of all associated spoil.

By using the right fixing, repair materials and quality covers and frames we help to maintain necessary drainage access and keep sites safe.


Confined Spaces such as manholes are extremely dangerous and should never be entered without appropriate approved training, procedures and safety equipment.

*Hydrogen Sulphide (H2S) is one of the dangerous gases found in sewers. The H2S gas is colourless, flammable, poisonous and corrosive, it is noticeable by its rotten egg smell. With toxicity similar to carbon monoxide, monitoring and early detection of H2S could mean the difference between life and death. Only trained personnel should ever enter a manhole it is a Confined Space

Talk to a manhole rehabilitation expert

For further information on our Manhole Rehabilitation service please complete the form opposite or contact us using the details below.