Glossary Terms – Greater London Drainage

CAD drainage plan — Scaled CAD drawing of a drainage system showing pipes, chambers and connections.
Cafe kitchen — Smaller commercial food preparation area with reduced grease loads compared to restaurants.
Camera tractor crawler — Self-propelled wheeled or tracked camera used to inspect large diameter sewers.
Car wash — Vehicle washing facility with detergent and silt loads to drain, often via interceptor.
Care home kitchen — Catering kitchen in residential care setting, with infection control and grease management.
Cast iron pipe (drainage) — Heavy ferrous drainage pipe traditional in Victorian London, valued for fire and acoustic performance.
Catchpit — Chamber with a sump that collects silt and debris from drainage flows before the main run.
CCTV drain survey — Camera inspection of drain interiors to locate blockages, cracks and structural defects.
CDM Regulations 2015 — Construction (Design and Management) Regulations setting out health and safety duties on projects.
Cement-lined pipe — Ferrous pipe with internal cement mortar lining to protect against corrosion from waterborne contents.
Cesspit (cesspool) — Sealed underground tank that stores sewage with no treatment until emptied by tanker.
Cesspit emergency overflow — Urgent response to cesspit overflowing due to full sludge or failed lid, requiring tanker emptying.
Cesspit emptying — Removal of accumulated wastewater from a cesspit by vacuum tanker.
Cesspit overflow — Sewage rising from a cesspit because it has reached capacity or its outlet is blocked.
Cesspit replacement — Removal of an old cesspit and installation of a new tank or alternative system.
Chemical spillage drainage — Emergency response to chemical spills entering drainage, requiring containment and reporting.
CIPHE membership — Chartered Institute of Plumbing and Heating Engineering, the UK professional body for plumbing.
CIPP felt liner — Resin-impregnated felt tube cured in place to form a new pipe within the existing drain.
Cistern — Tank holding water above or behind a toilet ready for flushing.
Cistern not filling — Toilet cistern failing to refill after flushing due to inlet valve or water supply problem.
Clay backfill (puddle clay) — Compacted clay used as waterproof backfill around drainage structures and watercourses.
Close-coupled toilet — Toilet with the cistern bolted directly onto the back of the WC pan.
Cockroach infestation in drains — Cockroaches breeding inside drain runs and emerging through fittings or gullies.
Cold-applied sealant — Polyurethane or polysulphide sealant used for cold-applied joint sealing in drainage construction.
Combined drain — Single drain carrying both foul wastewater and surface water rainwater to one sewer.
Combined jet vac unit — Tanker that combines high-pressure jetting and vacuum recovery on one vehicle.
Commercial garage — Vehicle repair or MOT garage with oil interceptor and trade effluent requirements.
Commercial premises — Non-residential property used for business, with trade effluent and commercial drainage rules.
Compression fitting — Pipe joint using a brass nut and olive to compress around the pipe for a watertight seal.
Compression fitting repair — Replacement of a leaking compression fitting on copper or plastic pipework.
Compression spanner — Open-ended or adjustable spanner used to tighten compression fittings.
Concrete pipe — Concrete drainage pipe used historically for larger surface water sewers and stormwater drainage.
Confined space gas monitor — Portable instrument that detects toxic and flammable gases in confined spaces.
Confined space harness — Full body harness used for safe entry and rescue from chambers and wet wells.
Confined Space Regulations 1997 — UK regulations setting out duties and safe systems of work for entry into confined spaces.
Confined space tripod — Frame positioned over a chamber for safe entry, exit and emergency rescue.
Conservation area drain survey — Drain survey adapted to the constraints of working in a designated conservation area.
Conservation Area drainage requirements — Additional drainage controls applying to works in designated UK conservation areas.
Conservation area property — Property within designated Conservation Area where external drainage changes need consent.
Constant running cistern — Toilet cistern that runs continuously due to a failed flush valve or float seal.
Copper pipe — Traditional copper pipe used for hot and cold water supply and historic above ground wastes.
Council drainage records request — Formal request to a local authority for historic drainage records held on file.
Council property — Property owned and managed by a local authority, with council-arranged drainage repairs.
Cracked drain pipe — Linear or circumferential crack in a drain pipe allowing leakage and root ingress.
Crawler camera (CCTV) — Self-propelled CCTV crawler used in larger drains and sewers to record detailed footage.
CSCS card (Construction Skills) — UK construction industry certification card showing site safety and trade qualifications.
Cured-in-place pipe (CIPP) — Resin-impregnated liner installed inside a damaged pipe and cured to form a new pipe.

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