Attenuation tank installation
Below-ground attenuation that stores stormwater and releases it at a controlled rate.
Phase 03 · Drainage & utilities
Attenuation tanks hold surface water during heavy rain and release it slowly to the sewer, a watercourse or the ground. They reduce flood risk, protect the drainage network and help developments meet SuDS planning requirements.
Civio assesses water flow, ground conditions and the capacity needed, excavates, installs modular crates or chambers, and connects the tank to the site drainage. Every installation is checked for integrity and capacity before handover.
What’s included
- Site assessment of ground conditions and capacity
- Excavation to the tank formation
- Installation of modular crates or chambers
- Inlet, outlet and flow control connections
- Integration with the site drainage
- Integrity and capacity checks before handover
- Backfill and reinstatement
- Works with
- Sectors
- Residential, commercial, education and healthcare
- Area
- London and the South East
- Taken as
- On its own or within the full package
How we deliver it
One Civio team from first survey to handover.
01
Site assessment and design
We assess water flow, ground conditions and capacity to plan a system that meets SuDS and local authority requirements.
02
Excavation
The tank area is excavated and the formation prepared to the agreed design.
03
Installation and connection
Crates or chambers are installed and connected to the site drainage.
04
Checks and handover
The system is checked for integrity and capacity, then backfilled and reinstated.
Related projects
Bard Pharmaceuticals
Cambridge, CB4 0GW
Groundworks for temporary site accommodation: reduced-level dig, asphalt car park, service diversions, ducting and a reinforced concrete slab.
West Middlesex University Hospital
Isleworth, TW7 6AF
A ground-bearing concrete slab, drainage and external finishes, delivered on a live hospital site in Isleworth.
East Tilbury School
East Tilbury, Essex
Infrastructure for new modular classrooms: pad foundations, drainage, kerbs, footpaths and an asphalt car park.
Common questions
What is an attenuation tank?
A below-ground system, usually modular plastic crates or large chambers, that stores stormwater at peak flow and releases it gradually.
Why do planners ask for attenuation?
To meet SuDS requirements. It limits the rate water leaves the site, so new development does not overload the drainage network.
Can you install the tank within the wider drainage package?
Yes. We install the tank, connect it to the site drainage and reinstate the area as part of the drainage phase.
Request a price
Send drawings, a bill of quantities or a two-line description. Civio prices this service on its own or as part of the full groundworks package.
- Office
- 020 3834 9582
- Mobile
- 07869 083861
- info@civio.co.uk
- Director
- Mitch Kirov, Managing Director