Attenuation tank installation in Wolverhampton

A city on the watershed

Wolverhampton sits on the high ground between two of England's great river systems. Water falling on the west side of the city runs off through the Smestow Brook towards the Stour and the Severn. Water falling on the north and east heads for the Penk and the Tame, and on to the Trent.

That matters for drainage because the receiving watercourses here are close to their sources: small brooks with little capacity to take a sudden surge. Discharge limits on new development reflect that, so most sites need storage behind a flow control, and the tank has to hold water without leaking into the ground around it.

Large sheds along the M54

The M54 corridor north of the city carries large industrial and manufacturing buildings with big roofs and wide yards. A large roof sheds a lot of water quickly, so the storage volumes are large too, and the tank is often split into cells or built as one long block under the yard.

Big tanks reward a disciplined install: the right panel layout, the right number of welds, and connections set out exactly to the drawings. We bring calibrated welding equipment and record a test weld on every job, so the QA pack for a large shed is as complete as for a small one.

Mixed ground, mixed sites

The ground changes across the city, from sandstone on the west side to coal measures and old industrial land to the east. On the eastern side the site investigation often rules out infiltration because of made ground or old workings. Your engineer decides between infiltration and attenuation; if it is attenuation, we build it.

Housing and regeneration closer to the centre brings smaller, tighter tanks under parking courts and estate roads. The method is the same at any size: a checked formation, 300gsm fleece, an impermeable membrane, crates at 95–97% void and sealed connections.

Canal-side and former works sites near the centre can turn up old foundations and buried obstructions during the dig. If the groundworker has had to dig deeper and backfill, we check the formation is firm and level before any membrane goes down.

• Large crate tanks under yards on industrial and logistics sites
• Smaller tanks under parking courts on housing and regeneration schemes
• Supply and install, or install only
• Recorded test weld and handover documentation on every job

Getting there

Our Tamworth base is a straightforward run across to Wolverhampton and out along the M54. We arrive on the day the excavation is ready, check the formation first and tell you straight if it needs more work before we start.