ATC-0101 · Attenuation
101m³ Stormmaster attenuation tank
A 14m × 6m × 1.2m attenuation tank at Whittingham social club near Preston, built from Stormmaster 40t crates and wrapped in Juta Junifold membrane.
- Location
- Whittingham, Preston
- Region
- Lancashire
- Sector
- Residential
- Completed
- 2026
Attenuation · Whittingham, Preston
101m³
- Ref
- ATC-0101
- Region
- Lancashire
- Sector
- Residential
- Year
- 2026
What we did
300gsm geotextile across the formation, Juta Junifold impermeable membrane welded over it, the Stormmaster 40t crates built to 1.2m, then the full wrap closed over the top and the connections sealed.
The tricky bits
Stormmaster 40t is a crate rated for heavy loading, so the wrap has to sit tight to the block with no loose folds to be pinched when the cover goes on.
What we delivered
A wrapped and sealed 101m³ tank ready for backfill.
The tank
The tank covers 14m by 6m and is 1.2m deep. The Stormmaster 40t crates were built layer by layer inside the lined excavation to the designed volume and loading class, on 300gsm geotextile laid across the formation the groundworks team had prepared.
Testing and handover
The Juta Junifold membrane was heat-welded at every joint. None were taped. A test weld was carried out and recorded before backfill, and the tank was handed over with its weld test record and QA documentation.
- Volume
- 101 m³ (14 × 6 × 1.2m)
- System
- Stormmaster 40t crates
- Membrane
- Juta Junifold, welded
- Geotextile
- 300gsm
On site · Whittingham, Preston
On site
115m³ attenuation tank at a secondary school
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