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Attenuation Tank

The construction of a 5800m3 attenuation tank wrapped in 1mm LLDPE and cited within a public open space.

The tank was connected to the existing surface water system by 1800mm diameter concrete pipes and 2700mm diameter concrete manholes with a hydrobrake fitted to the downstream end.

A bulk excavation of approximately 12,000m3 to formation was required prior to installing the tank on a gravel bed interspersed with 150mm dia relief drains.

The tank assembly was inspected regularly by the manufacturer and the adopting authority to ensure compliance to the installation procedures. The LLDPE wrapping was vacuum tested for leaks, prior to the whole tank being very carefully backfilled with suitably selected excavated arisings.

  • CLIENT

    Redrow Homes NW Ltd

  • REFERENCE CONTACT

    White Young Green

  • CONTRACT VALUE

    £380K

  • CONTRACT DETAILS

    Construction of a 5800m3 attenuation tank with interconnecting inflow and outflow large diameter concrete pipes Tank wrapped in 1mm LLDPE and buried 3m beneath a public open space

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