The Tawa Reservoir in Wellington, a 24‑metre‑diameter concrete water tank with a domed roof, required major remediation due to advanced deterioration and persistent leakage. The structure also needed seismic strengthening to restore performance and ensure long‑term reliability.

The original scope included FRP strengthening, a new overlay slab, roof topping works, and comprehensive waterproofing. Following the significant 2016 seismic event, the programmed was revised to remove the FRP component and expand the required works. The final delivery focused on installing the overlay slab, applying full waterproofing systems, repairing steel pipework, and upgrading handrails to enhance safety and durability.

  • Customer/Owner:
    Wellington Water
  • Engineer
    Aecom/Beca/Opus
  • Works period
    October 2016 - January 2018

Freyssinet Scope

  • Seismic strengthening works (revised following the Nov‑16 earthquake event)
  • Construction of a new overlay concrete slab
  • Installation of roof topping and new safety handrails
  • Application of waterproofing systems to the roof and internal reservoir walls
  • Remediation and refurbishment of existing steel pipework
  • Self‑performed delivery of all works except the overlay slab (subcontracted)
  • Full project management, safety planning, and quality control by Freyssinet as Principal Contractor
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