Otahuhu East Branch Sewer

Otahuhu East Branch Sewer

Watercare Services Ltd

Location: Auckland, New Zealand
Value: $1M +
Completed: 2011


The project involved the installation by directional drilling of a twin siphon (250OD & 200OD HDPE) pipelines under the Tamaki Estuary, construction by microtunnelling of a 300NB pipeline and associated precast and insitu concrete chambers.

A new pipe bridge spanning 60m across the Tamaki Estuary required construction of a temporary working platform across the mangroves to provide access for piling rigs and pipe installation.


  • Insitu concrete chamber construction
  • directional drilling (siphon)
  • microtunnelling
  • HDPE welding
  • piling
  • drainage