Contracted to Downer NZ Ltd for SCIRT

July 2011 - September 2015

TDM Construction Ltd was part of the Christchurch rebuild following the 2011 earthquake, repairing the Woolston South 1 Catchment bordering the Heathcote River.

This gravity wastewater system suffered extensive damage with approximately 75% of the catchment requiring replacement.  TDM Construction Ltd's scope of works involved the laying of 150mm, 175mm, 225mm and 300mm diameter PVC pipes at depths ranging from 1m-3.5m. Much of these works were carried out near the Heathcote River which meant considerable dewatering was required to carry out the works.

TDM Construction Ltd was involved in numerous rebuild projects for the next four years, including the major 'PM 11' where 1200mm diameter fibreglass pressure pipes were installed, transporting a large volume of Christchurch's wastewater. 

The unique ground conditions and challenges in Christchurch proved to be invaluable as the team acquired further knowledge, problem solving and technical skills while there. This has been applied throughout subsequent works and training of other employees.


  • Sanitary sewer upgrades
  • Stormwater


"This work was carried out successfully under time, on budget and to a high quality standard ...

(TDM Construction Ltd)  are a very environmentally aware contractor and went above and beyond their normal duties to ensure best environmental practice was adhered to, especially when working in such close proximity to the river. During their time with us they received recognition from SCIRT for their diligence in reporting environmental and safety issues which arose on site.

Overall TDM were a very easy contractor to work with and met or exceeded expectations in dealing with programming and environmental requirements and I would have no hesitation working with them again in the future if the situation arises."

Gearóid Coholan, Project Engineer, Downer NZ Earthquake Team

Read the full testimonial here.