City Rail Link – Britomart Station to North Auckland Line

Client: Auckland Transport
Date: 2011 – present

The City Rail Link (CRL) comprised two ~3.4 km underground rail lines linking the downtown Britomart Station to the city centre and then connecting to existing commuter rail lines near Mt Eden.  Auckland Transport has identified the CRL connection as the top transport priority for Auckland City.  Along with the construction of the underground tunnels, two new underground stations will be built; near Aotea Square (mid-town) and Karangahape Rd (up-town).  The connection will allow the movement of ~30,000 people per hour.

We were engaged to complete the required groundwater investigations, modelling and analysis, and groundwater-related technical effects assessment reporting for the consent applications.  The project included stringent technical and regulatory review, as well as tight timeframes and an active urban-area working environment.  We planned and managed the completion of a 28-day pumping test, to provide real data for analysis and prediction of long-term dewatering effects.  Data collected from this test, and another short term testing, was used to calibrate the 3D and 2D numerical groundwater models developed for the various underground stations and tunnels.

Resource consents for the stations and tunnels have been granted for the entire alignment, and construction has commenced.  We are continuing work on other resource consents related to the diversion of existing services to make way for the underground rail.

Key Aspects:

  • Large scale intrusive investigations, hydraulic testing & monitoring network
  • 3D transient numerical groundwater modelling (MODFLOW)
  • Technical effects assessment reporting
  • Regulator negotiation
  • Evidence presentation and consent condition advice

Client: Auckland Transport
Date: 2011 – present

Modelled drawdown from one of the construction assessment scenarios for Karangahape Station

Conducting survey of Myers Park manholes to locate the former Waihorotiu Stream which was historically diverted into the storm water network

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