Transmission Gully - Ecology

Photo of a fish that is effected by construction work for the Transmission Gully Project

Cardno’s ecology team are helping to manage the impacts of a major Wellington road project and are helping the environment thrive into the future.

The Transmission Gully motorway project is a 27km, four-lane motorway featuring four interchanges and two new link roads between Wellington and the lower and central North Island. The motorway will be safer and more reliable for motorists, and better able to resist and recover from earthquakes and storms.  

The project features the most comprehensive package of ecological mitigations ever seen in a New Zealand transport project.  

Cardno was engaged by CPB HEB JV to provide advice to improve the understanding and management of the potential impacts of the project on its surroundings.  

Our ecology specialists are working on location and in partnership with key stakeholders to document the existing environment, fish relocations, stream restoration, biodiversity offsetting and monitoring.  

Photo of aquatic life that is effected by construction work for the Transmission Gully Project

Our work is having an impact with the following examples of action taken:  

  • Identification and mapping of aquatic habitat types impacted by the road alignment 
  • Fish rescue, de-fishing and relocation of rescued fish from impacted waterways 
  • Assessment of fish passage for bridges and culverts 
  • Assessment of ecological impacts on freshwater habitats as a consequence of construction work 
  • Managing biodiversity offsetting for mitigation of freshwater habitat loss affected by construction work  
  • Planning long term mitigation success monitoring as part of the consent requirement. 

The Cardno team is supporting CPB HEB JV to minimise the effects of construction on waterways, offset by a number of environmental improvements that will see harbour water quality improve over time. In less than ten years after the new motorway opens in 2020, the water quality and surrounding environment is expected to be in a better state than before the motorway was built.