Access was one of the project’s biggest challenges. The work area was located within a tight stream bed, with limited space for machinery, materials and safe movement around the site. To overcome this, Kūmānu constructed a crane platform on the adjacent cycleway, allowing materials to be safely lifted into position. A temporary access ramp was also formed to enable machinery to enter and exit the stream bed safely.

Working within the stream environment required careful environmental management, water management and erosion and sediment control throughout construction. Controls were implemented to prevent dirty water discharge and ensure compliance with resource consent conditions. The team also managed environmental requirements, including the relocation of aquatic life through electric fishing prior to construction, along with fish habitat reinstatement within the work area once construction was complete.

A key component of the project involved ground anchoring works in extremely difficult ground conditions. Ground Anchor Systems provided specialist technical input and drilling capability, successfully installing anchors to depths of up to 5 metres despite the challenging geology encountered on site.

The project demonstrates Kūmānu’s ability to deliver technically challenging waterway works and erosion control projects in constrained environments, while managing design development, difficult access, environmental protection, consent compliance, subcontractor coordination and site reinstatement requirements.